Ubuntu 3620-2: Linux kernel (Trusty HWE) vulnerabilities

    Date04 Apr 2018
    CategoryUbuntu
    7478
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3620-2
    April 05, 2018
    
    linux-lts-trusty vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM
    
    Details:
    
    USN-3620-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
    12.04 ESM.
    
    Jann Horn discovered that microprocessors utilizing speculative execution
    and branch prediction may allow unauthorized memory reads via sidechannel
    attacks. This flaw is known as Spectre. A local attacker could use this to
    expose sensitive information, including kernel memory. (CVE-2017-5715)
    
    It was discovered that the netlink 802.11 configuration interface in the
    Linux kernel did not properly validate some attributes passed from
    userspace. A local attacker with the CAP_NET_ADMIN privilege could use this
    to cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2017-11089)
    
    It was discovered that a buffer overflow existed in the ioctl handling code
    in the ISDN subsystem of the Linux kernel. A local attacker could use this
    to cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2017-12762)
    
    It was discovered that the netfilter component of the Linux did not
    properly restrict access to the connection tracking helpers list. A local
    attacker could use this to bypass intended access restrictions.
    (CVE-2017-17448)
    
    Dmitry Vyukov discovered that the KVM implementation in the Linux kernel
    contained an out-of-bounds read when handling memory-mapped I/O. A local
    attacker could use this to expose sensitive information. (CVE-2017-17741)
    
    It was discovered that the Salsa20 encryption algorithm implementations in
    the Linux kernel did not properly handle zero-length inputs. A local
    attacker could use this to cause a denial of service (system crash).
    (CVE-2017-17805)
    
    It was discovered that the keyring implementation in the Linux kernel did
    not properly check permissions when a key request was performed on a
    task's default keyring. A local attacker could use this to add keys to
    unauthorized keyrings. (CVE-2017-17807)
    
    It was discovered that the Broadcom NetXtremeII ethernet driver in the
    Linux kernel did not properly validate Generic Segment Offload (GSO) packet
    sizes. An attacker could use this to cause a denial of service (interface
    unavailability). (CVE-2018-1000026)
    
    It was discovered that the Reliable Datagram Socket (RDS) implementation in
    the Linux kernel contained an out-of-bounds write during RDMA page
    allocation. An attacker could use this to cause a denial of service (system
    crash) or possibly execute arbitrary code. (CVE-2018-5332)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      linux-image-3.13.0-144-generic  3.13.0-144.193~precise1
      linux-image-3.13.0-144-generic-lpae  3.13.0-144.193~precise1
      linux-image-generic-lpae-lts-trusty  3.13.0.144.135
      linux-image-generic-lts-trusty  3.13.0.144.135
    
    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:
      https://usn.ubuntu.com/usn/usn-3620-2
      https://usn.ubuntu.com/usn/usn-3620-1
      CVE-2017-11089, CVE-2017-12762, CVE-2017-17448, CVE-2017-17741,
      CVE-2017-17805, CVE-2017-17807, CVE-2017-5715, CVE-2018-1000026,
      CVE-2018-5332
    
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