ZDI-20-1419: X.Org Server XRecordRegisterClients Integer Underflow 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 XRecordRegisterClients requests. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of root.
Affected Software
Event History
Frequently Asked Questions
What is the severity of ZDI-20-1419?
The severity of ZDI-20-1419 is considered critical due to the potential for local privilege escalation.
How do I fix ZDI-20-1419?
To fix ZDI-20-1419, users should update their X.Org Server to the latest version provided by the vendor.
Who is affected by ZDI-20-1419?
ZDI-20-1419 affects installations of X.Org Server where local attackers can execute low-privileged code.
What type of vulnerability is ZDI-20-1419?
ZDI-20-1419 is a local privilege escalation vulnerability.
What is required to exploit ZDI-20-1419?
An attacker must first obtain the ability to execute low-privileged code on the target system to exploit ZDI-20-1419.