Ubuntu 1384-1: Linux kernel (Oneiric backport) vulnerabilities

    Date06 Mar 2012
    CategoryUbuntu
    66
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-1384-1
    March 06, 2012
    
    linux-lts-backport-oneiric vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 10.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-lts-backport-oneiric: Linux kernel backport from Oneiric
    
    Details:
    
    A bug was discovered in the Linux kernel's calculation of OOM (Out of
    memory) scores, that would result in the wrong process being killed. A user
    could use this to kill the process with the highest OOM score, even if that
    process belongs to another user or the system. (CVE-2011-4097)
    
    Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl
    command. A local user, or user in a VM could exploit this flaw to bypass
    restrictions and gain read/write access to all data on the affected block
    device. (CVE-2011-4127)
    
    A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual
    interrupt control is not available a local user could use this to cause a
    denial of service by starting a timer. (CVE-2011-4622)
    
    A flaw was discovered in the XFS filesystem. If a local user mounts a
    specially crafted XFS image it could potential execute arbitrary code on
    the system. (CVE-2012-0038)
    
    Andy Whitcroft discovered a that the Overlayfs filesystem was not doing the
    extended permission checks needed by cgroups and Linux Security Modules
    (LSMs). A local user could exploit this to by-pass security policy and
    access files that should not be accessible. (CVE-2012-0055)
    
    A flaw was found in the linux kernels IPv4 IGMP query processing. A remote
    attacker could exploit this to cause a denial of service. (CVE-2012-0207)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 10.04 LTS:
      linux-image-3.0.0-16-generic    3.0.0-16.29~lucid1
      linux-image-3.0.0-16-generic-pae  3.0.0-16.29~lucid1
      linux-image-3.0.0-16-server     3.0.0-16.29~lucid1
      linux-image-3.0.0-16-virtual    3.0.0-16.29~lucid1
    
    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-1384-1
      CVE-2011-4097, CVE-2011-4127, CVE-2011-4622, CVE-2012-0038,
      CVE-2012-0055, CVE-2012-0207
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-backport-oneiric/3.0.0-16.29~lucid1
    
    
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