Ubuntu 2317-1: Linux kernel (Trusty HWE) vulnerabilities

    Date18 Aug 2014
    CategoryUbuntu
    58
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2317-1
    August 18, 2014
    
    linux-lts-trusty vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty
    
    Details:
    
    Eric W. Biederman discovered a flaw with the mediation of mount flags in
    the Linux kernel's user namespace subsystem. An unprivileged user could
    exploit this flaw to by-pass mount restrictions, and potentially gain
    administrative privileges. (CVE-2014-5207)
    
    Kenton Varda discovered a flaw with read-only bind mounds when used with
    user namespaces. An unprivileged local user could exploit this flaw to gain
    full write privileges to a mount that should be read only. (CVE-2014-5206)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 LTS:
      linux-image-3.13.0-34-generic   3.13.0-34.60~precise1
      linux-image-3.13.0-34-generic-lpae  3.13.0-34.60~precise1
    
    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-2317-1
      CVE-2014-5206, CVE-2014-5207
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-34.60~precise1
    
    
    
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