Ubuntu 1216-1: Linux kernel (EC2) vulnerabilities

    Date26 Sep 2011
    CategoryUbuntu
    43
    Posted ByLinuxSecurity Advisories
    Multiple kernel flaws have been fixed.
    ==========================================================================
    Ubuntu Security Notice USN-1216-1
    September 26, 2011
    
    linux-ec2 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 10.04 LTS
    
    Summary:
    
    Multiple kernel flaws have been fixed.
    
    Software Description:
    - linux-ec2: Linux kernel for EC2
    
    Details:
    
    Dan Rosenberg discovered that multiple terminal ioctls did not correctly
    initialize structure memory. A local attacker could exploit this to read
    portions of kernel stack memory, leading to a loss of privacy.
    (CVE-2010-4076, CVE-2010-4077)
    
    Alex Shi and Eric Dumazet discovered that the network stack did not
    correctly handle packet backlogs. A remote attacker could exploit this by
    sending a large amount of network traffic to cause the system to run out of
    memory, leading to a denial of service. (CVE-2010-4251, CVE-2010-4805)
    
    It was discovered that the /proc filesystem did not correctly handle
    permission changes when programs executed. A local attacker could hold open
    files to examine details about programs running with higher privileges,
    potentially increasing the chances of exploiting additional
    vulnerabilities. (CVE-2011-1020)
    
    Dan Rosenberg discovered that the X.25 Rose network stack did not correctly
    handle certain fields. If a system was running with Rose enabled, a remote
    attacker could send specially crafted traffic to gain root privileges.
    (CVE-2011-1493)
    
    Timo Warns discovered that the GUID partition parsing routines did not
    correctly validate certain structures. A local attacker with physical
    access could plug in a specially crafted block device to crash the system,
    leading to a denial of service. (CVE-2011-1577)
    
    Dan Rosenberg discovered that the IPv4 diagnostic routines did not
    correctly validate certain requests. A local attacker could exploit this to
    consume CPU resources, leading to a denial of service. (CVE-2011-2213)
    
    Vasiliy Kulikov discovered that taskstats listeners were not correctly
    handled. A local attacker could expoit this to exhaust memory and CPU
    resources, leading to a denial of service. (CVE-2011-2484)
    
    It was discovered that Bluetooth l2cap and rfcomm did not correctly
    initialize structures. A local attacker could exploit this to read portions
    of the kernel stack, leading to a loss of privacy. (CVE-2011-2492)
    
    Mauro Carvalho Chehab discovered that the si4713 radio driver did not
    correctly check the length of memory copies. If this hardware was
    available, a local attacker could exploit this to crash the system or gain
    root privileges. (CVE-2011-2700)
    
    Herbert Xu discovered that certain fields were incorrectly handled when
    Generic Receive Offload (CVE-2011-2723)
    
    The performance counter subsystem did not correctly handle certain
    counters. A local attacker could exploit this to crash the system, leading
    to a denial of service. (CVE-2011-2918)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 10.04 LTS:
      linux-image-2.6.32-318-ec2      2.6.32-318.38
    
    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-1216-1
      CVE-2010-4076, CVE-2010-4077, CVE-2010-4251, CVE-2010-4805,
      CVE-2011-1020, CVE-2011-1493, CVE-2011-1577, CVE-2011-2213,
      CVE-2011-2484, CVE-2011-2492, CVE-2011-2700, CVE-2011-2723,
      CVE-2011-2918
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-ec2/2.6.32-318.38
    
    
    
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