Ubuntu 1243-1: Linux kernel vulnerabilities

    Date25 Oct 2011
    CategoryUbuntu
    43
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-1243-1
    October 25, 2011
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 10.10
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    It was discovered that the security fix for CVE-2010-4250 introduced a
    regression. A remote attacker could exploit this to crash the system,
    leading to a denial of service. (CVE-2011-1479)
    
    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 EXT4 filesystem contained multiple off-by-one
    flaws. A local attacker could exploit this to crash the system, leading to
    a denial of service. (CVE-2011-2695)
    
    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)
    
    Dan Kaminsky discovered that the kernel incorrectly handled random sequence
    number generation. An attacker could use this flaw to possibly predict
    sequence numbers and inject packets. (CVE-2011-3188)
    
    Yogesh Sharma discovered that CIFS did not correctly handle UNCs that had
    no prefixpaths. A local attacker with access to a CIFS partition could
    exploit this to crash the system, leading to a denial of service.
    (CVE-2011-3363)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 10.10:
      linux-image-2.6.35-30-generic   2.6.35-30.61
      linux-image-2.6.35-30-generic-pae  2.6.35-30.61
      linux-image-2.6.35-30-omap      2.6.35-30.61
      linux-image-2.6.35-30-powerpc   2.6.35-30.61
      linux-image-2.6.35-30-powerpc-smp  2.6.35-30.61
      linux-image-2.6.35-30-powerpc64-smp  2.6.35-30.61
      linux-image-2.6.35-30-server    2.6.35-30.61
      linux-image-2.6.35-30-versatile  2.6.35-30.61
      linux-image-2.6.35-30-virtual   2.6.35-30.61
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-1243-1
      CVE-2011-1479, CVE-2011-2494, CVE-2011-2495, CVE-2011-2695,
      CVE-2011-2905, CVE-2011-2909, CVE-2011-3188, CVE-2011-3363
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/2.6.35-30.61
    
    
    
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