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Ubuntu Security Update USN-3453-1: X.Org X server vulnerabilities

Discussion in 'Linux Security Announcements (Automated)' started by LinuxBot, Oct 12, 2017.

  1. LinuxBot

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    Ubuntu Security Notice USN-3453-1


    12th October, 2017

    xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities


    A security issue affects these releases of Ubuntu and its derivatives:

    • Ubuntu 17.04
    • Ubuntu 16.04 LTS
    • Ubuntu 14.04 LTS
    Summary


    Several security issues were fixed in the X.Org X server.

    Software description

    • xorg-server - X.Org X11 server
    • xorg-server-hwe-16.04 - X.Org X11 server
    • xorg-server-lts-xenial - X.Org X11 server
    Details


    Michal Srb discovered that the X.Org X server incorrectly handled shared
    memory segments. An attacker able to connect to an X server, either locally
    or remotely, could use this issue to crash the server, or possibly replace
    shared memory segments of other X clients in the same session.
    (CVE-2017-13721)

    Michal Srb discovered that the X.Org X server incorrectly handled XKB
    buffers. An attacker able to connect to an X server, either locally or
    remotely, could use this issue to crash the server, or possibly execute
    arbitrary code. (CVE-2017-13723)



    Update instructions


    The problem can be corrected by updating your system to the following package version:

    Ubuntu 17.04:
    xserver-xorg-core 2:1.19.3-1ubuntu1.2
    Ubuntu 16.04 LTS:
    xserver-xorg-core 2:1.18.4-0ubuntu0.6
    xserver-xorg-core-hwe-16.04 2:1.19.3-1ubuntu1~16.04.3
    Ubuntu 14.04 LTS:
    xserver-xorg-core 2:1.15.1-0ubuntu2.10
    xserver-xorg-core-lts-xenial 2:1.18.3-1ubuntu2.3~trusty3

    To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

    After a standard system update you need to reboot your computer to make
    all the necessary changes.

    References


    CVE-2017-13721, CVE-2017-13723

    Continue reading...
     

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