Description
Mozilla Firefox before 3.0.11, Thunderbird, and SeaMonkey do not check content policy before loading a script file into a XUL document, which allows remote attackers to bypass intended access restrictions via a crafted HTML document, as demonstrated by a "web bug" in an e-mail message, or web script or an advertisement in a web page.
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 |
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
- ADV-2009-1572 vdb-entry
- 35326 vdb-entry
- firefox-xul-security-bypass(51076) vdb-entry
- http://www.mozilla.org/security/announce/2009/mfsa2009-31.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=477979
- 55158 vdb-entry
- 35440 third-party-advisory
- FEDORA-2009-6411 vendor-advisory
- 35431 third-party-advisory
- 35331 third-party-advisory
- 35468 third-party-advisory
- oval:org.mitre.oval:def:9448 vdb-entry signature
- 35439 third-party-advisory
- FEDORA-2009-6366 vendor-advisory
- MDVSA-2009:141 vendor-advisory
- 35415 third-party-advisory
- 1022379 vdb-entry
- RHSA-2009:1095 vendor-advisory
- SSA:2009-167-01 vendor-advisory
- DSA-1820 vendor-advisory
- 264308 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=503582