Description
The nsTextFrame::ClearTextRun function in layout/generic/nsTextFrameThebes.cpp in Mozilla Firefox 3.0.9 allows remote attackers to cause a denial of service (memory corruption) and probably execute arbitrary code via unspecified vectors. NOTE: this vulnerability reportedly exists because of an incorrect fix for CVE-2009-1302.
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 5 | firefox | 3.0.10-1.el5 | RHSA-2009:0449 |
| RHEL 5 | xulrunner +2 | 1.9.0.10-1.el5 | RHSA-2009:0449 |
| RHEL 4 | firefox | 3.0.10-1.el4 | RHSA-2009:0449 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
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 3.0.9 - 'nsTextFrame::ClearTextRun()' Remote Memory Corruption EDB-32961 · dos · Apr 27, 2009 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- RHSA-2009:0449 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- MDVSA-2009:111 vendor-advisory
- ADV-2009-1180 vdb-entry
- 34910 third-party-advisory
- 1022126 vdb-entry
- oval:org.mitre.oval:def:10446 vdb-entry signature
- 1022127 vdb-entry
- 34866 third-party-advisory
- 34743 vdb-entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=489676
- http://www.mozilla.org/security/announce/2009/mfsa2009-23.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=489647
- USN-765-1 vendor-advisory
- 34919 third-party-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=490233
- RHSA-2009:0449 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=497447
- SSA:2009-118-01 vendor-advisory
- 34851 third-party-advisory