Description
The CSS parser in Mozilla Firefox 3.x before 3.0.5 and 2.x before 2.0.0.19, Thunderbird 2.x before 2.0.0.19, and SeaMonkey 1.x before 1.1.14 ignores the '\0' escaped null character, which might allow remote attackers to bypass protection mechanisms such as sanitization routines.
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 4.0 | iceweasel | 2.0.0.19-0etch1 | DSA-1707-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | firefox | 3.0.5-1.el5_2 | RHSA-2008:1036 |
| RHEL 5 | nspr +1 | 4.7.3-2.el5 | RHSA-2008:1036 |
| RHEL 5 | nss +3 | 3.12.2.0-2.el5 | RHSA-2008:1036 |
| RHEL 5 | xulrunner +2 | 1.9.0.5-1.el5_2 | RHSA-2008:1036 |
| RHEL 4 | firefox | 3.0.5-1.el4 | RHSA-2008:1036 |
| RHEL 4 | nspr +1 | 4.7.3-1.el4 | RHSA-2008:1036 |
| RHEL 4 | nss +1 | 3.12.2.0-1.el4 | RHSA-2008:1036 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
Advisories 3
- RHSA-2008:1036 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1707-1 iceweasel - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- 32882 vdb-entry
- 1021425 vdb-entry
- 33408 third-party-advisory
- oval:org.mitre.oval:def:9662 vdb-entry signature
- 33205 third-party-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=228856
- RHSA-2008:1036 vendor-advisory
- ADV-2009-0977 vdb-entry
- USN-690-2 vendor-advisory
- http://www.mozilla.org/security/announce/2008/mfsa2008-67.html
- USN-701-1 vendor-advisory
- 33231 third-party-advisory
- MDVSA-2008:245 vendor-advisory
- USN-690-1 vendor-advisory
- MDVSA-2009:012 vendor-advisory
- 33203 third-party-advisory
- DSA-1707 vendor-advisory
- 33216 third-party-advisory
- 256408 vendor-advisory
- 33204 third-party-advisory
- 33184 third-party-advisory
- 258748 vendor-advisory
- MDVSA-2008:244 vendor-advisory
- 33188 third-party-advisory
- 33523 third-party-advisory
- 35080 third-party-advisory
- mozilla-cssparser-security-bypass(47415) vdb-entry
- 34501 third-party-advisory