What’s Vulnerable › Vulnerabilities

CVE-2012-3976

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2012-08-29 · updated 2026-06-16
• Weakness: CWE-200

Description

Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, and SeaMonkey before 2.12 do not properly handle onLocationChange events during navigation between different https sites, which allows remote attackers to spoof the X.509 certificate information in the address bar via a crafted web page.

Affected products

• Canonical Ubuntu Linux: 10.04, 11.04, 11.10, 12.04
• Mozilla Firefox: before 15.0; from 10.0 before 10.0.7 — fixed in 10.0.7, 15.0
• Mozilla Seamonkey: before 2.12 — fixed in 2.12
• Opensuse: 12.2
• RedHat Enterprise Linux Desktop: 5.0, 6.0
• RedHat Enterprise Linux Eus: 6.3
• RedHat Enterprise Linux Server: 5.0, 6.0
• RedHat Enterprise Linux Server Eus: 6.3
• RedHat Enterprise Linux Workstation: 5.0, 6.0
• SUSE Linux Enterprise Server 15 SP1: 10-sp4, 11-sp2
• SUSE Linux Enterprise Server: 10-sp4, 11-sp2
• SUSE Linux Enterprise Software Development Kit: 11-sp2

How to fix

Upgrade to a fixed version: Mozilla Firefox 10.0.7, 15.0; Mozilla Seamonkey 2.12. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00028.html
• http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00011.html
• http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00014.html
• http://rhn.redhat.com/errata/RHSA-2012-1210.html
• http://www.mozilla.org/security/announce/2012/mfsa2012-69.html
• http://www.securityfocus.com/bid/55313
• http://www.ubuntu.com/usn/USN-1548-1
• http://www.ubuntu.com/usn/USN-1548-2
• http://www.xerox.com/download/security/security-bulletin/16287-4d6b7b0c81f7b/cert_XRX13-003_v1.0.pdf
• https://bugzilla.mozilla.org/show_bug.cgi?id=768568
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16060
• http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00028.html

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