Description
Use-after-free vulnerability in Mozilla Firefox before 3.5.19 and 3.6.x before 3.6.17, and SeaMonkey before 2.0.14, allows remote attackers to execute arbitrary code via vectors related to OBJECT's mChannel.
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 6.0 | iceape | 2.0.11-5 | DSA-2227-1 |
| Debian 6.0 | icedove | 3.0.11-1+squeeze2 | DSA-2235-1 |
| Debian 6.0 | iceweasel | 3.5.16-7 | DSA-2228-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | firefox | 3.6.17-1.el6_0 | RHSA-2011:0471 |
| RHEL 6 | xulrunner +1 | 1.9.2.17-4.el6_0 | RHSA-2011:0471 |
| RHEL 5 | firefox | 3.6.17-1.el5_6 | RHSA-2011:0471 |
| RHEL 5 | xulrunner +1 | 1.9.2.17-3.el5_6 | RHSA-2011:0471 |
| RHEL 4 | firefox | 3.6.17-2.el4 | RHSA-2011:0471 |
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.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Metasploit 2 modules
-
Mozilla Firefox 3.6.16 mChannel Use-After-Free
exploit/osx/browser/mozilla_mchannel
-
Mozilla Firefox 3.6.16 mChannel Use-After-Free Vulnerability
exploit/windows/browser/mozilla_mchannel
Exploit-DB 4
- Mozilla Firefox 3.6.16 (OSX) - mChannel Use-After-Free (Metasploit) (2) EDB-18377 · remote · Jan 17, 2012 · verified
- Mozilla Firefox 3.6.16 (Windows 7) - mChannel Object Use-After-Free EDB-17672 · remote · Aug 16, 2011 · verified
- Mozilla Firefox 3.6.16 (Windows) - mChannel Use-After-Free (Metasploit) (1) EDB-17650 · remote · Aug 10, 2011 · verified
- Mozilla Firefox 3.6.16 - OBJECT mChannel Remote Code Execution (DEP Bypass) (Metasploit) EDB-17612 · remote · Aug 5, 2011 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 4
- RHSA-2011:0471 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-2227-1 iceape - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2228-1 iceweasel - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2235-1 icedove - several Debian Security (DSA / DLA) · Mar 9, 2026
References
- DSA-2228 vendor-advisory
- 8340 third-party-advisory
- MDVSA-2011:079 vendor-advisory
- http://www.mozilla.org/security/announce/2011/mfsa2011-13.html
- 8331 third-party-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=634986
- DSA-2235 vendor-advisory
- oval:org.mitre.oval:def:14142 vdb-entry signature
- DSA-2227 vendor-advisory
- 8326 third-party-advisory
- http://downloads.avaya.com/css/P8/documents/100144158