Mozilla Firefox before 3.0.16 and 3.5.x before 3.5.6, and SeaMonkey before 2.0.1, allows remote attackers to spoof an SSL indicator for an http URL or a file URL by setting document.location to an https URL corresponding to a site that responds with a No Content (aka 204) status code and an empty body.
secunia.com/advisories/37699
secunia.com/advisories/37703
secunia.com/advisories/37704
secunia.com/advisories/37785
secunia.com/advisories/37813
secunia.com/advisories/37856
secunia.com/advisories/37881
securitytracker.com/id?1023342
securitytracker.com/id?1023343
www.debian.org/security/2009/dsa-1956
www.mozilla.org/security/announce/2009/mfsa2009-69.html
www.novell.com/linux/security/advisories/2009_63_firefox.html
www.securityfocus.com/bid/37349
www.securityfocus.com/bid/37367
www.ubuntu.com/usn/USN-873-1
www.ubuntu.com/usn/USN-874-1
www.vupen.com/english/advisories/2009/3547
bugzilla.mozilla.org/show_bug.cgi?id=521461
bugzilla.redhat.com/show_bug.cgi?id=546722
exchange.xforce.ibmcloud.com/vulnerabilities/54806
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8379
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9791
rhn.redhat.com/errata/RHSA-2009-1673.html
rhn.redhat.com/errata/RHSA-2009-1674.html
www.redhat.com/archives/fedora-package-announce/2009-December/msg00995.html
www.redhat.com/archives/fedora-package-announce/2009-December/msg01034.html
www.redhat.com/archives/fedora-package-announce/2009-December/msg01041.html