Vulnerabilities
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Show issues fixed only in OpenSSL 3.3, 3.2, 3.1, 3.0, 1.1.1, 1.1.0, 1.0.2, 1.0.1, 1.0.0, 0.9.8, 0.9.7, 0.9.6, or all versions
Fixed in OpenSSL 1.0.1
OpenSSL 1.0.1 is out of support since 1st January 2017 and no longer receiving updates.
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2016
- CVE-2016-6304 (OpenSSL Advisory) [High severity] 22 September 2016:
- A malicious client can send an excessively large OCSP Status Request extension. If that client continually requests renegotiation, sending a large OCSP Status Request extension each time, then there will be unbounded memory growth on the server. This will eventually lead to a Denial Of Service attack through memory exhaustion. Servers with a default configuration are vulnerable even if they do not support OCSP. Builds using the "no-ocsp" build time option are not affected. Servers using OpenSSL versions prior to 1.0.1g are not vulnerable in a default configuration, instead only if an application explicitly enables OCSP stapling support.
- Found by Shi Lei (Gear Team, Qihoo 360 Inc.).
- Fixed in OpenSSL 1.0.1u (git commit) (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i, OpenSSL 1.1.0a
- CVE-2016-6306 (OpenSSL Advisory) [Low severity] 21 September 2016:
- In OpenSSL 1.0.2 and earlier some missing message length checks can result in OOB reads of up to 2 bytes beyond an allocated buffer. There is a theoretical DoS risk but this has not been observed in practice on common platforms. The messages affected are client certificate, client certificate request and server certificate. As a result the attack can only be performed against a client or a server which enables client authentication.
- Found by Shi Lei (Gear Team, Qihoo 360 Inc.).
- Fixed in OpenSSL 1.0.1u (git commit) (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i
- CVE-2016-6303 (OpenSSL Advisory) [Low severity] 24 August 2016:
- An overflow can occur in MDC2_Update() either if called directly or through the EVP_DigestUpdate() function using MDC2. If an attacker is able to supply very large amounts of input data after a previous call to EVP_EncryptUpdate() with a partial block then a length check can overflow resulting in a heap corruption. The amount of data needed is comparable to SIZE_MAX which is impractical on most platforms.
- Found by Shi Lei (Gear Team, Qihoo 360 Inc.).
- Fixed in OpenSSL 1.0.1u (git commit) (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i
- CVE-2016-6302 (OpenSSL Advisory) [Low severity] 23 August 2016:
- If a server uses SHA512 for TLS session ticket HMAC it is vulnerable to a DoS attack where a malformed ticket will result in an OOB read which will ultimately crash. The use of SHA512 in TLS session tickets is comparatively rare as it requires a custom server callback and ticket lookup mechanism.
- Found by Shi Lei (Gear Team, Qihoo 360 Inc.).
- Fixed in OpenSSL 1.0.1u (git commit) (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i
- CVE-2016-2179 (OpenSSL Advisory) [Low severity] 22 August 2016:
- In a DTLS connection where handshake messages are delivered out-of-order those messages that OpenSSL is not yet ready to process will be buffered for later use. Under certain circumstances, a flaw in the logic means that those messages do not get removed from the buffer even though the handshake has been completed. An attacker could force up to approx. 15 messages to remain in the buffer when they are no longer required. These messages will be cleared when the DTLS connection is closed. The default maximum size for a message is 100k. Therefore the attacker could force an additional 1500k to be consumed per connection. By opening many simulataneous connections an attacker could cause a DoS attack through memory exhaustion.
- Found by Quan Luo.
- Fixed in OpenSSL 1.0.1u (git commit) (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i
- CVE-2016-2181 (OpenSSL Advisory) [Low severity] 19 August 2016:
- A flaw in the DTLS replay attack protection mechanism means that records that arrive for future epochs update the replay protection "window" before the MAC for the record has been validated. This could be exploited by an attacker by sending a record for the next epoch (which does not have to decrypt or have a valid MAC), with a very large sequence number. This means that all subsequent legitimate packets are dropped causing a denial of service for a specific DTLS connection.
- Found by OCAP audit team.
- Fixed in OpenSSL 1.0.1u (git commit) (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i
- CVE-2016-2182 (OpenSSL Advisory) [Low severity] 16 August 2016:
- The function BN_bn2dec() does not check the return value of BN_div_word(). This can cause an OOB write if an application uses this function with an overly large BIGNUM. This could be a problem if an overly large certificate or CRL is printed out from an untrusted source. TLS is not affected because record limits will reject an oversized certificate before it is parsed.
- Found by Shi Lei (Gear Team, Qihoo 360 Inc.).
- Fixed in OpenSSL 1.0.1u (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i
- CVE-2016-2180 (OpenSSL Advisory) [Low severity] 22 July 2016:
- The function TS_OBJ_print_bio() misuses OBJ_obj2txt(): the return value is the total length the OID text representation would use and not the amount of data written. This will result in OOB reads when large OIDs are presented.
- Found by Shi Lei (Gear Team, Qihoo 360 Inc.).
- Fixed in OpenSSL 1.0.1u (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i
- CVE-2016-2178 (OpenSSL Advisory) [Low severity] 07 June 2016:
- Operations in the DSA signing algorithm should run in constant time in order to avoid side channel attacks. A flaw in the OpenSSL DSA implementation means that a non-constant time codepath is followed for certain operations. This has been demonstrated through a cache-timing attack to be sufficient for an attacker to recover the private DSA key.
- Found by César Pereida (Aalto University), Billy Brumley (Tampere University of Technology), and Yuval Yarom (The University of Adelaide and NICTA).
- Fixed in OpenSSL 1.0.1u (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i
- CVE-2016-2177 (OpenSSL Advisory) [Low severity] 01 June 2016:
- Avoid some undefined pointer arithmetic A common idiom in the codebase is to check limits in the following manner: "p + len > limit" Where "p" points to some malloc'd data of SIZE bytes and limit == p + SIZE "len" here could be from some externally supplied data (e.g. from a TLS message). The rules of C pointer arithmetic are such that "p + len" is only well defined where len <= SIZE. Therefore the above idiom is actually undefined behaviour. For example this could cause problems if some malloc implementation provides an address for "p" such that "p + len" actually overflows for values of len that are too big and therefore p + len < limit.
- Found by Guido Vranken.
- Fixed in OpenSSL 1.0.1u (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2i
- CVE-2016-2176 (OpenSSL Advisory) [Low severity] 03 May 2016:
- ASN1 Strings that are over 1024 bytes can cause an overread in applications using the X509_NAME_oneline() function on EBCDIC systems. This could result in arbitrary stack data being returned in the buffer.
- Found by Guido Vranken.
- Fixed in OpenSSL 1.0.1t (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2h
- CVE-2016-2109 (OpenSSL Advisory) [Low severity] 03 May 2016:
- When ASN.1 data is read from a BIO using functions such as d2i_CMS_bio() a short invalid encoding can casuse allocation of large amounts of memory potentially consuming excessive resources or exhausting memory. Any application parsing untrusted data through d2i BIO functions is affected. The memory based functions such as d2i_X509() are *not* affected. Since the memory based functions are used by the TLS library, TLS applications are not affected.
- Found by Brian Carpenter.
- Fixed in OpenSSL 1.0.1t (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2h
- CVE-2016-2108 (OpenSSL Advisory) [High severity] 03 May 2016:
- This issue affected versions of OpenSSL prior to April 2015. The bug causing the vulnerability was fixed on April 18th 2015, and released as part of the June 11th 2015 security releases. The security impact of the bug was not known at the time. In previous versions of OpenSSL, ASN.1 encoding the value zero represented as a negative integer can cause a buffer underflow with an out-of-bounds write in i2c_ASN1_INTEGER. The ASN.1 parser does not normally create "negative zeroes" when parsing ASN.1 input, and therefore, an attacker cannot trigger this bug. However, a second, independent bug revealed that the ASN.1 parser (specifically, d2i_ASN1_TYPE) can misinterpret a large universal tag as a negative zero value. Large universal tags are not present in any common ASN.1 structures (such as X509) but are accepted as part of ANY structures. Therefore, if an application deserializes untrusted ASN.1 structures containing an ANY field, and later reserializes them, an attacker may be able to trigger an out-of-bounds write. This has been shown to cause memory corruption that is potentially exploitable with some malloc implementations. Applications that parse and re-encode X509 certificates are known to be vulnerable. Applications that verify RSA signatures on X509 certificates may also be vulnerable; however, only certificates with valid signatures trigger ASN.1 re-encoding and hence the bug. Specifically, since OpenSSL's default TLS X509 chain verification code verifies the certificate chain from root to leaf, TLS handshakes could only be targeted with valid certificates issued by trusted Certification Authorities.
- Found by Huzaifa Sidhpurwala (Red Hat), Hanno Böck, David Benjamin (Google).
- Fixed in OpenSSL 1.0.1o (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2c
- CVE-2016-2107 (OpenSSL Advisory) [High severity] 03 May 2016:
- A MITM attacker can use a padding oracle attack to decrypt traffic when the connection uses an AES CBC cipher and the server support AES-NI. This issue was introduced as part of the fix for Lucky 13 padding attack (CVE-2013-0169). The padding check was rewritten to be in constant time by making sure that always the same bytes are read and compared against either the MAC or padding bytes. But it no longer checked that there was enough data to have both the MAC and padding bytes.
- Found by Juraj Somorovsky.
- Fixed in OpenSSL 1.0.1t (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2h
- CVE-2016-2106 (OpenSSL Advisory) [Low severity] 03 May 2016:
- An overflow can occur in the EVP_EncryptUpdate() function. If an attacker is able to supply very large amounts of input data after a previous call to EVP_EncryptUpdate() with a partial block then a length check can overflow resulting in a heap corruption. Following an analysis of all OpenSSL internal usage of the EVP_EncryptUpdate() function all usage is one of two forms. The first form is where the EVP_EncryptUpdate() call is known to be the first called function after an EVP_EncryptInit(), and therefore that specific call must be safe. The second form is where the length passed to EVP_EncryptUpdate() can be seen from the code to be some small value and therefore there is no possibility of an overflow. Since all instances are one of these two forms, it is believed that there can be no overflows in internal code due to this problem. It should be noted that EVP_DecryptUpdate() can call EVP_EncryptUpdate() in certain code paths. Also EVP_CipherUpdate() is a synonym for EVP_EncryptUpdate(). All instances of these calls have also been analysed too and it is believed there are no instances in internal usage where an overflow could occur. This could still represent a security issue for end user code that calls this function directly.
- Found by Guido Vranken.
- Fixed in OpenSSL 1.0.1t (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2h
- CVE-2016-2105 (OpenSSL Advisory) [Low severity] 03 May 2016:
- An overflow can occur in the EVP_EncodeUpdate() function which is used for Base64 encoding of binary data. If an attacker is able to supply very large amounts of input data then a length check can overflow resulting in a heap corruption. Internally to OpenSSL the EVP_EncodeUpdate() function is primarly used by the PEM_write_bio* family of functions. These are mainly used within the OpenSSL command line applications. These internal uses are not considered vulnerable because all calls are bounded with length checks so no overflow is possible. User applications that call these APIs directly with large amounts of untrusted data may be vulnerable. (Note: Initial analysis suggested that the PEM_write_bio* were vulnerable, and this is reflected in the patch commit message. This is no longer believed to be the case).
- Found by Guido Vranken.
- Fixed in OpenSSL 1.0.1t (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2h
- CVE-2016-0800 (OpenSSL Advisory) [High severity] 01 March 2016:
- A cross-protocol attack was discovered that could lead to decryption of TLS sessions by using a server supporting SSLv2 and EXPORT cipher suites as a Bleichenbacher RSA padding oracle. Note that traffic between clients and non-vulnerable servers can be decrypted provided another server supporting SSLv2 and EXPORT ciphers (even with a different protocol such as SMTP, IMAP or POP) shares the RSA keys of the non-vulnerable server. This vulnerability is known as DROWN (CVE-2016-0800). Recovering one session key requires the attacker to perform approximately 2^50 computation, as well as thousands of connections to the affected server. A more efficient variant of the DROWN attack exists against unpatched OpenSSL servers using versions that predate 1.0.2a, 1.0.1m, 1.0.0r and 0.9.8zf released on 19/Mar/2015 (see CVE-2016-0703 below). Users can avoid this issue by disabling the SSLv2 protocol in all their SSL/TLS servers, if they've not done so already. Disabling all SSLv2 ciphers is also sufficient, provided the patches for CVE-2015-3197 (fixed in OpenSSL 1.0.1r and 1.0.2f) have been deployed. Servers that have not disabled the SSLv2 protocol, and are not patched for CVE-2015-3197 are vulnerable to DROWN even if all SSLv2 ciphers are nominally disabled, because malicious clients can force the use of SSLv2 with EXPORT ciphers. OpenSSL 1.0.2g and 1.0.1s deploy the following mitigation against DROWN: SSLv2 is now by default disabled at build-time. Builds that are not configured with "enable-ssl2" will not support SSLv2. Even if "enable-ssl2" is used, users who want to negotiate SSLv2 via the version-flexible SSLv23_method() will need to explicitly call either of: SSL_CTX_clear_options(ctx, SSL_OP_NO_SSLv2); or SSL_clear_options(ssl, SSL_OP_NO_SSLv2); as appropriate. Even if either of those is used, or the application explicitly uses the version-specific SSLv2_method() or its client or server variants, SSLv2 ciphers vulnerable to exhaustive search key recovery have been removed. Specifically, the SSLv2 40-bit EXPORT ciphers, and SSLv2 56-bit DES are no longer available. In addition, weak ciphers in SSLv3 and up are now disabled in default builds of OpenSSL. Builds that are not configured with "enable-weak-ssl-ciphers" will not provide any "EXPORT" or "LOW" strength ciphers.
- Found by Nimrod Aviram and Sebastian Schinzel.
- Fixed in OpenSSL 1.0.1s (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2g
- CVE-2016-0799 (OpenSSL Advisory) [Low severity] 01 March 2016:
- The internal |fmtstr| function used in processing a "%s" format string in the BIO_*printf functions could overflow while calculating the length of a string and cause an OOB read when printing very long strings. Additionally the internal |doapr_outch| function can attempt to write to an OOB memory location (at an offset from the NULL pointer) in the event of a memory allocation failure. In 1.0.2 and below this could be caused where the size of a buffer to be allocated is greater than INT_MAX. E.g. this could be in processing a very long "%s" format string. Memory leaks can also occur. The first issue may mask the second issue dependent on compiler behaviour. These problems could enable attacks where large amounts of untrusted data is passed to the BIO_*printf functions. If applications use these functions in this way then they could be vulnerable. OpenSSL itself uses these functions when printing out human-readable dumps of ASN.1 data. Therefore applications that print this data could be vulnerable if the data is from untrusted sources. OpenSSL command line applications could also be vulnerable where they print out ASN.1 data, or if untrusted data is passed as command line arguments. Libssl is not considered directly vulnerable. Additionally certificates etc received via remote connections via libssl are also unlikely to be able to trigger these issues because of message size limits enforced within libssl.
- Found by Guido Vranken.
- Fixed in OpenSSL 1.0.1s (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2g
- CVE-2016-0798 (OpenSSL Advisory) [Low severity] 01 March 2016:
- The SRP user database lookup method SRP_VBASE_get_by_user had confusing memory management semantics; the returned pointer was sometimes newly allocated, and sometimes owned by the callee. The calling code has no way of distinguishing these two cases. Specifically, SRP servers that configure a secret seed to hide valid login information are vulnerable to a memory leak: an attacker connecting with an invalid username can cause a memory leak of around 300 bytes per connection. Servers that do not configure SRP, or configure SRP but do not configure a seed are not vulnerable. In Apache, the seed directive is known as SSLSRPUnknownUserSeed. To mitigate the memory leak, the seed handling in SRP_VBASE_get_by_user is now disabled even if the user has configured a seed. Applications are advised to migrate to SRP_VBASE_get1_by_user. However, note that OpenSSL makes no strong guarantees about the indistinguishability of valid and invalid logins. In particular, computations are currently not carried out in constant time.
- Found by Emilia Käsper (OpenSSL).
- Fixed in OpenSSL 1.0.1s (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2g
- CVE-2016-0797 (OpenSSL Advisory) [Low severity] 01 March 2016:
- In the BN_hex2bn function the number of hex digits is calculated using an int value |i|. Later |bn_expand| is called with a value of |i * 4|. For large values of |i| this can result in |bn_expand| not allocating any memory because |i * 4| is negative. This can leave the internal BIGNUM data field as NULL leading to a subsequent NULL ptr deref. For very large values of |i|, the calculation |i * 4| could be a positive value smaller than |i|. In this case memory is allocated to the internal BIGNUM data field, but it is insufficiently sized leading to heap corruption. A similar issue exists in BN_dec2bn. This could have security consequences if BN_hex2bn/BN_dec2bn is ever called by user applications with very large untrusted hex/dec data. This is anticipated to be a rare occurrence. All OpenSSL internal usage of these functions use data that is not expected to be untrusted, e.g. config file data or application command line arguments. If user developed applications generate config file data based on untrusted data then it is possible that this could also lead to security consequences. This is also anticipated to be rare.
- Found by Guido Vranken.
- Fixed in OpenSSL 1.0.1s (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2g
- CVE-2016-0705 (OpenSSL Advisory) [Low severity] 01 March 2016:
- A double free bug was discovered when OpenSSL parses malformed DSA private keys and could lead to a DoS attack or memory corruption for applications that receive DSA private keys from untrusted sources. This scenario is considered rare.
- Found by Adam Langley (Google/BoringSSL).
- Fixed in OpenSSL 1.0.1s (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2g
- CVE-2016-0704 (OpenSSL Advisory) [Moderate severity] 01 March 2016:
- This issue only affected versions of OpenSSL prior to March 19th 2015 at which time the code was refactored to address the vulnerability CVE-2015-0293. s2_srvr.c overwrite the wrong bytes in the master-key when applying Bleichenbacher protection for export cipher suites. This provides a Bleichenbacher oracle, and could potentially allow more efficient variants of the DROWN attack.
- Found by David Adrian and J.Alex Halderman (University of Michigan).
- CVE-2016-0703 (OpenSSL Advisory) [High severity] 01 March 2016:
- This issue only affected versions of OpenSSL prior to March 19th 2015 at which time the code was refactored to address vulnerability CVE-2015-0293. s2_srvr.c did not enforce that clear-key-length is 0 for non-export ciphers. If clear-key bytes are present for these ciphers, they *displace* encrypted-key bytes. This leads to an efficient divide-and-conquer key recovery attack: if an eavesdropper has intercepted an SSLv2 handshake, they can use the server as an oracle to determine the SSLv2 master-key, using only 16 connections to the server and negligible computation. More importantly, this leads to a more efficient version of DROWN that is effective against non-export ciphersuites, and requires no significant computation.
- Found by David Adrian and J.Alex Halderman (University of Michigan).
- CVE-2016-0702 (OpenSSL Advisory) [Low severity] 01 March 2016:
- A side-channel attack was found which makes use of cache-bank conflicts on the Intel Sandy-Bridge microarchitecture which could lead to the recovery of RSA keys. The ability to exploit this issue is limited as it relies on an attacker who has control of code in a thread running on the same hyper-threaded core as the victim thread which is performing decryptions.
- Found by Yuval Yarom, The University of Adelaide and NICTA, Daniel Genkin, Technion and Tel Aviv University, and Nadia Heninger, University of Pennsylvania.
- Fixed in OpenSSL 1.0.1s (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2g
- CVE-2015-3197 (OpenSSL Advisory) [Low severity] 28 January 2016:
- A malicious client can negotiate SSLv2 ciphers that have been disabled on the server and complete SSLv2 handshakes even if all SSLv2 ciphers have been disabled, provided that the SSLv2 protocol was not also disabled via SSL_OP_NO_SSLv2.
- Found by Nimrod Aviram and Sebastian Schinzel.
- Fixed in OpenSSL 1.0.1r (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2f
2015
- CVE-2015-3196 (OpenSSL Advisory) [Low severity] 03 December 2015:
- If PSK identity hints are received by a multi-threaded client then the values are wrongly updated in the parent SSL_CTX structure. This can result in a race condition potentially leading to a double free of the identify hint data.
- Found by Stephen Henson (OpenSSL).
- CVE-2015-3195 (OpenSSL Advisory) [Moderate severity] 03 December 2015:
- When presented with a malformed X509_ATTRIBUTE structure OpenSSL will leak memory. This structure is used by the PKCS#7 and CMS routines so any application which reads PKCS#7 or CMS data from untrusted sources is affected. SSL/TLS is not affected.
- Found by Adam Langley (Google/BoringSSL) using libFuzzer.
- CVE-2015-3194 (OpenSSL Advisory) [Moderate severity] 03 December 2015:
- The signature verification routines will crash with a NULL pointer dereference if presented with an ASN.1 signature using the RSA PSS algorithm and absent mask generation function parameter. Since these routines are used to verify certificate signature algorithms this can be used to crash any certificate verification operation and exploited in a DoS attack. Any application which performs certificate verification is vulnerable including OpenSSL clients and servers which enable client authentication.
- Found by Loïc Jonas Etienne (Qnective AG).
- Fixed in OpenSSL 1.0.1q (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.2e
- CVE-2015-1793 (OpenSSL Advisory) [High severity] 09 July 2015:
- An error in the implementation of the alternative certificate chain logic could allow an attacker to cause certain checks on untrusted certificates to be bypassed, such as the CA flag, enabling them to use a valid leaf certificate to act as a CA and "issue" an invalid certificate.
- Found by Adam Langley and David Benjamin (Google/BoringSSL).
- Fixed in OpenSSL 1.0.1p (Affected since 1.0.1n)
- This issue was also addressed in OpenSSL 1.0.2d
- CVE-2015-1792 (OpenSSL Advisory) [Moderate severity] 11 June 2015:
- When verifying a signedData message the CMS code can enter an infinite loop if presented with an unknown hash function OID. This can be used to perform denial of service against any system which verifies signedData messages using the CMS code.
- Found by Johannes Bauer.
- CVE-2015-1790 (OpenSSL Advisory) [Moderate severity] 11 June 2015:
- The PKCS#7 parsing code does not handle missing inner EncryptedContent correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with missing content and trigger a NULL pointer dereference on parsing. Applications that decrypt PKCS#7 data or otherwise parse PKCS#7 structures from untrusted sources are affected. OpenSSL clients and servers are not affected.
- Found by Michal Zalewski (Google).
- CVE-2015-1789 (OpenSSL Advisory) [Moderate severity] 11 June 2015:
- X509_cmp_time does not properly check the length of the ASN1_TIME string and can read a few bytes out of bounds. In addition, X509_cmp_time accepts an arbitrary number of fractional seconds in the time string. An attacker can use this to craft malformed certificates and CRLs of various sizes and potentially cause a segmentation fault, resulting in a DoS on applications that verify certificates or CRLs. TLS clients that verify CRLs are affected. TLS clients and servers with client authentication enabled may be affected if they use custom verification callbacks.
- Found by Robert Święcki (Google Security Team). Found by Hanno Böck.
- CVE-2015-1788 (OpenSSL Advisory) [Moderate severity] 11 June 2015:
- When processing an ECParameters structure OpenSSL enters an infinite loop if the curve specified is over a specially malformed binary polynomial field. This can be used to perform denial of service against any system which processes public keys, certificate requests or certificates. This includes TLS clients and TLS servers with client authentication enabled.
- Found by Joseph Birr-Pixton.
- CVE-2014-8176 (OpenSSL Advisory) [Moderate severity] 11 June 2015:
- This vulnerability does not affect current versions of OpenSSL. It existed in previous OpenSSL versions and was fixed in June 2014. If a DTLS peer receives application data between the ChangeCipherSpec and Finished messages, buffering of such data may cause an invalid free, resulting in a segmentation fault or potentially, memory corruption.
- Found by Praveen Kariyanahalli, and subsequently by Ivan Fratric and Felix Groebert (Google).
- CVE-2015-1791 (OpenSSL Advisory) [Low severity] 02 June 2015:
- If a NewSessionTicket is received by a multi-threaded client when attempting to reuse a previous ticket then a race condition can occur potentially leading to a double free of the ticket data.
- Found by Emilia Käsper (OpenSSL).
- CVE-2015-0293 (OpenSSL Advisory) [Moderate severity] 19 March 2015:
- DoS via reachable assert in SSLv2 servers. A malicious client can trigger an OPENSSL_assert in servers that both support SSLv2 and enable export cipher suites by sending a specially crafted SSLv2 CLIENT-MASTER-KEY message.
- Found by Sean Burford (Google) and Emilia Käsper (OpenSSL development team).
- CVE-2015-0292 (OpenSSL Advisory) [Moderate severity] 19 March 2015:
- A vulnerability existed in previous versions of OpenSSL related to the processing of base64 encoded data. Any code path that reads base64 data from an untrusted source could be affected (such as the PEM processing routines). Maliciously crafted base 64 data could trigger a segmenation fault or memory corruption.
- Found by Robert Dugal, also David Ramos, also Huzaifa Sidhpurwala (Red Hat).
- CVE-2015-0289 (OpenSSL Advisory) [Moderate severity] 19 March 2015:
- PKCS#7 NULL pointer dereference. The PKCS#7 parsing code does not handle missing outer ContentInfo correctly. An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with missing content and trigger a NULL pointer dereference on parsing. Applications that verify PKCS#7 signatures, decrypt PKCS#7 data or otherwise parse PKCS#7 structures from untrusted sources are affected. OpenSSL clients and servers are not affected.
- Found by Michal Zalewski (Google).
- CVE-2015-0287 (OpenSSL Advisory) [Moderate severity] 19 March 2015:
- ASN.1 structure reuse memory corruption. Reusing a structure in ASN.1 parsing may allow an attacker to cause memory corruption via an invalid write. Such reuse is and has been strongly discouraged and is believed to be rare.
- Found by Emilia Käsper (OpenSSL development team).
- CVE-2015-0286 (OpenSSL Advisory) [Moderate severity] 19 March 2015:
- Segmentation fault in ASN1_TYPE_cmp. The function ASN1_TYPE_cmp will crash with an invalid read if an attempt is made to compare ASN.1 boolean types. Since ASN1_TYPE_cmp is used to check certificate signature algorithm consistency this can be used to crash any certificate verification operation and exploited in a DoS attack. Any application which performs certificate verification is vulnerable including OpenSSL clients and servers which enable client authentication.
- Found by Stephen Henson (OpenSSL development team).
- CVE-2015-0209 (OpenSSL Advisory) [Low severity] 19 March 2015:
- Use After Free following d2i_ECPrivatekey error. A malformed EC private key file consumed via the d2i_ECPrivateKey function could cause a use after free condition. This, in turn, could cause a double free in several private key parsing functions (such as d2i_PrivateKey or EVP_PKCS82PKEY) and could lead to a DoS attack or memory corruption for applications that receive EC private keys from untrusted sources. This scenario is considered rare.
- Found by The BoringSSL project.
- CVE-2015-0288 (OpenSSL Advisory) [Low severity] 02 March 2015:
- X509_to_X509_REQ NULL pointer deref. The function X509_to_X509_REQ will crash with a NULL pointer dereference if the certificate key is invalid. This function is rarely used in practice.
- Found by Brian Carpenter.
- CVE-2015-0206 (OpenSSL Advisory) [Moderate severity] 08 January 2015:
- A memory leak can occur in the dtls1_buffer_record function under certain conditions. In particular this could occur if an attacker sent repeated DTLS records with the same sequence number but for the next epoch. The memory leak could be exploited by an attacker in a Denial of Service attack through memory exhaustion.
- Found by Chris Mueller.
- Fixed in OpenSSL 1.0.1k (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.0p
- CVE-2015-0205 (OpenSSL Advisory) [Low severity] 08 January 2015:
- An OpenSSL server will accept a DH certificate for client authentication without the certificate verify message. This effectively allows a client to authenticate without the use of a private key. This only affects servers which trust a client certificate authority which issues certificates containing DH keys: these are extremely rare and hardly ever encountered.
- Found by Karthikeyan Bhargavan of the PROSECCO team at INRIA.
- Fixed in OpenSSL 1.0.1k (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.0p
- CVE-2014-3570 (OpenSSL Advisory) [Low severity] 08 January 2015:
- Bignum squaring (BN_sqr) may produce incorrect results on some platforms, including x86_64. This bug occurs at random with a very low probability, and is not known to be exploitable in any way, though its exact impact is difficult to determine. The following has been determined: *) The probability of BN_sqr producing an incorrect result at random is very low: 1/2^64 on the single affected 32-bit platform (MIPS) and 1/2^128 on affected 64-bit platforms. *) On most platforms, RSA follows a different code path and RSA operations are not affected at all. For the remaining platforms (e.g. OpenSSL built without assembly support), pre-existing countermeasures thwart bug attacks [1]. *) Static ECDH is theoretically affected: it is possible to construct elliptic curve points that would falsely appear to be on the given curve. However, there is no known computationally feasible way to construct such points with low order, and so the security of static ECDH private keys is believed to be unaffected. *) Other routines known to be theoretically affected are modular exponentiation, primality testing, DSA, RSA blinding, JPAKE and SRP. No exploits are known and straightforward bug attacks fail - either the attacker cannot control when the bug triggers, or no private key material is involved.
- Found by Pieter Wuille (Blockstream).
- CVE-2015-0204 (OpenSSL Advisory) [Low severity] 06 January 2015:
- An OpenSSL client will accept the use of an RSA temporary key in a non-export RSA key exchange ciphersuite. A server could present a weak temporary key and downgrade the security of the session.
- Found by Karthikeyan Bhargavan of the PROSECCO team at INRIA.
- CVE-2014-8275 (OpenSSL Advisory) [Low severity] 05 January 2015:
- OpenSSL accepts several non-DER-variations of certificate signature algorithm and signature encodings. OpenSSL also does not enforce a match between the signature algorithm between the signed and unsigned portions of the certificate. By modifying the contents of the signature algorithm or the encoding of the signature, it is possible to change the certificate's fingerprint. This does not allow an attacker to forge certificates, and does not affect certificate verification or OpenSSL servers/clients in any other way. It also does not affect common revocation mechanisms. Only custom applications that rely on the uniqueness of the fingerprint (e.g. certificate blacklists) may be affected.
- Found by Antti Karjalainen and Tuomo Untinen from the Codenomicon CROSS program/Konrad Kraszewski from Google.
- CVE-2014-3572 (OpenSSL Advisory) [Low severity] 05 January 2015:
- An OpenSSL client will accept a handshake using an ephemeral ECDH ciphersuite using an ECDSA certificate if the server key exchange message is omitted. This effectively removes forward secrecy from the ciphersuite.
- Found by Karthikeyan Bhargavan of the PROSECCO team at INRIA.
- CVE-2014-3571 (OpenSSL Advisory) [Moderate severity] 05 January 2015:
- A carefully crafted DTLS message can cause a segmentation fault in OpenSSL due to a NULL pointer dereference. This could lead to a Denial Of Service attack.
- Found by Markus Stenberg of Cisco Systems, Inc.
2014
- CVE-2014-3569 (OpenSSL Advisory) [Low severity] 21 October 2014:
- When openssl is built with the no-ssl3 option and a SSL v3 ClientHello is received the ssl method would be set to NULL which could later result in a NULL pointer dereference.
- Found by Frank Schmirler.
- CVE-2014-3568 (OpenSSL Advisory) [Low severity] 15 October 2014:
- When OpenSSL is configured with "no-ssl3" as a build option, servers could accept and complete a SSL 3.0 handshake, and clients could be configured to send them.
- Found by Akamai Technologies.
- CVE-2014-3567 (OpenSSL Advisory) [Moderate severity] 15 October 2014:
- When an OpenSSL SSL/TLS/DTLS server receives a session ticket the integrity of that ticket is first verified. In the event of a session ticket integrity check failing, OpenSSL will fail to free memory causing a memory leak. By sending a large number of invalid session tickets an attacker could exploit this issue in a Denial Of Service attack.
- CVE-2014-3513 (OpenSSL Advisory) [High severity] 15 October 2014:
- A flaw in the DTLS SRTP extension parsing code allows an attacker, who sends a carefully crafted handshake message, to cause OpenSSL to fail to free up to 64k of memory causing a memory leak. This could be exploited in a Denial Of Service attack. This issue affects OpenSSL 1.0.1 server implementations for both SSL/TLS and DTLS regardless of whether SRTP is used or configured. Implementations of OpenSSL that have been compiled with OPENSSL_NO_SRTP defined are not affected.
- Found by LibreSSL project.
- Fixed in OpenSSL 1.0.1j (Affected since 1.0.1)
- CVE-2014-5139 (OpenSSL Advisory) 06 August 2014:
- A crash was found affecting SRP ciphersuites used in a Server Hello message. The issue affects OpenSSL clients and allows a malicious server to crash the client with a null pointer dereference (read) by specifying an SRP ciphersuite even though it was not properly negotiated with the client. This could lead to a Denial of Service.
- Found by Joonas Kuorilehto and Riku Hietamäki (Codenomicon).
- Fixed in OpenSSL 1.0.1i (Affected since 1.0.1)
- CVE-2014-3512 (OpenSSL Advisory) 06 August 2014:
- A SRP buffer overrun was found. A malicious client or server can send invalid SRP parameters and overrun an internal buffer. Only applications which are explicitly set up for SRP use are affected.
- Found by Sean Devlin and Watson Ladd (Cryptography Services, NCC Group).
- Fixed in OpenSSL 1.0.1i (Affected since 1.0.1)
- CVE-2014-3511 (OpenSSL Advisory) 06 August 2014:
- A flaw in the OpenSSL SSL/TLS server code causes the server to negotiate TLS 1.0 instead of higher protocol versions when the ClientHello message is badly fragmented. This allows a man-in-the-middle attacker to force a downgrade to TLS 1.0 even if both the server and the client support a higher protocol version, by modifying the client's TLS records.
- Found by David Benjamin and Adam Langley (Google).
- Fixed in OpenSSL 1.0.1i (Affected since 1.0.1)
- CVE-2014-3510 (OpenSSL Advisory) 06 August 2014:
- A flaw in handling DTLS anonymous EC(DH) ciphersuites was found. OpenSSL DTLS clients enabling anonymous (EC)DH ciphersuites are subject to a denial of service attack. A malicious server can crash the client with a null pointer dereference (read) by specifying an anonymous (EC)DH ciphersuite and sending carefully crafted handshake messages.
- Found by Felix Gröbert (Google).
- CVE-2014-3509 (OpenSSL Advisory) 06 August 2014:
- A race condition was found in ssl_parse_serverhello_tlsext. If a multithreaded client connects to a malicious server using a resumed session and the server sends an ec point format extension, it could write up to 255 bytes to freed memory.
- Found by Gabor Tyukasz (LogMeIn Inc).
- Fixed in OpenSSL 1.0.1i (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.0n
- CVE-2014-3508 (OpenSSL Advisory) 06 August 2014:
- A flaw in OBJ_obj2txt may cause pretty printing functions such as X509_name_oneline, X509_name_print_ex, to leak some information from the stack. Applications may be affected if they echo pretty printing output to the attacker. OpenSSL SSL/TLS clients and servers themselves are not affected.
- Found by Ivan Fratric (Google).
- CVE-2014-3507 (OpenSSL Advisory) 06 August 2014:
- A DTLS memory leak from zero-length fragments was found. By sending carefully crafted DTLS packets an attacker could cause OpenSSL to leak memory. This could lead to a Denial of Service attack.
- Found by Adam Langley (Google).
- CVE-2014-3506 (OpenSSL Advisory) 06 August 2014:
- A DTLS flaw leading to memory exhaustion was found. An attacker can force openssl to consume large amounts of memory whilst processing DTLS handshake messages. This could lead to a Denial of Service attack.
- Found by Adam Langley (Google).
- CVE-2014-3505 (OpenSSL Advisory) 06 August 2014:
- A Double Free was found when processing DTLS packets. An attacker can force an error condition which causes openssl to crash whilst processing DTLS packets due to memory being freed twice. This could lead to a Denial of Service attack.
- Found by Adam Langley and Wan-Teh Chang (Google).
- CVE-2014-0224 (OpenSSL Advisory) 05 June 2014:
- An attacker can force the use of weak keying material in OpenSSL SSL/TLS clients and servers. This can be exploited by a Man-in-the-middle (MITM) attack where the attacker can decrypt and modify traffic from the attacked client and server.
- Found by KIKUCHI Masashi (Lepidum Co. Ltd.).
- CVE-2014-0221 (OpenSSL Advisory) 05 June 2014:
- By sending an invalid DTLS handshake to an OpenSSL DTLS client the code can be made to recurse eventually crashing in a DoS attack. Only applications using OpenSSL as a DTLS client are affected.
- Found by Imre Rad (Search-Lab Ltd.).
- CVE-2014-0195 (OpenSSL Advisory) 05 June 2014:
- A buffer overrun attack can be triggered by sending invalid DTLS fragments to an OpenSSL DTLS client or server. This is potentially exploitable to run arbitrary code on a vulnerable client or server. Only applications using OpenSSL as a DTLS client or server affected.
- Found by Jüri Aedla.
- CVE-2014-3470 (OpenSSL Advisory) 30 May 2014:
- OpenSSL TLS clients enabling anonymous ECDH ciphersuites are subject to a denial of service attack.
- Found by Felix Gröbert and Ivan Fratrić (Google).
- CVE-2014-0198 (OpenSSL Advisory) 21 April 2014:
- A flaw in the do_ssl3_write function can allow remote attackers to cause a denial of service via a NULL pointer dereference. This flaw only affects OpenSSL 1.0.0 and 1.0.1 where SSL_MODE_RELEASE_BUFFERS is enabled, which is not the default and not common.
- Fixed in OpenSSL 1.0.1h (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.0m
- CVE-2010-5298 (OpenSSL Advisory) 08 April 2014:
- A race condition in the ssl3_read_bytes function can allow remote attackers to inject data across sessions or cause a denial of service. This flaw only affects multithreaded applications using OpenSSL 1.0.0 and 1.0.1, where SSL_MODE_RELEASE_BUFFERS is enabled, which is not the default and not common.
- Fixed in OpenSSL 1.0.1h (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.0m
- CVE-2014-0160 (OpenSSL Advisory) 07 April 2014:
- A missing bounds check in the handling of the TLS heartbeat extension can be used to reveal up to 64kB of memory to a connected client or server (a.k.a. Heartbleed). This issue did not affect versions of OpenSSL prior to 1.0.1.
- Found by Neel Mehta.
- Fixed in OpenSSL 1.0.1g (Affected since 1.0.1)
- CVE-2014-0076 (OpenSSL Advisory) 14 February 2014:
- Fix for the attack described in the paper "Recovering OpenSSL ECDSA Nonces Using the FLUSH+RELOAD Cache Side-channel Attack".
- Found by Yuval Yarom and Naomi Benger.
- Fixed in OpenSSL 1.0.1g (git commit) (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.0m, OpenSSL 0.9.8za
- CVE-2013-4353 06 January 2014:
- A carefully crafted invalid TLS handshake could crash OpenSSL with a NULL pointer exception. A malicious server could use this flaw to crash a connecting client. This issue only affected OpenSSL 1.0.1 versions.
- Found by Anton Johansson.
- Fixed in OpenSSL 1.0.1f (git commit) (Affected since 1.0.1)
2013
- CVE-2013-6449 14 December 2013:
- A flaw in OpenSSL can cause an application using OpenSSL to crash when using TLS version 1.2. This issue only affected OpenSSL 1.0.1 versions.
- Found by Ron Barber.
- Fixed in OpenSSL 1.0.1f (git commit) (Affected since 1.0.1)
- CVE-2013-6450 13 December 2013:
- A flaw in DTLS handling can cause an application using OpenSSL and DTLS to crash. This is not a vulnerability for OpenSSL prior to 1.0.0.
- Found by Dmitry Sobinov.
- Fixed in OpenSSL 1.0.1f (git commit) (Affected since 1.0.1)
- This issue was also addressed in OpenSSL 1.0.0l
- CVE-2013-0166 (OpenSSL Advisory) 05 February 2013:
- A flaw in the OpenSSL handling of OCSP response verification can be exploited in a denial of service attack.
- Found by Stephen Henson.
- CVE-2012-2686 (OpenSSL Advisory) 05 February 2013:
- A flaw in the OpenSSL handling of CBC ciphersuites in TLS 1.1 and TLS 1.2 on AES-NI supporting platforms can be exploited in a DoS attack.
- Found by Adam Langley and Wolfgang Ettlinger.
- Fixed in OpenSSL 1.0.1d (Affected since 1.0.1)
- CVE-2013-0169 (OpenSSL Advisory) 04 February 2013:
- A weakness in the handling of CBC ciphersuites in SSL, TLS and DTLS which could lead to plaintext recovery by exploiting timing differences arising during MAC processing.
- Found by Nadhem J. AlFardan and Kenneth G. Paterson of the Information Security Group Royal Holloway, University of London.
2012
- CVE-2012-2333 (OpenSSL Advisory) 10 May 2012:
- An integer underflow flaw, leading to a buffer over-read, was found in the way OpenSSL handled TLS 1.1, TLS 1.2, and DTLS (Datagram Transport Layer Security) application data record lengths when using a block cipher in CBC (cipher-block chaining) mode. A malicious TLS 1.1, TLS 1.2, or DTLS client or server could use this flaw to crash its connection peer.
- Found by Codenomicon.
- CVE-2012-2110 (OpenSSL Advisory) 19 April 2012:
- Multiple numeric conversion errors, leading to a buffer overflow, were found in the way OpenSSL parsed ASN.1 (Abstract Syntax Notation One) data from BIO (OpenSSL's I/O abstraction) inputs. Specially-crafted DER (Distinguished Encoding Rules) encoded data read from a file or other BIO input could cause an application using the OpenSSL library to crash or, potentially, execute arbitrary code.
- Found by Tavis Ormandy.