Use After Free in X.org X Server
CVE-2023-0494
A vulnerability was found in X.Org. This issue occurs due to a dangling pointer in DeepCopyPointerClasses that can be exploited by ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() to read and write into freed memory. This can lead to local privilege elevation on systems where the X server runs privileged and remote code execution for ssh X forwarding sessions.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (59.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- X.org X Server
- Fedoraproject Fedora — versions 36, 37
- Red Hat Enterprise Linux — versions 8.0, 8.1, 9.0
- Red Hat Enterprise Linux Aus — versions 8.4, 8.6
- Red Hat Enterprise Linux Desktop — versions 7.0
- Red Hat Enterprise Linux Eus — versions 8.4, 8.6, 9.0
- Red Hat Enterprise Linux For IBM Z Systems — versions 7.0, 8.0
- Red Hat Enterprise Linux For IBM Z Systems Eus — versions 8.4, 8.6
- Red Hat Enterprise Linux For Power Big Endian — versions 7.0
- Red Hat Enterprise Linux For Power Little Endian — versions 7.0, 8.0, 9.0
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- lists.x.org/archives/xorg-announce/2023-February/003320.html (Mailing List, Vendor Advisory)
- gitlab.freedesktop.org/xorg/xserver/-/commit/0ba6d8c37071131a49790243cdac55392e… (Patch)
- security.gentoo.org/glsa/202305-30 (vendor-advisory)
Frequently asked questions
- What is CVE-2023-0494?
- CVE-2023-0494 is a high-severity vulnerability in X.org X Server, classified under Use After Free. CVSS score: 7.8/10. Published 2023-03-27.
- How severe is CVE-2023-0494?
- High severity. CVSS v3 base score is 7.8 out of 10.