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4.0

Firefox, Thunderbird, SeaMonkey can be tricked into adding security exceptions

CVE-2012-1964 · published 14 years ago
Summary

The warning page that appears for certificate problems in Firefox (versions 4‑12), Thunderbird (versions 5‑12) and SeaMonkey (before 2.10) can be hidden inside another page. An attacker who can intercept the connection could use this to make the user unknowingly accept a risky certificate. Upgrade to the latest versions of these browsers or apply the security updates that fix the click‑jacking handling.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
mozilla firefox 4.0
4.0.1
5.0
5.0.1
6.0
6.0.1
6.0.2
7.0
7.0.1
8.0
8.0.1
9.0
10 more version ranges
cpe:2.3:a:mozilla:firefox:4.0:*:*:*:*:*:*:*
mozilla thunderbird 5.0
6.0
6.0.1
6.0.2
7.0
7.0.1
8.0
9.0
9.0.1
10.0
10.0.1
10.0.2
5 more version ranges
cpe:2.3:a:mozilla:thunderbird:5.0:*:*:*:*:*:*:*
mozilla thunderbird_esr 10.0
10.0.1
10.0.2
10.0.3
10.0.4
10.0.5
cpe:2.3:a:mozilla:thunderbird_esr:10.0:*:*:*:*:*:*:*
mozilla seamonkey <= 2.0.14
1.0
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.0.8
1.0.9
1.1
37 more version ranges
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
Original advisory text
The certificate-warning functionality in browser/components/certerror/content/aboutCertError.xhtml in Mozilla Firefox 4.x through 12.0, Firefox ESR 10.x before 10.0.6, Thunderbird 5.0 through 12.0,...
The certificate-warning functionality in browser/components/certerror/content/aboutCertError.xhtml in Mozilla Firefox 4.x through 12.0, Firefox ESR 10.x before 10.0.6, Thunderbird 5.0 through 12.0, Thunderbird ESR 10.x before 10.0.6, and SeaMonkey before 2.10 does not properly handle attempted clickjacking of the about:certerror page, which allows man-in-the-middle attackers to trick users into adding an unintended exception via an IFRAME element.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
4.0 Medium
Exploitation
<1% chance of attack within 30 days
Timeline
Published18 Jul 2012
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-2012-1964 · NVD
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