Description
Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority. NOTE: this was originally reported for Firefox before 3.5.
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 14 | nss | 3.12.3-1 | — |
| Debian 13 | nss | 3.12.3-1 | — |
| Debian 12 | nss | 3.12.3-1 | — |
| Debian 5.0 | icedove | 2.0.0.24-0lenny1 | DSA-2025-1 |
| Debian 5.0 | nss | 3.12.3.1-0lenny1 | DSA-1874-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | nspr +1 | 4.7.4-1.el5_3.1 | RHSA-2009:1186 |
| RHEL 5 | nss +3 | 3.12.3.99.3-1.el5_3.2 | RHSA-2009:1186 |
| RHEL 4 | nspr +1 | 4.7.4-1.el4_8.1 | RHSA-2009:1184 |
| RHEL 4 | nss +2 | 3.12.3.99.3-1.el4_8.2 | RHSA-2009:1184 |
| RHEL 3 | seamonkey +9 | 1.0.9-0.45.el3 | RHSA-2009:1432 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5.2 EUS | nspr +1 | 4.7.4-1.el5_2 | RHSA-2009:1207 |
| RHEL 5.2 EUS | nss +3 | 3.12.3.99.3-1.el5_2 | RHSA-2009:1207 |
| RHEL 4.7 EUS | nspr +1 | 4.7.4-1.el4_7.1 | RHSA-2009:1190 |
| RHEL 4.7 EUS | nss +1 | 3.12.3.99.3-1.el4_7.6 | RHSA-2009:1190 |
Advisories 7
- RHSA-2009:1432 Red Hat Security Advisory: seamonkey security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2009:1207 Red Hat Security Advisory: nspr and nss security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2009:1190 Red Hat Security Advisory: nspr and nss security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2009:1186 Red Hat Security Advisory: nspr and nss security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2009:1184 Red Hat Security Advisory: nspr and nss security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- DSA-2025-1 icedove - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1874-1 nss - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- 36139 third-party-advisory
- 36157 third-party-advisory
- 1022632 vdb-entry
- MDVSA-2009:197 vendor-advisory
- SUSE-SA:2009:048 vendor-advisory
- MDVSA-2009:216 vendor-advisory
- SUSE-SR:2009:018 vendor-advisory
- 36434 third-party-advisory
- 36088 third-party-advisory
- http://isc.sans.org/diary.html?storyid=7003
- RHSA-2009:1207 vendor-advisory
- http://www.wired.com/threatlevel/2009/07/kaminsky/
- 36669 third-party-advisory
- 56723 vdb-entry
- RHSA-2009:1432 vendor-advisory
- USN-810-1 vendor-advisory
- oval:org.mitre.oval:def:10751 vdb-entry signature
- USN-810-2 vendor-advisory
- oval:org.mitre.oval:def:8458 vdb-entry signature
- 1021030 vendor-advisory
- http://www.openldap.org/devel/cvsweb.cgi/libraries/libldap/tls_m.c.diff?r1=1.8&r2=1.11&f=h
- ADV-2009-3184 vdb-entry
- 36125 third-party-advisory
- 37098 third-party-advisory
- http://www.mozilla.org/security/announce/2009/mfsa2009-42.html
- https://bugzilla.redhat.com/show_bug.cgi?id=510251
- ADV-2009-2085 vdb-entry
- DSA-1874 vendor-advisory
- MDVSA-2009:217 vendor-advisory
- [oss-security] 20090903 More CVE-2009-2408 like issues mailing-list