Ubuntu 1205-1: Linux kernel (Maverick backport) vulnerabilities

    Date13 Sep 2011
    CategoryUbuntu
    40
    Posted ByLinuxSecurity Advisories
    Multiple kernel flaws have been fixed.
    ==========================================================================
    Ubuntu Security Notice USN-1205-1
    September 13, 2011
    
    linux-lts-backport-maverick vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 10.04 LTS
    
    Summary:
    
    Multiple kernel flaws have been fixed.
    
    Software Description:
    - linux-lts-backport-maverick: Linux kernel backport from Maverick
    
    Details:
    
    It was discovered that the /proc filesystem did not correctly handle
    permission changes when programs executed. A local attacker could hold open
    files to examine details about programs running with higher privileges,
    potentially increasing the chances of exploiting additional
    vulnerabilities. (CVE-2011-1020)
    
    Dan Rosenberg discovered that the X.25 Rose network stack did not correctly
    handle certain fields. If a system was running with Rose enabled, a remote
    attacker could send specially crafted traffic to gain root privileges.
    (CVE-2011-1493)
    
    Dan Rosenberg discovered that the DCCP stack did not correctly handle
    certain packet structures. A remote attacker could exploit this to crash
    the system, leading to a denial of service. (CVE-2011-1770)
    
    Vasiliy Kulikov discovered that taskstats listeners were not correctly
    handled. A local attacker could expoit this to exhaust memory and CPU
    resources, leading to a denial of service. (CVE-2011-2484)
    
    It was discovered that Bluetooth l2cap and rfcomm did not correctly
    initialize structures. A local attacker could exploit this to read portions
    of the kernel stack, leading to a loss of privacy. (CVE-2011-2492)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 10.04 LTS:
      linux-image-2.6.35-30-generic   2.6.35-30.59~lucid1
      linux-image-2.6.35-30-generic-pae  2.6.35-30.59~lucid1
      linux-image-2.6.35-30-server    2.6.35-30.59~lucid1
      linux-image-2.6.35-30-virtual   2.6.35-30.59~lucid1
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-1205-1
      CVE-2011-1020, CVE-2011-1493, CVE-2011-1770, CVE-2011-2484,
      CVE-2011-2492
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-backport-maverick/2.6.35-30.59~lucid1
    
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