Ubuntu 1285-1: Linux kernel vulnerabilities

    Date29 Nov 2011
    CategoryUbuntu
    37
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-1285-1
    November 29, 2011
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.04
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    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)
    
    Vasiliy Kulikov discovered that taskstats did not enforce access
    restrictions. A local attacker could exploit this to read certain
    information, leading to a loss of privacy. (CVE-2011-2494)
    
    Vasiliy Kulikov discovered that /proc/PID/io did not enforce access
    restrictions. A local attacker could exploit this to read certain
    information, leading to a loss of privacy. (CVE-2011-2495)
    
    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)
    
    Christian Ohm discovered that the perf command looks for configuration
    files in the current directory. If a privileged user were tricked into
    running perf in a directory containing a malicious configuration file, an
    attacker could run arbitrary commands and possibly gain privileges.
    (CVE-2011-2905)
    
    Vasiliy Kulikov discovered that the Comedi driver did not correctly clear
    memory. A local attacker could exploit this to read kernel stack memory,
    leading to a loss of privacy. (CVE-2011-2909)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.04:
      linux-image-2.6.38-13-generic   2.6.38-13.52
      linux-image-2.6.38-13-generic-pae  2.6.38-13.52
      linux-image-2.6.38-13-omap      2.6.38-13.52
      linux-image-2.6.38-13-powerpc   2.6.38-13.52
      linux-image-2.6.38-13-powerpc-smp  2.6.38-13.52
      linux-image-2.6.38-13-powerpc64-smp  2.6.38-13.52
      linux-image-2.6.38-13-server    2.6.38-13.52
      linux-image-2.6.38-13-versatile  2.6.38-13.52
      linux-image-2.6.38-13-virtual   2.6.38-13.52
    
    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.
    
    References:
      http://www.ubuntu.com/usn/usn-1285-1
      CVE-2011-2183, CVE-2011-2491, CVE-2011-2494, CVE-2011-2495,
      CVE-2011-2517, CVE-2011-2905, CVE-2011-2909
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/2.6.38-13.52
    
    
    
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