The Internationalized Domain Names (IDN) blacklist in Mozilla Firefox 3.0.6 and other versions before 3.0.9; Thunderbird before 2.0.0.21; and SeaMonkey before 1.1.15 does not include box-drawing characters, which allows remote attackers to spoof URLs and conduct phishing attacks, as demonstrated by homoglyphs of the / (slash) and ? (question mark) characters in a subdomain of a .cn domain name, a different vulnerability than CVE-2005-0233. NOTE: some third parties claim that 3.0.6 is not affected, but much older versions perhaps are affected.
http://lists.opensuse.org/opensuse-security-announce/2009-05/msg00000.html
http://rhn.redhat.com/errata/RHSA-2009-0437.html
http://secunia.com/advisories/34096
http://secunia.com/advisories/34843
http://secunia.com/advisories/34844
http://secunia.com/advisories/34894
http://secunia.com/advisories/35042
http://secunia.com/advisories/35065
https://exchange.xforce.ibmcloud.com/vulnerabilities/48974
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11396
https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00683.html
http://www.debian.org/security/2009/dsa-1797
http://www.debian.org/security/2009/dsa-1830
http://www.mandriva.com/security/advisories?name=MDVSA-2009:111
http://www.mozilla.org/security/announce/2009/mfsa2009-15.html