Ubuntu 2563-1: Linux kernel vulnerabilities

    Date08 Apr 2015
    CategoryUbuntu
    64
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2563-1
    April 08, 2015
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    Sun Baoliang discovered a use after free flaw in the Linux kernel's SCTP
    (Stream Control Transmission Protocol) subsystem during INIT collisions. A
    remote attacker could exploit this flaw to cause a denial of service
    (system crash) or potentially escalate their privileges on the system.
    (CVE-2015-1421)
    
    Marcelo Leitner discovered a flaw in the Linux kernel's routing of packets
    to too many different dsts/too fast. A remote attacker can exploit this
    flaw to cause a denial of service (system crash). (CVE-2015-1465)
    
    An integer overflow was discovered in the stack randomization feature of
    the Linux kernel on 64 bit platforms. A local attacker could exploit this
    flaw to bypass the Address Space Layout Randomization (ASLR) mitigation
    mechanism. (CVE-2015-1593)
    
    An information leak was discovered in the Linux kernel's handling of
    userspace configuration of the link layer control (LLC). A local user could
    exploit this flaw to read data from other sysctl settings. (CVE-2015-2041)
    
    An information leak was discovered in how the Linux kernel handles setting
    the Reliable Datagram Sockets (RDS) settings. A local user could exploit
    this flaw to read data from other sysctl settings. (CVE-2015-2042)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-3.13.0-49-generic   3.13.0-49.81
      linux-image-3.13.0-49-generic-lpae  3.13.0-49.81
      linux-image-3.13.0-49-lowlatency  3.13.0-49.81
      linux-image-3.13.0-49-powerpc-e500  3.13.0-49.81
      linux-image-3.13.0-49-powerpc-e500mc  3.13.0-49.81
      linux-image-3.13.0-49-powerpc-smp  3.13.0-49.81
      linux-image-3.13.0-49-powerpc64-emb  3.13.0-49.81
      linux-image-3.13.0-49-powerpc64-smp  3.13.0-49.81
    
    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-2563-1
      CVE-2015-1421, CVE-2015-1465, CVE-2015-1593, CVE-2015-2041,
      CVE-2015-2042
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.13.0-49.81
    
    
    
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