Ubuntu 3487-1: Linux kernel vulnerabilities

    Date21 Nov 2017
    CategoryUbuntu
    93
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3487-1
    November 21, 2017
    
    linux, linux-raspi2 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 17.10
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    
    Details:
    
    It was discovered that the KVM subsystem in the Linux kernel did not
    properly keep track of nested levels in guest page tables. A local attacker
    in a guest VM could use this to cause a denial of service (host OS crash)
    or possibly execute arbitrary code in the host OS. (CVE-2017-12188)
    
    It was discovered that on the PowerPC architecture, the kernel did not
    properly sanitize the signal stack when handling sigreturn(). A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2017-1000255)
    
    Bo Zhang discovered that the netlink wireless configuration interface in
    the Linux kernel did not properly validate attributes when handling certain
    requests. A local attacker with the CAP_NET_ADMIN could use this to cause a
    denial of service (system crash). (CVE-2017-12153)
    
    It was discovered that the nested KVM implementation in the Linux kernel in
    some situations did not properly prevent second level guests from reading
    and writing the hardware CR8 register. A local attacker in a guest could
    use this to cause a denial of service (system crash). (CVE-2017-12154)
    
    Vitaly Mayatskikh discovered that the SCSI subsystem in the Linux kernel
    did not properly track reference counts when merging buffers. A local
    attacker could use this to cause a denial of service (memory exhaustion).
    (CVE-2017-12190)
    
    It was discovered that the key management subsystem in the Linux kernel did
    not properly restrict key reads on negatively instantiated keys. A local
    attacker could use this to cause a denial of service (system crash).
    (CVE-2017-12192)
    
    It was discovered that the ATI Radeon framebuffer driver in the Linux
    kernel did not properly initialize a data structure returned to user space.
    A local attacker could use this to expose sensitive information (kernel
    memory). (CVE-2017-14156)
    
    ChunYu Wang discovered that the iSCSI transport implementation in the Linux
    kernel did not properly validate data structures. A local attacker could
    use this to cause a denial of service (system crash). (CVE-2017-14489)
    
    Alexander Potapenko discovered an information leak in the waitid
    implementation of the Linux kernel. A local attacker could use this to
    expose sensitive information (kernel memory). (CVE-2017-14954)
    
    It was discovered that a race condition existed in the ALSA subsystem of
    the Linux kernel when creating and deleting a port via ioctl(). A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2017-15265)
    
    Dmitry Vyukov discovered that the Floating Point Unit (fpu) subsystem in
    the Linux kernel did not properly handle attempts to set reserved bits in a
    task's extended state (xstate) area. A local attacker could use this to
    cause a denial of service (system crash). (CVE-2017-15537)
    
    It was discovered that a race condition existed in the packet fanout
    implementation in the Linux kernel. A local attacker could use this to
    cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2017-15649)
    
    Andrey Konovalov discovered a use-after-free vulnerability in the USB
    serial console driver in the Linux kernel. A physically proximate attacker
    could use this to cause a denial of service (system crash) or possibly
    execute arbitrary code. (CVE-2017-16525)
    
    Andrey Konovalov discovered that the Ultra Wide Band driver in the Linux
    kernel did not properly check for an error condition. A physically
    proximate attacker could use this to cause a denial of service (system
    crash) or possibly execute arbitrary code. (CVE-2017-16526)
    
    Andrey Konovalov discovered that the ALSA subsystem in the Linux kernel
    contained a use-after-free vulnerability. A local attacker could use this
    to cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2017-16527)
    
    Andrey Konovalov discovered that the ALSA subsystem in the Linux kernel did
    not properly validate USB audio buffer descriptors. A physically proximate
    attacker could use this cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2017-16529)
    
    Andrey Konovalov discovered that the USB unattached storage driver in the
    Linux kernel contained out-of-bounds error when handling alternative
    settings. A physically proximate attacker could use to cause a denial of
    service (system crash) or possibly execute arbitrary code. (CVE-2017-16530)
    
    Andrey Konovalov discovered that the USB subsystem in the Linux kernel did
    not properly validate USB interface association descriptors. A physically
    proximate attacker could use this to cause a denial of service (system
    crash). (CVE-2017-16531)
    
    Andrey Konovalov discovered that the USB subsystem in the Linux kernel did
    not properly validate USB HID descriptors. A physically proximate attacker
    could use this to cause a denial of service (system crash).
    (CVE-2017-16533)
    
    Andrey Konovalov discovered that the USB subsystem in the Linux kernel did
    not properly validate CDC metadata. A physically proximate attacker could
    use this to cause a denial of service (system crash) or possibly execute
    arbitrary code. (CVE-2017-16534)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 17.10:
      linux-image-4.13.0-1006-raspi2  4.13.0-1006.6
      linux-image-4.13.0-17-generic   4.13.0-17.20
      linux-image-4.13.0-17-generic-lpae  4.13.0-17.20
      linux-image-4.13.0-17-lowlatency  4.13.0-17.20
      linux-image-generic             4.13.0.17.18
      linux-image-generic-lpae        4.13.0.17.18
      linux-image-lowlatency          4.13.0.17.18
      linux-image-raspi2              4.13.0.1006.4
    
    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://www.ubuntu.com/usn/usn-3487-1
      CVE-2017-1000255, CVE-2017-12153, CVE-2017-12154, CVE-2017-12188,
      CVE-2017-12190, CVE-2017-12192, CVE-2017-14156, CVE-2017-14489,
      CVE-2017-14954, CVE-2017-15265, CVE-2017-15537, CVE-2017-15649,
      CVE-2017-16525, CVE-2017-16526, CVE-2017-16527, CVE-2017-16529,
      CVE-2017-16530, CVE-2017-16531, CVE-2017-16533, CVE-2017-16534
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.13.0-17.20
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.13.0-1006.6
    
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