Dangling Pointer Vulnerability in X.Org Leading to Local Privilege Escalation and Remote Code Execution
CVE-2023-0494

7.8HIGH

Key Information:

Vendor

X.org

Status
Xorg-x11-server
Vendor
CVE Published:
27 March 2023

What is CVE-2023-0494?

A vulnerability exists within X.Org due to a dangling pointer in the DeepCopyPointerClasses function. This flaw allows attackers to exploit methods such as ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() to manipulate freed memory. As a result, this could enable local privilege elevation on systems where the X server is run with elevated privileges, as well as potential remote code execution through SSH X forwarding sessions. Users are encouraged to update to patched versions to mitigate these risks and enhance their system's security.

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Affected Version(s)

xorg-x11-server xorg-server 21.1.7

References

https://bugzilla.redhat.com/show_bug.cgi?id=2165995
https://lists.x.org/archives/xorg-announce/2023-February/...
https://gitlab.freedesktop.org/xorg/xserver/-/commit/0ba6...

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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