Ubuntu 1246-1: Linux kernel vulnerabilities

    Date25 Oct 2011
    CategoryUbuntu
    34
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-1246-1
    October 25, 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:
    
    Dan Rosenberg discovered that the IPv4 diagnostic routines did not
    correctly validate certain requests. A local attacker could exploit this to
    consume CPU resources, leading to a denial of service. (CVE-2011-2213)
    
    Dan Rosenberg discovered that the Bluetooth stack incorrectly handled
    certain L2CAP requests. If a system was using Bluetooth, a remote attacker
    could send specially crafted traffic to crash the system or gain root
    privileges. (CVE-2011-2497)
    
    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)
    
    Mauro Carvalho Chehab discovered that the si4713 radio driver did not
    correctly check the length of memory copies. If this hardware was
    available, a local attacker could exploit this to crash the system or gain
    root privileges. (CVE-2011-2700)
    
    Herbert Xu discovered that certain fields were incorrectly handled when
    Generic Receive Offload (CVE-2011-2723)
    
    Time Warns discovered that long symlinks were incorrectly handled on Be
    filesystems. A local attacker could exploit this with a malformed Be
    filesystem and crash the system, leading to a denial of service.
    (CVE-2011-2928)
    
    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)
    
    Darren Lavender discovered that the CIFS client incorrectly handled certain
    large values. A remote attacker with a malicious server could exploit this
    to crash the system or possibly execute arbitrary code as the root user.
    (CVE-2011-3191)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.04:
      linux-image-2.6.38-12-generic   2.6.38-12.51
      linux-image-2.6.38-12-generic-pae  2.6.38-12.51
      linux-image-2.6.38-12-omap      2.6.38-12.51
      linux-image-2.6.38-12-powerpc   2.6.38-12.51
      linux-image-2.6.38-12-powerpc-smp  2.6.38-12.51
      linux-image-2.6.38-12-powerpc64-smp  2.6.38-12.51
      linux-image-2.6.38-12-server    2.6.38-12.51
      linux-image-2.6.38-12-versatile  2.6.38-12.51
      linux-image-2.6.38-12-virtual   2.6.38-12.51
    
    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-1246-1
      CVE-2011-2213, CVE-2011-2497, CVE-2011-2695, CVE-2011-2700,
      CVE-2011-2723, CVE-2011-2928, CVE-2011-3188, CVE-2011-3191
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/2.6.38-12.51
    
    
    
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