Ubuntu 2821-1: GnuTLS vulnerability

    Date30 Nov 2015
    CategoryUbuntu
    36
    Posted ByLinuxSecurity Advisories
    GnuTLS could be made to expose sensitive information over the network.
    ==========================================================================
    Ubuntu Security Notice USN-2821-1
    November 30, 2015
    
    gnutls26 vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    - Ubuntu 12.04 LTS
    
    Summary:
    
    GnuTLS could be made to expose sensitive information over the network.
    
    Software Description:
    - gnutls26: GNU TLS library
    
    Details:
    
    It was discovered that GnuTLS incorrectly validated the first byte of
    padding in CBC modes. A remote attacker could possibly use this issue to
    perform a padding oracle attack.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      libgnutls26                     2.12.23-12ubuntu2.3
    
    Ubuntu 12.04 LTS:
      libgnutls26                     2.12.14-5ubuntu3.10
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2821-1
      https://launchpad.net/bugs/1510163
    
    Package Information:
      https://launchpad.net/ubuntu/+source/gnutls26/2.12.23-12ubuntu2.3
      https://launchpad.net/ubuntu/+source/gnutls26/2.12.14-5ubuntu3.10
    
    
    
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