Description
Mozilla Firefox before 3.6.18, Thunderbird before 3.1.11, and SeaMonkey through 2.0.14 do not distinguish between cookies for two domain names that differ only in a trailing dot, which allows remote web servers to bypass the Same Origin Policy via Set-Cookie headers.
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 | 2.0.11-6 | DSA-2269-1 |
| Debian 6.0 | icedove | 3.0.11-1+squeeze3 | DSA-2273-3 |
| Debian 6.0 | iceweasel | 3.5.16-8 | DSA-2268-1 |
| Debian 5.0 | xulrunner | 1.9.0.19-12 | DSA-2268-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | firefox | 3.6.18-1.el6_1 | RHSA-2011:0885 |
| RHEL 6 | thunderbird | 3.1.11-2.el6_1 | RHSA-2011:0886 |
| RHEL 6 | xulrunner +1 | 1.9.2.18-2.el6_1 | RHSA-2011:0885 |
| RHEL 5 | firefox | 3.6.18-1.el5_6 | RHSA-2011:0885 |
| RHEL 5 | thunderbird | 2.0.0.24-18.el5_6 | RHSA-2011:0887 |
| RHEL 5 | xulrunner +1 | 1.9.2.18-2.el5_6 | RHSA-2011:0885 |
| RHEL 4 | firefox | 3.6.18-2.el4 | RHSA-2011:0885 |
| RHEL 4 | seamonkey +5 | 1.0.9-71.el4 | RHSA-2011:0888 |
| RHEL 4 | thunderbird | 1.5.0.12-39.el4 | RHSA-2011:0887 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Productivity 5 | thunderbird | 2.0.0.24-18.el5_6 | RHSA-2011:0887 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 45.5.1-1.1 | openSUSE-SU-2024:10230-1 |
Advisories 8
- RHSA-2011:0888 Red Hat Security Advisory: seamonkey security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2011:0886 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2011:0887 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2011:0885 Red Hat Security Advisory: firefox security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-2269-1 iceape - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2268-1 iceweasel - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2273-3 icedove - multiple issues Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10230-1 MozillaThunderbird-45.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- MDVSA-2011:111 vendor-advisory
- 45002 third-party-advisory
- http://support.avaya.com/css/P8/documents/100145333
- USN-1149-1 vendor-advisory
- http://www.mozilla.org/security/announce/2011/mfsa2011-24.html
- http://support.avaya.com/css/P8/documents/100144854
- RHSA-2011:0887 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=616264
- RHSA-2011:0885 vendor-advisory
- DSA-2268 vendor-advisory
- RHSA-2011:0888 vendor-advisory
- oval:org.mitre.oval:def:13693 vdb-entry signature
- DSA-2269 vendor-advisory
- SUSE-SA:2011:028 vendor-advisory
- RHSA-2011:0886 vendor-advisory
- DSA-2273 vendor-advisory