CVE-2021-4010: X.Org Server SProcScreenSaverSuspend Out-Of-Bounds Access Local Privilege Escalation Vulnerability
A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcScreenSaverSuspend function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Other sources
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 SProcScreenSaverSuspend 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.
— ZDI
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2021-4010?
CVE-2021-4010 is a vulnerability in X.Org Server that allows local attackers to escalate privileges.
How can this vulnerability be exploited?
To exploit CVE-2021-4010, an attacker must first execute low-privileged code on the target system.
Is there a specific version of X.Org Server affected by this vulnerability?
Yes, X.Org Server 2:1.20.13-1ubuntu2 and earlier versions are affected by CVE-2021-4010.
How can I fix this vulnerability in X.Org Server?
To fix CVE-2021-4010, update X.Org Server to version 2:1.20.13-1ubuntu2 or apply the recommended security patches.
What is the severity of CVE-2021-4010?
CVE-2021-4010 has a severity rating of 7.8 (High).