Description
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode invisible characters when they are displayed in the location bar, which causes an incorrect address to be displayed and makes it easier for remote attackers to spoof URLs and conduct phishing attacks.
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 | 3.0.7-1.el5 | RHSA-2009:0315 |
| RHEL 5 | xulrunner +2 | 1.9.0.7-1.el5 | RHSA-2009:0315 |
| RHEL 4 | firefox | 3.0.7-1.el4 | RHSA-2009:0315 |
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 |
Advisories 3
- RHSA-2009:0315 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
- RHSA-2009:0315 vendor-advisory
- http://www.mozilla.org/security/announce/2009/mfsa2009-11.html
- SUSE-SA:2009:012 vendor-advisory
- oval:org.mitre.oval:def:11222 vdb-entry signature
- oval:org.mitre.oval:def:6157 vdb-entry signature
- ADV-2009-0632 vdb-entry
- oval:org.mitre.oval:def:6039 vdb-entry signature
- oval:org.mitre.oval:def:6229 vdb-entry signature
- 34140 third-party-advisory
- 34272 third-party-advisory
- 1021799 vdb-entry
- 34145 third-party-advisory
- http://support.avaya.com/elmodocs2/security/ASA-2009-069.htm
- mozilla-invisible-url-spoofing(49087) vdb-entry
- MDVSA-2009:075 vendor-advisory
- 33990 vdb-entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=452979
- http://support.avaya.com/japple/css/japple?temp.documentID=366362&temp.productID=154235&temp.releaseID=361845&temp.bucketID=126655&PAGE=Document
- oval:org.mitre.oval:def:7435 vdb-entry signature