ZDI-21-1548: X.Org Server SProcXFixesCreatePointerBarrier Out-Of-Bounds Access Local Privilege Escalation Vulnerability
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 SProcXFixesCreatePointerBarrier requests. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root.
Affected Software
Event History
Frequently Asked Questions
What is the severity of ZDI-21-1548?
The severity of ZDI-21-1548 is high due to its potential for privilege escalation.
How do I fix ZDI-21-1548?
To fix ZDI-21-1548, update the X.Org Server to the latest version provided by the vendor.
Who is affected by ZDI-21-1548?
ZDI-21-1548 affects installations of X.Org Server where local attackers can exploit the vulnerability.
What type of vulnerability is ZDI-21-1548?
ZDI-21-1548 is a privilege escalation vulnerability that requires low-privileged code execution.
Is there a workaround for ZDI-21-1548?
The best workaround for ZDI-21-1548 is to restrict local access to the system until a patch can be applied.