[ASA-202012-6] xorg-server: arbitrary code execution

[Remi Gacogne]

Arch Linux Security Advisory ASA-202012-6
=========================================

Severity: Medium
Date    : 2020-12-05
CVE-ID  : CVE-2020-14360 CVE-2020-25712
Package : xorg-server
Type    : arbitrary code execution
Remote  : No
Link    : https://security.archlinux.org/AVG-1310

Summary
=======

The package xorg-server before version 1.20.10-1 is vulnerable to
arbitrary code execution.

Resolution
==========

Upgrade to 1.20.10-1.

# pacman -Syu "xorg-server>=1.20.10-1"

The problems have been fixed upstream in version 1.20.10.

Workaround
==========

None.

Description
===========

- CVE-2020-14360 (arbitrary code execution)

A security issue was discovered in xorg-server before 1.20.10.
Insufficient checks on the lengths of the XkbSetMap request can lead to
out of bounds memory accesses in the X server. This issue can lead to
privilege escalation for authorized clients on systems where the X
server is running privileged.

- CVE-2020-25712 (arbitrary code execution)

A security issue was discovered in xorg-server before 1.20.10.
Insufficient checks on input of the XkbSetDeviceInfo request can lead
to a buffer overflow on the head in the X server. This issue can lead
to privilege escalation for authorized clients on systems where the X
server is running privileged.

Impact
======

A local attacker might be able to escalate privileges.

References
==========

https://www.openwall.com/lists/oss-security/2020/12/01/3
https://gitlab.freedesktop.org/xorg/xserver/-/commit/446ff2d3177087b8173fa779fa5b77a2a128988b
https://gitlab.freedesktop.org/xorg/xserver/-/commit/87c64fc5b0db9f62f4e361444f4b60501ebf67b9
https://security.archlinux.org/CVE-2020-14360
https://security.archlinux.org/CVE-2020-25712
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