Ubuntu 2420-1: Linux kernel vulnerabilities

    Date24 Nov 2014
    CategoryUbuntu
    30
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2420-1
    November 25, 2014
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    A flaw was discovered in how the Linux kernel's KVM (Kernel Virtual
    Machine) subsystem handles the CR4 control register at VM entry on Intel
    processors. A local host OS user can exploit this to cause a denial of
    service (kill arbitrary processes, or system disruption) by leveraging
    /dev/kvm access. (CVE-2014-3690)
    
    Don Bailey discovered a flaw in the LZO decompress algorithm used by the
    Linux kernel. An attacker could exploit this flaw to cause a denial of
    service (memory corruption or OOPS). (CVE-2014-4608)
    
    Andy Lutomirski discovered a flaw in how the Linux kernel handles
    pivot_root when used with a chroot directory. A local user could exploit
    this flaw to cause a denial of service (mount-tree loop). (CVE-2014-7970)
    
    Andy Lutomirski discovered that the Linux kernel was not checking the
    CAP_SYS_ADMIN when remounting filesystems to read-only. A local user could
    exploit this flaw to cause a denial of service (loss of writability).
    (CVE-2014-7975)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.13.0-40-generic   3.13.0-40.69
      linux-image-3.13.0-40-generic-lpae  3.13.0-40.69
      linux-image-3.13.0-40-lowlatency  3.13.0-40.69
      linux-image-3.13.0-40-powerpc-e500  3.13.0-40.69
      linux-image-3.13.0-40-powerpc-e500mc  3.13.0-40.69
      linux-image-3.13.0-40-powerpc-smp  3.13.0-40.69
      linux-image-3.13.0-40-powerpc64-emb  3.13.0-40.69
      linux-image-3.13.0-40-powerpc64-smp  3.13.0-40.69
    
    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-2420-1
      CVE-2014-3690, CVE-2014-4608, CVE-2014-7970, CVE-2014-7975
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.13.0-40.69
    
    
    
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