Description
XDM in XFree86 opens a chooserFd TCP socket even when DisplayManager.requestPort is 0, which could allow remote attackers to connect to the port, in violation of the intended restrictions.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 3 | XFree86 +29 | 4.3.0-69.EL | RHSA-2004:478 |
Advisories 1
- RHSA-2004:478 Red Hat Security Advisory: XFree86 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- 12019 third-party-advisory
- xdm-socket-gain-access(16264) vdb-entry
- http://bugs.xfree86.org/show_bug.cgi?id=1376
- MDKSA-2004:073 vendor-advisory
- oval:org.mitre.oval:def:10161 vdb-entry signature
- GLSA-200407-05 vendor-advisory
- P-001 third-party-advisory government-resource
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=124900
- 10423 vdb-entry
- 1010306 vdb-entry
- 20040526 008: SECURITY FIX: May 26, 2004 vendor-advisory
- RHSA-2004:478 vendor-advisory