xorg-x11-server: Improper Protection for Outbound Error Messages and Alert Signals
CVE-2022-2319 is a high-severity improper protection for outbound error messages and alert signals vulnerability in xorg-x11-server, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. Affected xorg-x11-server versions: xorg-x11-server 21.1. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.47% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of xorg-x11-server you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Xorg-x11-server | xorg-x11-server | xorg-x11-server 21.1 | Not stated |
| X.Org | X Server | 21.1.0 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
Official description
A flaw was found in the Xorg-x11-server. An out-of-bounds access issue can occur in the ProcXkbSetGeometry function due to improper validation of the request length.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Protection for Outbound Error Messages and Alert Signals
Untrusted agents can disable alerts about signal conditions exceeding limits or the response mechanism that handles such alerts.
How developers prevent this class of flaw
- Alert signals generated by critical events should be protected from access by untrusted agents. Only hardware or trusted firmware modules should be able to alter the alert configuration.
More Improper Protection for Outbound Error Messages and Alert Signals vulnerabilities (CWE-1320)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- gitlab.freedesktop.org/xorg/xserver/-/merge_requests/938Third Party Advisory
- gitlab.freedesktop.org/xorg/xserver/-/merge_requests/939Third Party Advisory
- lists.freedesktop.org/archives/xorg-announce/2022-July/003192.htmlThird Party Advisory
Third-party and government advisories
- security.gentoo.org/glsa/202210-30Third Party Advisory
- security.netapp.com/advisory/ntap-20221104-0003/Third Party Advisory
- zerodayinitiative.com/advisories/ZDI-22-964/Third Party Advisory, VDB Entry
Other vulnerabilities in xorg-x11-server
- 7.8 High severity
- 7.8 High severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
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