ESB-2017.1820 - [Ubuntu] xserver-xorg-core: Multiple vulnerabilities 2017-07-25

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1820
                      X.Org X server vulnerabilities
                               25 July 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           xserver-xorg-core
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise        -- Existing Account
                   Access Privileged Data -- Existing Account
                   Denial of Service      -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-10972 CVE-2017-10971 CVE-2017-2624

Reference:         ESB-2017.1715

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3362-1

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Ubuntu Security Notice USN-3362-1
July 24, 2017

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

It was discovered that the X.Org X server incorrectly handled endianness
conversion of certain X events. 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 as an administrator. (CVE-2017-10971)

It was discovered that the X.Org X server incorrectly handled endianness
conversion of certain X events. An attacker able to connect to an X server,
either locally or remotely, could use this issue to possibly obtain
sensitive information. (CVE-2017-10972)

Eric Sesterhenn discovered that the X.Org X server incorrectly compared
MIT cookies. An attacker could possibly use this issue to perform a timing
attack and recover the MIT cookie. (CVE-2017-2624)

Update instructions:

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

Ubuntu 17.04:
  xserver-xorg-core               2:1.19.3-1ubuntu1.1

Ubuntu 16.04 LTS:
  xserver-xorg-core               2:1.18.4-0ubuntu0.3
  xserver-xorg-core-hwe-16.04     2:1.18.4-1ubuntu6.1~16.04.2

Ubuntu 14.04 LTS:
  xserver-xorg-core               2:1.15.1-0ubuntu2.9
  xserver-xorg-core-lts-xenial    2:1.18.3-1ubuntu2.3~trusty2

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

References:
  https://www.ubuntu.com/usn/usn-3362-1
  CVE-2017-10971, CVE-2017-10972, CVE-2017-2624

Package Information:
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.19.3-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.18.4-0ubuntu0.3

https://launchpad.net/ubuntu/+source/xorg-server-hwe-16.04/2:1.18.4-1ubuntu6.1~16.04.2
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.15.1-0ubuntu2.9

https://launchpad.net/ubuntu/+source/xorg-server-lts-xenial/2:1.18.3-1ubuntu2.3~trusty2

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