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Ubuntu 18.04 LTS USN-3802-1: X.Org File Overwrite Risk Advisory

ubuntu
Calendar Grey October 26, 2018
Dist Ubuntu Esm H88
The X.Org X server in Ubuntu is vulnerable, potentially enabling local threats to modify files. It's crucial to implement updates to minimize risks.
X.Org X server could be made to overwrite files as the administrator.

Summary

X.Org X server could be made to overwrite files as the administrator.

Software Description:

- xorg-server: X.Org X11 server

- xorg-server-hwe-16.04: X.Org X11 server

Details:

Narendra Shinde discovered that the X.Org X server incorrectly handled

certain command line parameters when running as root with the legacy

wrapper. When certain graphics drivers are being used, a local attacker

could possibly use this issue to overwrite arbitrary files and escalate

privileges.

Topics%20covered

Topics Covered

security advisory file overwrite Ubuntu local attack update instruction xorg-server

Update Instructions

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

Ubuntu 18.10:
  xserver-xorg-core               2:1.20.1-3ubuntu2.1

Ubuntu 18.04 LTS:
  xserver-xorg-core               2:1.19.6-1ubuntu4.2

Ubuntu 16.04 LTS:
  xserver-xorg-core-hwe-16.04     2:1.19.6-1ubuntu4.1~16.04.2

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

References

https://ubuntu.com/security/notices/USN-3802-1

CVE-2018-14665

Severity
important
Lowest
Low
Medium
High
Critical

October 26, 2018

Topics%20covered

Topics Covered

security advisory file overwrite Ubuntu local attack update instruction xorg-server

Package Information

https://launchpad.net/ubuntu/+source/xorg-server/2:1.20.1-3ubuntu2.1
https://launchpad.net/ubuntu/+source/xorg-server/2:1.19.6-1ubuntu4.2
https://launchpad.net/ubuntu/+source/xorg-server-hwe-16.04/2:1.19.6-1ubuntu4.1~16.04.2

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