From 8954b54182d45fde2d991e7ed80471457d5b2c16 Mon Sep 17 00:00:00 2001 From: Matt Caswell Date: Tue, 1 Mar 2016 11:00:48 +0000 Subject: [PATCH] Update CHANGES and NEWS for new release Reviewed-by: Richard Levitte --- CHANGES | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ NEWS | 10 ++++++- 2 files changed, 98 insertions(+), 1 deletion(-) diff --git a/CHANGES b/CHANGES index 213b017b5e..a78e7542a8 100644 --- a/CHANGES +++ b/CHANGES @@ -24,8 +24,21 @@ 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. + (CVE-2016-0800) [Viktor Dukhovni] + *) Fix a double-free in DSA code + + 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. + + This issue was reported to OpenSSL by Adam Langley(Google/BoringSSL) using + libFuzzer. + (CVE-2016-0705) + [Stephen Henson] + *) Disable SRP fake user seed to address a server memory leak. Add a new method SRP_VBASE_get1_by_user that handles the seed properly. @@ -45,6 +58,82 @@ (CVE-2016-0798) [Emilia Käsper] + *) Fix BN_hex2bn/BN_dec2bn NULL pointer deref/heap corruption + + 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. + + This issue was reported to OpenSSL by Guido Vranken. + (CVE-2016-0797) + [Matt Caswell] + + *) Fix memory issues in BIO_*printf functions + + 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. + + This issue was reported to OpenSSL Guido Vranken. + (CVE-2016-0799) + [Matt Caswell] + + *) Side channel attack on modular exponentiation + + 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. + + This issue was reported to OpenSSL by Yuval Yarom, The University of + Adelaide and NICTA, Daniel Genkin, Technion and Tel Aviv University, and + Nadia Heninger, University of Pennsylvania with more information at + http://cachebleed.info. + (CVE-2016-0702) + [Andy Polyakov] + + *) Change the req app to generate a 2048-bit RSA/DSA key by default, + if no keysize is specified with default_bits. This fixes an + omission in an earlier change that changed all RSA/DSA key generation + apps to use 2048 bits by default. + [Emilia Käsper] + Changes between 1.0.1q and 1.0.1r [28 Jan 2016] *) Protection for DH small subgroup attacks diff --git a/NEWS b/NEWS index da17c1e39e..83b3a64ca5 100644 --- a/NEWS +++ b/NEWS @@ -8,7 +8,15 @@ Major changes between OpenSSL 1.0.1r and OpenSSL 1.0.1s [under development] o Disable weak ciphers in SSLv3 and up in default builds of OpenSSL. - o Disable SSLv2 default build, default negotiation and weak ciphers. + o Disable SSLv2 default build, default negotiation and weak ciphers + (CVE-2016-0800) + o Fix a double-free in DSA code (CVE-2016-0705) + o Disable SRP fake user seed to address a server memory leak + (CVE-2016-0798) + o Fix BN_hex2bn/BN_dec2bn NULL pointer deref/heap corruption + (CVE-2016-0797) + o Fix memory issues in BIO_*printf functions (CVE-2016-0799) + o Fix side channel attack on modular exponentiation (CVE-2016-0702) Major changes between OpenSSL 1.0.1q and OpenSSL 1.0.1r [28 Jan 2016] -- 2.25.1