Description
Buffer overflow in the ReadFontAlias function in XFree86 4.1.0 to 4.3.0, when using the CopyISOLatin1Lowered function, allows local or remote authenticated users to execute arbitrary code via a malformed entry in the font alias (font.alias) file, a different vulnerability than CVE-2004-0083 and CVE-2004-0106.
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 3.0 | xfree86 | 4.1.0-16woody3 | DSA-443 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 3 | XFree86 +28 | 4.3.0-55.EL | RHSA-2004:061 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- XFree86 4.x - CopyISOLatin1Lowered Font_Name Buffer Overflow EDB-23690 · dos · Feb 12, 2004 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- RHSA-2004:061 Red Hat Security Advisory: XFree86 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-443 xfree86 - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- oval:org.mitre.oval:def:831 vdb-entry signature
- SuSE-SA:2004:006 vendor-advisory
- VU#667502 third-party-advisory
- RHSA-2004:060 vendor-advisory
- 57768 vendor-advisory
- CLA-2004:821 vendor-advisory
- xfree86-copyisolatin1lLowered-bo(15200) vdb-entry
- oval:org.mitre.oval:def:807 vdb-entry signature
- FLSA:2314 vendor-advisory
- DSA-443 vendor-advisory
- 20040212 iDEFENSE Security Advisory 02.11.04: XFree86 Font Information File Buffer Overflow II mailing-list
- oval:org.mitre.oval:def:10405 vdb-entry signature
- 9652 vdb-entry
- MDKSA-2004:012 vendor-advisory
- http://www.idefense.com/application/poi/display?id=73
- RHSA-2004:059 vendor-advisory
- RHSA-2004:061 vendor-advisory
- SSA:2004-043 vendor-advisory