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AUSCERT External Security Bulletin Redistribution
ESB-2020.3018
USN-4488-1: X.Org X Server vulnerabilities
3 September 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: 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
Reference: ESB-2020.2996
ESB-2020.2983
ESB-2020.2958
ESB-2020.2914
Original Bulletin:
https://usn.ubuntu.com/4488-1/
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USN-4488-1: X.Org X Server vulnerabilities
02 September 2020
Several security issues were fixed in X.Org X Server.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o xorg-server - X.Org X11 server
o xorg-server-hwe-16.04 - X.Org X11 server
o xorg-server-hwe-18.04 - X.Org X11 server
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)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o xserver-xorg-core - 2:1.20.8-2ubuntu2.3
Ubuntu 18.04
o xserver-xorg-core - 2:1.19.6-1ubuntu4.5
o xserver-xorg-core-hwe-18.04 - 2:1.20.8-2ubuntu2.2~18.04.2
Ubuntu 16.04
o xserver-xorg-core - 2:1.18.4-0ubuntu0.9
o xserver-xorg-core-hwe-16.04 - 2:1.19.6-1ubuntu4.1~16.04.3
After a standard system update you need to reboot your computer to make all
the necessary changes.
References
o CVE-2020-14346
o CVE-2020-14347
o CVE-2020-14361
o CVE-2020-14362
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