Advisory Details

December 28th, 2022

X.Org Server XkbCopyNames Double Free Local Privilege Escalation Vulnerability

CVE ID	CVE-2022-4283
CVSS SCORE	7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	X.Org
AFFECTED PRODUCTS	Server
VULNERABILITY DETAILS	This vulnerability allows local attackers to escalate privileges on affected installations of X.Org Server. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of XkbCopyNames requests. The issue results from the lack of validating the existence of an object prior to performing further free operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root.
ADDITIONAL DETAILS	https://lists.x.org/archives/xorg-announce/2022-December/003302.html https://bugzilla.redhat.com/show_bug.cgi?id=2151761
DISCLOSURE TIMELINE	2022-12-02 - Vulnerability reported to vendor 2022-12-28 - Coordinated public release of advisory 2023-12-04 - Advisory Updated
CREDIT	Jan-Niklas Sohn

BACK TO ADVISORIES