Ubuntu 2890-3: Linux kernel (Raspberry Pi 2) vulnerabilities

    Date01 Feb 2016
    CategoryUbuntu
    49
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2890-3
    February 02, 2016
    
    linux-raspi2 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 15.10
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    
    Details:
    
    It was discovered that a use-after-free vulnerability existed in the
    AF_UNIX implementation in the Linux kernel. A local attacker could use
    crafted epoll_ctl calls to cause a denial of service (system crash) or
    expose sensitive information. (CVE-2013-7446)
    
    It was discovered that the KVM implementation in the Linux kernel did not
    properly restore the values of the Programmable Interrupt Timer (PIT). A
    user-assisted attacker in a KVM guest could cause a denial of service in
    the host (system crash). (CVE-2015-7513)
    
    It was discovered that the Linux kernel keyring subsystem contained a race
    between read and revoke operations. A local attacker could use this to
    cause a denial of service (system crash). (CVE-2015-7550)
    
    Sasha Levin discovered that the Reliable Datagram Sockets (RDS)
    implementation in the Linux kernel had a race condition when checking
    whether a socket was bound or not. A local attacker could use this to cause
    a denial of service (system crash). (CVE-2015-7990)
    
    It was discovered that the Btrfs implementation in the Linux kernel
    incorrectly handled compressed inline extants on truncation. A local
    attacker could use this to expose sensitive information. (CVE-2015-8374)
    
    郭永刚 discovered that the Linux kernel networking implementation did
    not validate protocol identifiers for certain protocol families, A local
    attacker could use this to cause a denial of service (system crash) or
    possibly gain administrative privileges. (CVE-2015-8543)
    
    Dmitry Vyukov discovered that the pptp implementation in the Linux kernel
    did not verify an address length when setting up a socket. A local attacker
    could use this to craft an application that exposed sensitive information
    from kernel memory. (CVE-2015-8569)
    
    David Miller discovered that the Bluetooth implementation in the Linux
    kernel did not properly validate the socket address length for Synchronous
    Connection-Oriented (SCO) sockets. A local attacker could use this to
    expose sensitive information. (CVE-2015-8575)
    
    It was discovered that the netfilter Network Address Translation (NAT)
    implementation did not ensure that data structures were initialized when
    handling IPv4 addresses. An attacker could use this to cause a denial of
    service (system crash). (CVE-2015-8787)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 15.10:
      linux-image-4.2.0-1022-raspi2   4.2.0-1022.29
    
    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.
    Unless you manually uninstalled the standard kernel metapackages
    (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
    linux-powerpc), a standard system upgrade will automatically perform
    this as well.
    
    References:
      http://www.ubuntu.com/usn/usn-2890-3
      http://www.ubuntu.com/usn/usn-2890-1
      CVE-2013-7446, CVE-2015-7513, CVE-2015-7550, CVE-2015-7990,
      CVE-2015-8374, CVE-2015-8543, CVE-2015-8569, CVE-2015-8575,
      CVE-2015-8787
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.2.0-1022.29
    
    
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