Ubuntu 1308-1: bzip2 vulnerability

    Date14 Dec 2011
    CategoryUbuntu
    57
    Posted ByLinuxSecurity Advisories
    Executables compressed by bzexe could be made to run programs as yourlogin.
    ==========================================================================
    Ubuntu Security Notice USN-1308-1
    December 14, 2011
    
    bzip2 vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.10
    - Ubuntu 11.04
    - Ubuntu 10.10
    - Ubuntu 10.04 LTS
    - Ubuntu 8.04 LTS
    
    Summary:
    
    Executables compressed by bzexe could be made to run programs as your
    login.
    
    Software Description:
    - bzip2: high-quality block-sorting file compressor - utilities
    
    Details:
    
    vladz discovered that executables compressed by bzexe insecurely create
    temporary files when they are ran. A local attacker could exploit this issue to
    execute arbitrary code as the user running a compressed executable.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.10:
      bzip2                           1.0.5-6ubuntu1.11.10.1
    
    Ubuntu 11.04:
      bzip2                           1.0.5-6ubuntu1.11.04.1
    
    Ubuntu 10.10:
      bzip2                           1.0.5-4ubuntu1.1
    
    Ubuntu 10.04 LTS:
      bzip2                           1.0.5-4ubuntu0.2
    
    Ubuntu 8.04 LTS:
      bzip2                           1.0.4-2ubuntu4.2
    
    In general, a standard system update will make all the necessary changes to
    the bzexe utility. If you have previously used bzexe to compress any
    executables, they need to be recompressed using the updated version.
    
    References:
      http://www.ubuntu.com/usn/usn-1308-1
      CVE-2011-4089
    
    Package Information:
      https://launchpad.net/ubuntu/+source/bzip2/1.0.5-6ubuntu1.11.10.1
      https://launchpad.net/ubuntu/+source/bzip2/1.0.5-6ubuntu1.11.04.1
      https://launchpad.net/ubuntu/+source/bzip2/1.0.5-4ubuntu1.1
      https://launchpad.net/ubuntu/+source/bzip2/1.0.5-4ubuntu0.2
      https://launchpad.net/ubuntu/+source/bzip2/1.0.4-2ubuntu4.2
    
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