Ubuntu 2491-1: Linux kernel (EC2) vulnerabilities

    Date03 Feb 2015
    CategoryUbuntu
    38
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2491-1
    February 04, 2015
    
    linux-ec2 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 10.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-ec2: Linux kernel for EC2
    
    Details:
    
    Andy Lutomirski discovered that the Linux kernel does not properly handle
    faults associated with the Stack Segment (SS) register in the x86
    architecture. A local attacker could exploit this flaw to gain
    administrative privileges. (CVE-2014-9322)
    
    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)
    
    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.
    (CVE-2014-8133)
    
    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)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 10.04 LTS:
      linux-image-2.6.32-375-ec2      2.6.32-375.92
    
    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-2491-1
      CVE-2014-3610, CVE-2014-3611, CVE-2014-8133, CVE-2014-9322,
      CVE-2014-9420
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-ec2/2.6.32-375.92
    
    
    
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