Description
Mozilla Firefox 3 before 3.0.11 associates an incorrect principal with a file: URL loaded through the location bar, which allows user-assisted remote attackers to bypass intended access restrictions and read files via a crafted HTML document, aka a "file-URL-to-file-URL scripting" attack.
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 5.0 | xulrunner | 1.9.0.11-0lenny1 | DSA-1820-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | firefox | 3.0.11-2.el5_3 | RHSA-2009:1095 |
| RHEL 5 | xulrunner +2 | 1.9.0.11-3.el5_3 | RHSA-2009:1095 |
| RHEL 4 | firefox | 3.0.11-4.el4 | RHSA-2009:1095 |
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
- Mozilla Firefox - Location Bar Spoofing EDB-10544 · local · Dec 18, 2009 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- RHSA-2009:1095 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1820-1 xulrunner - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=479943
- ADV-2009-1572 vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=503581
- oval:org.mitre.oval:def:9256 vdb-entry signature
- 35326 vdb-entry
- FEDORA-2009-6411 vendor-advisory
- http://www.mozilla.org/security/announce/2009/mfsa2009-30.html
- 35431 third-party-advisory
- 35331 third-party-advisory
- 35468 third-party-advisory
- FEDORA-2009-6366 vendor-advisory
- 35415 third-party-advisory
- RHSA-2009:1095 vendor-advisory
- 35386 vdb-entry
- SSA:2009-167-01 vendor-advisory
- 55163 vdb-entry
- DSA-1820 vendor-advisory
- 264308 vendor-advisory