Ubuntu 2516-1: Linux kernel vulnerabilities

    Date26 Feb 2015
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    Ubuntu Security Notice USN-2516-1
    February 26, 2015
    linux vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 14.04 LTS
    Several security issues were fixed in the kernel.
    Software Description:
    - linux: Linux kernel
    A flaw was discovered in the Kernel Virtual Machine's (KVM) emulation of
    the SYSTENTER instruction when the guest OS does not initialize the
    SYSENTER MSRs. A guest OS user could exploit this flaw to cause a denial of
    service of the guest OS (crash) or potentially gain privileges on the guest
    OS. (CVE-2015-0239)
    Andy Lutomirski discovered an information leak in the Linux kernel's Thread
    Local Storage (TLS) implementation allowing users to bypass the espfix to
    obtain information that could be used to bypass the Address Space Layout
    Randomization (ASLR) protection mechanism. A local user could exploit this
    flaw to obtain potentially sensitive information from kernel memory.
    A restriction bypass was discovered in iptables when conntrack rules are
    specified and the conntrack protocol handler module is not loaded into the
    Linux kernel. This flaw can cause the firewall rules on the system to be
    bypassed when conntrack rules are used. (CVE-2014-8160)
    A flaw was discovered with file renaming in the linux kernel. A local user
    could exploit this flaw to cause a denial of service (deadlock and system
    hang). (CVE-2014-8559)
    A flaw was discovered in how supplemental group memberships are handled in
    certain namespace scenarios. A local user could exploit this flaw to bypass
    file permission restrictions. (CVE-2014-8989)
    A flaw was discovered in how Thread Local Storage (TLS) is handled by the
    task switching function in the Linux kernel for x86_64 based machines. A
    local user could exploit this flaw to bypass the Address Space Layout
    Radomization (ASLR) protection mechanism. (CVE-2014-9419)
    Prasad J Pandit reported a flaw in the rock_continue function of the Linux
    kernel's ISO 9660 CDROM file system. A local user could exploit this flaw
    to cause a denial of service (system crash or hang). (CVE-2014-9420)
    A flaw was discovered in the fragment handling of the B.A.T.M.A.N. Advanced
    Meshing Protocol in the Linux kernel. A remote attacker could exploit this
    flaw to cause a denial of service (mesh-node system crash) via fragmented
    packets. (CVE-2014-9428)
    A race condition was discovered in the Linux kernel's key ring. A local
    user could cause a denial of service (memory corruption or panic) or
    possibly have unspecified impact via the keyctl commands. (CVE-2014-9529)
    A memory leak was discovered in the ISO 9660 CDROM file system when parsing
    rock ridge ER records. A local user could exploit this flaw to obtain
    sensitive information from kernel memory via a crafted iso9660 image.
    A flaw was discovered in the Address Space Layout Randomization (ASLR) of
    the Virtual Dynamically linked Shared Objects (vDSO) location. This flaw
    makes it easier for a local user to bypass the ASLR protection mechanism.
    Dmitry Chernenkov discovered a buffer overflow in eCryptfs' encrypted file
    name decoding. A local unprivileged user could exploit this flaw to cause a
    denial of service (system crash) or potentially gain administrative
    privileges. (CVE-2014-9683)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 14.04 LTS:
      linux-image-3.13.0-46-generic   3.13.0-46.75
      linux-image-3.13.0-46-generic-lpae  3.13.0-46.75
      linux-image-3.13.0-46-lowlatency  3.13.0-46.75
      linux-image-3.13.0-46-powerpc-e500  3.13.0-46.75
      linux-image-3.13.0-46-powerpc-e500mc  3.13.0-46.75
      linux-image-3.13.0-46-powerpc-smp  3.13.0-46.75
      linux-image-3.13.0-46-powerpc64-emb  3.13.0-46.75
      linux-image-3.13.0-46-powerpc64-smp  3.13.0-46.75
    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.
      CVE-2014-8133, CVE-2014-8160, CVE-2014-8559, CVE-2014-8989,
      CVE-2014-9419, CVE-2014-9420, CVE-2014-9428, CVE-2014-9529,
      CVE-2014-9584, CVE-2014-9585, CVE-2014-9683, CVE-2015-0239
    Package Information:
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