Ubuntu 2365-1: LibVNCServer vulnerabilities

    Date29 Sep 2014
    CategoryUbuntu
    25
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in LibVNCServer.
    ==========================================================================
    Ubuntu Security Notice USN-2365-1
    September 29, 2014
    
    libvncserver vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    - Ubuntu 12.04 LTS
    
    Summary:
    
    Several security issues were fixed in LibVNCServer.
    
    Software Description:
    - libvncserver: vnc server library
    
    Details:
    
    Nicolas Ruff discovered that LibVNCServer incorrectly handled memory when
    being advertised large screen sizes by the server. If a user were tricked
    into connecting to a malicious server, an attacker could use this issue to
    cause a denial of service, or possibly execute arbitrary code.
    (CVE-2014-6051, CVE-2014-6052)
    
    Nicolas Ruff discovered that LibVNCServer incorrectly handled large
    ClientCutText messages. A remote attacker could use this issue to cause a
    server to crash, resulting in a denial of service. (CVE-2014-6053)
    
    Nicolas Ruff discovered that LibVNCServer incorrectly handled zero scaling
    factor values. A remote attacker could use this issue to cause a server to
    crash, resulting in a denial of service. (CVE-2014-6054)
    
    Nicolas Ruff discovered that LibVNCServer incorrectly handled memory in the
    file transfer feature. A remote attacker could use this issue to cause a
    server to crash, resulting in a denial of service, or possibly execute
    arbitrary code. (CVE-2014-6055)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      libvncserver0                   0.9.9+dfsg-1ubuntu1.1
    
    Ubuntu 12.04 LTS:
      libvncserver0                   0.9.8.2-2ubuntu1.1
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2365-1
      CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054,
      CVE-2014-6055
    
    Package Information:
      https://launchpad.net/ubuntu/+source/libvncserver/0.9.9+dfsg-1ubuntu1.1
      https://launchpad.net/ubuntu/+source/libvncserver/0.9.8.2-2ubuntu1.1
    
    
    
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