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Fencer Intel
low 1.9

CVE-2011-4029 json

The LockServer function in os/utils.c in X.Org xserver before 1.11.2 allows local users to change the permissions of arbitrary files to 444…

published 2012-07-03 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-3982

cvss
1.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
1
Exploit-DB

Summary

The LockServer function in os/utils.c in X.Org xserver before 1.11.2 allows local users to change the permissions of arbitrary files to 444, read those files, and possibly cause a denial of service (removed execution permission) via a symlink attack on a temporary lock file.

Patch / fix

  • xorg-server Debian 14, Debian 13, Debian 12 2:1.11.1.901-2

debian advisories DEBIAN-CVE-2011-4029

  • xorg-x11-server RHEL 6 1.10.6-1.el6
  • xorg-x11-server-Xdmx RHEL 6 1.10.6-1.el6
  • xorg-x11-server-Xorg RHEL 6 1.10.6-1.el6
  • xorg-x11-server-Xvfb RHEL 6 1.10.6-1.el6
  • xorg-x11-server-Xnest RHEL 6 1.10.6-1.el6
  • xorg-x11-server-common RHEL 6 1.10.6-1.el6
  • xorg-x11-server-source RHEL 6 1.10.6-1.el6
  • xorg-x11-server-Xephyr RHEL 6 1.10.6-1.el6

red hat advisories RHSA-2012:0939

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-4029 updated cvss 4.0

xorg-x11-server: lock file chmod change race condition

  • Red Hat Enterprise Linux 4 xorg-x11
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Desktop (v. 6) xorg-x11-server 1.10.6-1.el6, xorg-x11-server-Xorg 1.10.6-1.el6, xorg-x11-server-common 1.10.6-1.el6, xorg-x11-server-Xephyr 1.10.6-1.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) xorg-x11-server 1.10.6-1.el6, xorg-x11-server-Xdmx 1.10.6-1.el6, xorg-x11-server-Xvfb 1.10.6-1.el6, xorg-x11-server-Xnest 1.10.6-1.el6, xorg-x11-server-source 1.10.6-1.el6 Red Hat Enterprise Linux HPC Node Optional (v. 6) xorg-x11-server 1.10.6-1.el6, xorg-x11-server-Xdmx 1.10.6-1.el6, xorg-x11-server-Xorg 1.10.6-1.el6, xorg-x11-server-Xvfb 1.10.6-1.el6, xorg-x11-server-Xnest 1.10.6-1.el6, xorg-x11-server-common 1.10.6-1.el6, +2 more Red Hat Enterprise Linux Server (v. 6) xorg-x11-server 1.10.6-1.el6, xorg-x11-server-Xorg 1.10.6-1.el6, xorg-x11-server-common 1.10.6-1.el6, xorg-x11-server-Xephyr 1.10.6-1.el6 Red Hat Enterprise Linux Server Optional (v. 6) xorg-x11-server 1.10.6-1.el6, xorg-x11-server-Xdmx 1.10.6-1.el6, xorg-x11-server-Xvfb 1.10.6-1.el6, xorg-x11-server-Xnest 1.10.6-1.el6, xorg-x11-server-source 1.10.6-1.el6 Red Hat Enterprise Linux Workstation (v. 6) xorg-x11-server 1.10.6-1.el6, xorg-x11-server-Xorg 1.10.6-1.el6, xorg-x11-server-common 1.10.6-1.el6, xorg-x11-server-Xephyr 1.10.6-1.el6
    +1 more products
    Red Hat Enterprise Linux Workstation Optional (v. 6) xorg-x11-server 1.10.6-1.el6, xorg-x11-server-Xdmx 1.10.6-1.el6, xorg-x11-server-Xvfb 1.10.6-1.el6, xorg-x11-server-Xnest 1.10.6-1.el6, xorg-x11-server-source 1.10.6-1.el6
    fixed: vendor fix RHSA-2012:0939
  • Red Hat Enterprise Linux 5 xorg-x11-server
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-18040)
  2. Published

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-18040 X.Org xorg 1.4 < 1.11.2 - File Permission Change local, 2011-10-28

CVSS scores

assigned by version score vector
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.