Ubuntu 1272-1: Linux kernel vulnerabilities

    Date21 Nov 2011
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    Ubuntu Security Notice USN-1272-1
    November 21, 2011
    linux vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 10.10
    Several security issues were fixed in the kernel.
    Software Description:
    - linux: Linux kernel
    It was discovered that CIFS incorrectly handled authentication. When a user
    had a CIFS share mounted that required authentication, a local user could
    mount the same share without knowing the correct password. (CVE-2011-1585)
    Andrea Righi discovered a race condition in the KSM memory merging support.
    If KSM was being used, a local attacker could exploit this to crash the
    system, leading to a denial of service. (CVE-2011-2183)
    Vasily Averin discovered that the NFS Lock Manager (NLM) incorrectly
    handled unlock requests. A local attacker could exploit this to cause a
    denial of service. (CVE-2011-2491)
    Robert Swiecki discovered that mapping extensions were incorrectly handled.
    A local attacker could exploit this to crash the system, leading to a
    denial of service. (CVE-2011-2496)
    It was discovered that the wireless stack incorrectly verified SSID
    lengths. A local attacker could exploit this to cause a denial of service
    or gain root privileges. (CVE-2011-2517)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 10.10:
      linux-image-2.6.35-31-generic   2.6.35-31.62
      linux-image-2.6.35-31-generic-pae  2.6.35-31.62
      linux-image-2.6.35-31-omap      2.6.35-31.62
      linux-image-2.6.35-31-powerpc   2.6.35-31.62
      linux-image-2.6.35-31-powerpc-smp  2.6.35-31.62
      linux-image-2.6.35-31-powerpc64-smp  2.6.35-31.62
      linux-image-2.6.35-31-server    2.6.35-31.62
      linux-image-2.6.35-31-versatile  2.6.35-31.62
      linux-image-2.6.35-31-virtual   2.6.35-31.62
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    ATTENTION: Due to an unavoidable ABI change the kernel updates have
    been given a new version number, which requires you to recompile and
    reinstall all third party kernel modules you might have installed. If
    you use linux-restricted-modules, you have to update that package as
    well to get modules which work with the new kernel version. Unless you
    manually uninstalled the standard kernel metapackages (e.g. linux-generic,
    linux-server, linux-powerpc), a standard system upgrade will automatically
    perform this as well.
      CVE-2011-1585, CVE-2011-2183, CVE-2011-2491, CVE-2011-2496,
    Package Information:

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