File _patchinfo of Package patchinfo.2040

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File _patchinfo of Package patchinfo.2040

<patchinfo incident="2040">
  <issue id="963415" tracker="bnc">VUL-1: CVE-2015-3197: openssl: SSLv2 doesn't block disabled ciphers</issue>
 <issue id="952871" tracker="bnc">Starting Software Management in yast fails if the package "openssl-ibmca" is installed</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="968048">VUL-1: EMBARGOED: CVE-2016-0797: openssl: BN_hex2bn/BN_dec2bn NULL pointer deref/heap corruption</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="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-2016-0797"/>
<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 compat-openssl098 fixes various security issues and bugs:

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-2016-0797 (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-2016-0799 (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 fixes the following bug:
- Avoid running OPENSSL_config twice. This avoids breaking
  engine loading and also fixes a memory leak in libssl. (bsc#952871)
</description>
  <summary>Security update for openssl</summary>
</patchinfo>

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