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HistoryMar 16, 2016 - 3:28 p.m.

Security update for sles12-docker-image (important)


0.975 High




This update for sles12-docker-image fixes issues with binaries and
libraries included in the image where security updates have been made
available in the last weeks.

glibc security issues fixed:

  • CVE-2015-7547: A stack-based buffer overflow in getaddrinfo allowed
    remote attackers to cause a crash or execute arbitrary code via crafted
    and timed DNS responses (bsc#961721)
  • CVE-2015-8777: Insufficient checking of LD_POINTER_GUARD environment
    variable allowed local attackers to bypass the pointer guarding
    protection of the dynamic loader on set-user-ID and set-group-ID
    programs (bsc#950944)
  • CVE-2015-8776: Out-of-range time values passed to the strftime function
    may cause it to crash, leading to a denial of service, or potentially
    disclosure information (bsc#962736)
  • CVE-2015-8778: Integer overflow in hcreate and hcreate_r could have
    caused an out-of-bound memory access. leading to application crashes or,
    potentially, arbitrary code execution (bsc#962737)
  • CVE-2014-9761: A stack overflow (unbounded alloca) could have caused
    applications which process long strings with the nan function to crash
    or, potentially, execute arbitrary code. (bsc#962738)
  • CVE-2015-8779: A stack overflow (unbounded alloca) in the catopen
    function could have caused applications which pass long strings to the
    catopen function to crash or, potentially execute arbitrary code.

glibc bugs fixed:

  • bsc#955647: Resource leak in resolver
  • bsc#956716: Don’t do lock elision on an error checking mutex
  • bsc#958315: Reinitialize dl_load_write_lock on fork

openssl security bugs fixed: 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

  • 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

  • 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

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.

  • CVE-2015-3194: 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. (bsc#957815)

  • CVE-2015-3195: When presented with a malformed X509_ATTRIBUTE structure
    OpenSSL would 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. (bsc#957812)

  • CVE-2015-3196: If PSK identity hints are received by a multi-threaded
    client then the values were wrongly updated in the parent SSL_CTX
    structure. This could result in a race condition potentially leading to
    a double free of the identify hint data. (bsc#957813)

openssl bugs fixed:

  • Avoid running OPENSSL_config twice. This avoids breaking engine loading.
  • 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 digest. (bnc#958501)
  • Clear the error after setting non-fips mode (bsc#947104)
  • Improve S/390 performance on IBM z196 and z13 (bsc#954256)
  • Add support for "ciphers" providing no encryption (bsc#937085)

libxml2 security issues fixed:

  • CVE-2015-8710: Parsing short unclosed HTML comment could cause
    uninitialized memory access, which allowed remote attackers to read
    contents from previous HTTP requests depending on the application
  • CVE-2015-1819 Enforce the reader to run in constant memory [bnc#928193]
  • CVE-2015-7941 Fix out of bound read with crafted xml input by stopping
    parsing on entities boundaries errors [bnc#951734]
  • CVE-2015-7942 Fix another variation of overflow in Conditional sections
  • CVE-2015-8241 Avoid extra processing of MarkupDecl when EOF [bnc#956018]
  • CVE-2015-8242 Buffer overead with HTML parser in push mode [bnc#956021]
  • CVE-2015-8317 Return if the encoding declaration is broken or encoding
    conversion failed [bnc#956260]
  • CVE-2015-5312 Fix another entity expansion issue [bnc#957105]
  • CVE-2015-7497 Avoid an heap buffer overflow in xmlDictComputeFastQKey
  • CVE-2015-7498 Processes entities after encoding conversion failures
  • CVE-2015-7499 Add xmlHaltParser() to stop the parser / Detect
    incoherency on GROW [bnc#957109]
  • CVE-2015-8317 Multiple out-of-bound read could lead to denial of service
  • CVE-2015-8035 DoS when parsing specially crafted XML document if XZ
    support is enabled [bnc#954429]
  • CVE-2015-7500 Fix memory access error due to incorrect entities
    boundaries [bnc#957110]

And other security and non-security updates found in the SUSE Linux
Enterprise 12 GA line.