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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3104
                USN-4488-2: X.Org X Server vulnerabilities
                             10 September 2020

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

Product:           X.Org X Server
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Increased Privileges     -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-14362 CVE-2020-14361 CVE-2020-14347
                   CVE-2020-14346 CVE-2020-14345 

Reference:         ESB-2020.3068
                   ESB-2020.3018
                   ESB-2020.2958
                   ESB-2020.2914

Original Bulletin: 
   https://usn.ubuntu.com/4488-2/

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USN-4488-2: X.Org X Server vulnerabilities
09 September 2020

Several security issues were fixed in X.Org X Server.
Releases

  o Ubuntu 14.04 ESM

Packages

  o xorg-server - X.Org X11 server

Details

USN-4488-1 fixed several vulnerabilities in X.Org. This update provides
the corresponding update and also the update from USN-4490-1 for Ubuntu 14.04
ESM.

Original advisory details:

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
input extension protocol. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14346)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly initialized
memory. A local attacker could possibly use this issue to obtain sensitive
information. (CVE-2020-14347)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XkbSelectEvents function. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14361)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XRecordRegisterClients function. A local attacker could possibly use this
issue to escalate privileges. (CVE-2020-14362)

Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled the
XkbSetNames function. A local attacker could possibly use this issue to
escalate privileges. (CVE-2020-14345)

Update instructions

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

Ubuntu 14.04

  o xserver-xorg-core - 2:1.15.1-0ubuntu2.11+esm2

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

References

  o CVE-2020-14345
  o CVE-2020-14346
  o CVE-2020-14347
  o CVE-2020-14361
  o CVE-2020-14362

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