Ubuntu update for xorg-server

1) Out-of-bounds read

EUVDB-ID: #VU46028

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-14345

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in XkbSetNames(). A local user can run a specially crafted program to trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Update the affected package xorg-server to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 20.04

xserver-xorg-core (Ubuntu package): before 2:1.18.4-0ubuntu0.10

xserver-xorg-core-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.3

xserver-xorg-core-hwe-16.04 (Ubuntu package): before 2:1.19.6-1ubuntu4.1~16.04.4

CPE2.3

• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:xserver-xorg-core_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:xserver-xorg-core-hwe-18.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:xserver-xorg-core-hwe-16.04_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-4490-1

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.