Ubuntu 1175-1: libpng vulnerabilities

    Date26 Jul 2011
    CategoryUbuntu
    77
    Posted ByLinuxSecurity Advisories
    Libpng could be made to run programs as your login if it opened a specially crafted file.
    ==========================================================================
    Ubuntu Security Notice USN-1175-1
    July 26, 2011
    
    libpng vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.04
    - Ubuntu 10.10
    - Ubuntu 10.04 LTS
    - Ubuntu 8.04 LTS
    
    Summary:
    
    Libpng could be made to run programs as your login if it opened a
    specially crafted file.
    
    Software Description:
    - libpng: PNG (Portable Network Graphics) file library
    
    Details:
    
    Frank Busse discovered that libpng did not properly handle certain
    malformed PNG images. If a user or automated system were tricked into
    opening a crafted PNG file, an attacker could cause libpng to crash,
    resulting in a denial of service. This issue only affected Ubuntu
    10.04 LTS, 10.10, and 11.04. (CVE-2011-2501)
    
    It was discovered that libpng did not properly handle certain malformed PNG
    images. If a user or automated system were tricked into opening a crafted
    PNG file, an attacker could cause a denial of service or possibly execute
    arbitrary code with the privileges of the user invoking the program.
    (CVE-2011-2690)
    
    Frank Busse discovered that libpng did not properly handle certain PNG
    images with invalid sCAL chunks. If a user or automated system were tricked
    into opening a crafted PNG file, an attacker could cause a denial of
    service or possibly execute arbitrary code with the privileges of the user
    invoking the program. (CVE-2011-2692)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.04:
      libpng12-0                      1.2.44-1ubuntu3.1
    
    Ubuntu 10.10:
      libpng12-0                      1.2.44-1ubuntu0.1
    
    Ubuntu 10.04 LTS:
      libpng12-0                      1.2.42-1ubuntu2.2
    
    Ubuntu 8.04 LTS:
      libpng12-0                      1.2.15~beta5-3ubuntu0.4
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-1175-1
      CVE-2011-2501, CVE-2011-2690, CVE-2011-2692
    
    Package Information:
      https://launchpad.net/ubuntu/+source/libpng/1.2.44-1ubuntu3.1
      https://launchpad.net/ubuntu/+source/libpng/1.2.44-1ubuntu0.1
      https://launchpad.net/ubuntu/+source/libpng/1.2.42-1ubuntu2.2
      https://launchpad.net/ubuntu/+source/libpng/1.2.15~beta5-3ubuntu0.4
    
    
    
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