Ubuntu 2779-1: Linux kernel vulnerabilities

    Date20 Oct 2015
    CategoryUbuntu
    32
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2779-1
    October 20, 2015
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 15.04
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    It was discovered that the Linux kernel did not check if a new IPv6 MTU set
    by a user space application was valid. A remote attacker could forge a
    route advertisement with an invalid MTU that a user space daemon like
    NetworkManager would honor and apply to the kernel, causing a denial of
    service. (CVE-2015-0272)
    
    It was discovered that virtio networking in the Linux kernel did not handle
    fragments correctly, leading to kernel memory corruption. A remote attacker
    could use this to cause a denial of service (system crash) or possibly
    execute code with administrative privileges. (CVE-2015-5156)
    
    It was discovered that the Reliable Datagram Sockets (RDS) implementation
    in the Linux kernel did not verify sockets were properly bound before
    attempting to send a message, which could cause a NULL pointer dereference.
    An attacker could use this to cause a denial of service (system crash).
    (CVE-2015-6937)
    
    Ben Hutchings discovered that the Advanced Union Filesystem (aufs) for the
    Linux kernel did not correctly handle references of memory mapped files
    from an aufs mount. A local attacker could use this to cause a denial of
    service (system crash) or possibly execute arbitrary code with
    administrative privileges. (CVE-2015-7312)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 15.04:
      linux-image-3.19.0-31-generic   3.19.0-31.36
      linux-image-3.19.0-31-generic-lpae  3.19.0-31.36
      linux-image-3.19.0-31-lowlatency  3.19.0-31.36
      linux-image-3.19.0-31-powerpc-e500mc  3.19.0-31.36
      linux-image-3.19.0-31-powerpc-smp  3.19.0-31.36
      linux-image-3.19.0-31-powerpc64-emb  3.19.0-31.36
      linux-image-3.19.0-31-powerpc64-smp  3.19.0-31.36
    
    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-2779-1
      CVE-2015-0272, CVE-2015-5156, CVE-2015-6937, CVE-2015-7312
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.19.0-31.36
    
    
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