CVE-2022-46343

Se encontró una vulnerabilidad en X.Org. Este fallo de seguridad se produce porque el controlador de la solicitud ScreenSaverSetAttributes puede escribir en la memoria una vez liberada. Este problema puede provocar una elevación de privilegios locales en sistemas donde el servidor X ejecuta código privilegiado y remoto para sesiones de reenvío ssh X.

A vulnerability was found in X.Org. This issue occurs because the handler for the ScreenSaverSetAttributes request may write to memory after it has been freed. This flaw can lead to local privileges elevation on systems where the X server runs privileged and remote code execution for ssh X forwarding sessions.

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 ScreenSaverSetAttributes requests. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root.