openSUSE Security Update: Security update for openssl
______________________________________________________________________________

Announcement ID:    openSUSE-SU-2016:0637-1
Rating:             important
References:         #957812 #957815 #963415 #968046 #968047 #968048 
                    #968050 #968265 #968374 
Cross-References:   CVE-2015-1794 CVE-2015-3194 CVE-2015-3195
                    CVE-2015-3197 CVE-2016-0701 CVE-2016-0702
                    CVE-2016-0705 CVE-2016-0797 CVE-2016-0798
                    CVE-2016-0799 CVE-2016-0800
Affected Products:
                    openSUSE Evergreen 11.4
______________________________________________________________________________

   An update that fixes 11 vulnerabilities is now available.

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.

   Older issues fixed:

   - CVE-2015-1794 follow-up to CVE-2015-1794 (the CVE bug as such doesn't
     affect 1.0.1 but use these patches to prevent potential attacks

   - CVE-2015-3195 fix leak with ASN.1 combine (bsc#957812)

   - CVE-2015-3194 add PSS parameter check (bsc#957815)

   - CVE-2015-3197 better SSLv2 cipher-suite enforcement (bsc#963415)


Patch Instructions:

   To install this openSUSE Security Update use YaST online_update.
   Alternatively you can run the command listed for your product:

   - openSUSE Evergreen 11.4:

      zypper in -t patch 2016-293=1

   To bring your system up-to-date, use "zypper patch".


Package List:

   - openSUSE Evergreen 11.4 (i586 x86_64):

      libopenssl-devel-1.0.1p-71.1
      libopenssl1_0_0-1.0.1p-71.1
      libopenssl1_0_0-debuginfo-1.0.1p-71.1
      openssl-1.0.1p-71.1
      openssl-debuginfo-1.0.1p-71.1
      openssl-debugsource-1.0.1p-71.1

   - openSUSE Evergreen 11.4 (x86_64):

      libopenssl-devel-32bit-1.0.1p-71.1
      libopenssl1_0_0-32bit-1.0.1p-71.1
      libopenssl1_0_0-debuginfo-32bit-1.0.1p-71.1

   - openSUSE Evergreen 11.4 (noarch):

      openssl-doc-1.0.1p-71.1

   - openSUSE Evergreen 11.4 (ia64):

      libopenssl1_0_0-debuginfo-x86-1.0.1p-71.1
      libopenssl1_0_0-x86-1.0.1p-71.1


References:

   https://www.suse.com/security/cve/CVE-2015-1794.html
   https://www.suse.com/security/cve/CVE-2015-3194.html
   https://www.suse.com/security/cve/CVE-2015-3195.html
   https://www.suse.com/security/cve/CVE-2015-3197.html
   https://www.suse.com/security/cve/CVE-2016-0701.html
   https://www.suse.com/security/cve/CVE-2016-0702.html
   https://www.suse.com/security/cve/CVE-2016-0705.html
   https://www.suse.com/security/cve/CVE-2016-0797.html
   https://www.suse.com/security/cve/CVE-2016-0798.html
   https://www.suse.com/security/cve/CVE-2016-0799.html
   https://www.suse.com/security/cve/CVE-2016-0800.html
   https://bugzilla.suse.com/957812
   https://bugzilla.suse.com/957815
   https://bugzilla.suse.com/963415
   https://bugzilla.suse.com/968046
   https://bugzilla.suse.com/968047
   https://bugzilla.suse.com/968048
   https://bugzilla.suse.com/968050
   https://bugzilla.suse.com/968265
   https://bugzilla.suse.com/968374

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