Ubuntu 2394-1: Linux kernel (Trusty HWE) vulnerabilities

    Date30 Oct 2014
    CategoryUbuntu
    39
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2394-1
    October 30, 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:
    
    Nadav Amit reported that the KVM (Kernel Virtual Machine) mishandles
    noncanonical addresses when emulating instructions that change the rip
    (Instruction Pointer). A guest user with access to I/O or the MMIO can use
    this flaw to cause a denial of service (system crash) of the guest.
    (CVE-2014-3647)
    
    A flaw was discovered with the handling of the invept instruction in the
    KVM (Kernel Virtual Machine) subsystem of the Linux kernel. An unprivileged
    guest user could exploit this flaw to cause a denial of service (system
    crash) on the guest. (CVE-2014-3646)
    
    Lars Bull reported a race condition in the PIT (programmable interrupt
    timer) emulation in the KVM (Kernel Virtual Machine) subsystem of the Linux
    kernel. A local guest user with access to PIT i/o ports could exploit this
    flaw to cause a denial of service (crash) on the host. (CVE-2014-3611)
    
    Lars Bull and Nadav Amit reported a flaw in how KVM (the Kernel Virtual
    Machine) handles noncanonical writes to certain MSR registers. A privileged
    guest user can exploit this flaw to cause a denial of service (kernel
    panic) on the host. (CVE-2014-3610)
    
    Raphael Geissert reported a NULL pointer dereference in the Linux kernel's
    CIFS client. A remote CIFS server could cause a denial of service (system
    crash) or possibly have other unspecified impact by deleting IPC$ share
    during resolution of DFS referrals. (CVE-2014-7145)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 LTS:
      linux-image-3.13.0-39-generic   3.13.0-39.66~precise1
      linux-image-3.13.0-39-generic-lpae  3.13.0-39.66~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-2394-1
      CVE-2014-3610, CVE-2014-3611, CVE-2014-3646, CVE-2014-3647,
      CVE-2014-7145
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-39.66~precise1
    
    
    
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