Ubuntu 2792-1: Linux kernel vulnerabilities

    Date05 Nov 2015
    CategoryUbuntu
    72
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2792-1
    November 05, 2015
    
    linux 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: Linux kernel
    
    Details:
    
    Dmitry Vyukov discovered that the Linux kernel did not properly initialize
    IPC object state in certain situations. A local attacker could use this to
    escalate their privileges, expose confidential information, or cause a
    denial of service (system crash). (CVE-2015-7613)
    
    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 in certain situations, a directory could be renamed
    outside of a bind mounted location. An attacker could use this to escape
    bind mount containment and gain access to sensitive information.
    (CVE-2015-2925)
    
    Moein Ghasemzadeh discovered that the USB WhiteHEAT serial driver contained
    hardcoded attributes about the USB devices. An attacker could construct a
    fake WhiteHEAT USB device that, when inserted, causes a denial of service
    (system crash). (CVE-2015-5257)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 LTS:
      linux-image-3.2.0-93-generic    3.2.0-93.133
      linux-image-3.2.0-93-generic-pae  3.2.0-93.133
      linux-image-3.2.0-93-highbank   3.2.0-93.133
      linux-image-3.2.0-93-omap       3.2.0-93.133
      linux-image-3.2.0-93-powerpc-smp  3.2.0-93.133
      linux-image-3.2.0-93-powerpc64-smp  3.2.0-93.133
      linux-image-3.2.0-93-virtual    3.2.0-93.133
    
    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-2792-1
      CVE-2015-0272, CVE-2015-2925, CVE-2015-5257, CVE-2015-7613
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.2.0-93.133
    
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