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<patchinfo incident="4769">
  <issue id="963415" tracker="bnc">VUL-1: CVE-2015-3197: openssl: SSLv2 doesn't block disabled ciphers</issue>
  <issue id="958501" tracker="bnc">openssl: automatic fallback to SHA1 and no error if non FIPS algo is used</issue>
<issue tracker="bnc" id="968046">VUL-0: EMBARGOED: CVE-2016-0800: openssl: Cross-protocol attack on TLS using SSLv2 (DROWN)</issue>
<issue tracker="bnc" id="968047">VUL-0: EMBARGOED: CVE-2016-0705: openssl: Double-free in DSA code</issue>
<issue tracker="bnc" id="968048">VUL-1: EMBARGOED: CVE-2016-0797: openssl: BN_hex2bn/BN_dec2bn NULL pointer deref/heap corruption</issue>
<issue tracker="bnc" id="968050">VUL-1: EMBARGOED: CVE-2016-0702: openssl: Side channel attack on modular exponentiation</issue>
<issue tracker="bnc" id="968051">VUL-0: EMBARGOED: CVE-2016-0703: openssl: Divide-and-conquer session key recovery in SSLv2</issue>
<issue tracker="bnc" id="968053">VUL-0: EMBARGOED: CVE-2016-0704: openssl: Bleichenbacher oracle in SSLv2</issue>
<issue tracker="bnc" id="968265">VUL-1: CVE-2016-0798: openssl: avoid memory leak in SRP</issue>
<issue tracker="bnc" id="968374">VUL-1: CVE-2016-0799: openssl: memory issues in BIO_*printf functions</issue>
<issue tracker="cve" id="CVE-2015-3197"/>
<issue tracker="cve" id="CVE-2016-0702"/>
<issue tracker="cve" id="CVE-2016-0703"/>
<issue tracker="cve" id="CVE-2016-0704"/>
<issue tracker="cve" id="CVE-2016-0705"/>
<issue tracker="cve" id="CVE-2016-0797"/>
<issue tracker="cve" id="CVE-2016-0798"/>
<issue tracker="cve" id="CVE-2016-0799"/>
<issue tracker="cve" id="CVE-2016-0800"/>
  <category>security</category>
  <rating>important</rating>
  <packager>vitezslav_cizek</packager>
  <description>
This update for openssl fixes various security issues:

Security issues fixed:
- CVE-2016-0800 aka the "DROWN" attack (bsc#968046):
  OpenSSL was vulnerable to a cross-protocol attack that could lead to
  decryption of TLS sessions by using a server supporting SSLv2 and
  EXPORT cipher suites as a Bleichenbacher RSA padding oracle.

This update changes the openssl library to:

* Disable SSLv2 protocol support by default.
   
    This can be overridden by setting the environment variable
    "OPENSSL_ALLOW_SSL2" or by using SSL_CTX_clear_options using the
    SSL_OP_NO_SSLv2 flag.

Note that various services and clients had already disabled SSL
    protocol 2 by default previously.

* Disable all weak EXPORT ciphers by default. These can be reenabled
    if required by old legacy software using the environment variable
    "OPENSSL_ALLOW_EXPORT".

- CVE-2016-0702 aka the "CacheBleed" attack. (bsc#968050)
  Various changes in the modular exponentation code were added that
  make sure that it is not possible to recover RSA secret keys by
  analyzing cache-bank conflicts on the Intel Sandy-Bridge microarchitecture.

Note that this was only exploitable if the malicious code was running
  on the same hyper threaded Intel Sandy Bridge processor as the victim
  thread performing decryptions.

- CVE-2016-0705 (bnc#968047):
  A double free() bug in the DSA ASN1 parser code was fixed that could
  be abused to facilitate a denial-of-service attack.

- CVE-2016-0797 (bnc#968048):
  The BN_hex2bn() and BN_dec2bn() functions had a bug that could
  result in an attempt to de-reference a NULL pointer leading to crashes.
  This could have security consequences if these functions were ever called by
  user applications with large untrusted hex/decimal data. Also,
  internal usage of these functions in OpenSSL uses data from config
  files or application command line arguments. If user developed
  applications generated config file data based on untrusted data,
  then this could have had security consequences as well.

- CVE-2016-0798 (bnc#968265)
  The SRP user database lookup method SRP_VBASE_get_by_user() had a memory
  leak that attackers could abuse to facility DoS attacks. To mitigate
  the issue, the seed handling in SRP_VBASE_get_by_user() was disabled
  even if the user has configured a seed. Applications are advised to
  migrate to SRP_VBASE_get1_by_user().

- CVE-2016-0799 (bnc#968374)
  On many 64 bit systems, the internal fmtstr() and doapr_outch()
  functions could miscalculate the length of a string and attempt to
  access out-of-bounds memory locations. These problems could have
  enabled 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 have been vulnerable. OpenSSL itself uses
  these functions when printing out human-readable dumps of ASN.1
  data. Therefore applications that print this data could have been
  vulnerable if the data is from untrusted sources. OpenSSL command line
  applications could also have been vulnerable when they print out ASN.1
  data, or if untrusted data is passed as command line arguments. Libssl
  is not considered directly vulnerable.

- CVE-2015-3197 (bsc#963415):
  The SSLv2 protocol did not block disabled ciphers.

Note that the March 1st 2016 release also references following CVEs
that were fixed by us with CVE-2015-0293 in 2015:

- CVE-2016-0703 (bsc#968051): 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. It would have made the above
  "DROWN" attack much easier.
- CVE-2016-0704 (bsc#968053): "Bleichenbacher oracle in SSLv2"
  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. It would have made the above "DROWN" attack much easier.

Also the following bug was fixed:
- Ensure that OpenSSL doesn't fall back to the default digest
  algorithm (SHA1) in case a non-FIPS algorithm was negotiated while
  running in FIPS mode. Instead, OpenSSL will refuse the session.
  (bnc#958501)
This update was imported from the SUSE:SLE-12-SP1:Update update project.</description>
  <summary>Security update for openssl</summary>
<stopped>review sles text</stopped></patchinfo>

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