Ubuntu 2445-1: Linux kernel (Trusty HWE) vulnerabilities

    Date12 Dec 2014
    CategoryUbuntu
    49
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2445-1
    December 12, 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:
    
    An information leak in the Linux kernel was discovered that could leak the
    high 16 bits of the kernel stack address on 32-bit Kernel Virtual Machine
    (KVM) paravirt guests. A user in the guest OS could exploit this leak to
    obtain information that could potentially be used to aid in attacking the
    kernel. (CVE-2014-8134)
    
    Rabin Vincent, Robert Swiecki, Russell King discovered that the ftrace
    subsystem of the Linux kernel does not properly handle private syscall
    numbers. A local user could exploit this flaw to cause a denial of service
    (OOPS). (CVE-2014-7826)
    
    A flaw in the handling of malformed ASCONF chunks by SCTP (Stream Control
    Transmission Protocol) implementation in the Linux kernel was discovered. A
    remote attacker could exploit this flaw to cause a denial of service
    (system crash). (CVE-2014-3673)
    
    A flaw in the handling of duplicate ASCONF chunks by SCTP (Stream Control
    Transmission Protocol) implementation in the Linux kernel was discovered. A
    remote attacker could exploit this flaw to cause a denial of service
    (panic). (CVE-2014-3687)
    
    It was discovered that excessive queuing by SCTP (Stream Control
    Transmission Protocol) implementation in the Linux kernel can cause memory
    pressure. A remote attacker could exploit this flaw to cause a denial of
    service. (CVE-2014-3688)
    
    Rabin Vincent, Robert Swiecki, Russell Kinglaw discovered a flaw in how the
    perf subsystem of the Linux kernel handles private systecall numbers. A
    local user could exploit this to cause a denial of service (OOPS) or bypass
    ASLR protections via a crafted application. (CVE-2014-7825)
    
    The KVM (kernel virtual machine) subsystem of the Linux kernel
    miscalculates the number of memory pages during the handling of a mapping
    failure. A guest OS user could exploit this to cause a denial of service
    (host OS page unpinning) or possibly have unspecified other impact by
    leveraging guest OS privileges. (CVE-2014-8369)
    
    Andy Lutomirski discovered that the Linux kernel does not properly handle
    faults associated with the Stack Segment (SS) register on the x86
    architecture. A local attacker could exploit this flaw to cause a denial of
    service (panic). (CVE-2014-9090)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 LTS:
      linux-image-3.13.0-43-generic   3.13.0-43.72~precise1
      linux-image-3.13.0-43-generic-lpae  3.13.0-43.72~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-2445-1
      CVE-2014-3673, CVE-2014-3687, CVE-2014-3688, CVE-2014-7825,
      CVE-2014-7826, CVE-2014-8134, CVE-2014-8369, CVE-2014-9090
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-43.72~precise1
    
    
    
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