Description
The International Domain Name (IDN) support in Firefox 1.0, Camino .8.5, and Mozilla before 1.7.6 allows remote attackers to spoof domain names using punycode encoded domain names that are decoded in URLs and SSL certificates in a way that uses homograph characters from other character sets, which facilitates 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 4 | firefox | 1.0.1-1.4.3 | RHSA-2005:176 |
Advisories 1
- RHSA-2005:176 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- http://www.shmoo.com/idn/homograph.txt
- multiple-browsers-idn-spoof(19236) vdb-entry
- 20050206 state of homograph attacks mailing-list
- http://www.shmoo.com/idn
- SUSE-SA:2005:016 vendor-advisory
- oval:org.mitre.oval:def:11229 vdb-entry signature
- oval:org.mitre.oval:def:100029 vdb-entry signature
- RHSA-2005:176 vendor-advisory
- RHSA-2005:384 vendor-advisory
- GLSA-200503-30 vendor-advisory
- GLSA-200503-10 vendor-advisory
- 20050208 International Domain Name [IDN] support in modern browsers allows attackers to spoof domain name URLs + SSL certs. mailing-list
- 12461 vdb-entry
- http://www.mozilla.org/security/announce/mfsa2005-29.html