CVE-2012-1964 in Firefox
Summary
by MITRE
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.
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Analysis
by VulDB Data Team • 10/22/2024
The vulnerability described in CVE-2012-1964 represents a critical security flaw in the certificate warning handling mechanism of several Mozilla applications including Firefox, Thunderbird, and SeaMonkey. This issue specifically affects versions ranging from 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. The core problem lies in the improper handling of clickjacking attempts against the about:certerror page, which serves as a crucial security warning interface for users encountering certificate-related issues during web browsing.
The technical flaw manifests when an attacker constructs a malicious webpage that embeds the legitimate about:certerror page within an invisible iframe element. This iframe is then positioned over a deceptive interface that mimics the legitimate certificate warning page. When users interact with what they believe to be a legitimate security warning, they are actually clicking on the invisible iframe that contains the malicious certificate exception interface. This vulnerability operates under the well-known CWE-200 information exposure through a clickjacking attack pattern, where the application fails to properly validate user interactions and maintain proper security boundaries.
The operational impact of this vulnerability is severe as it allows man-in-the-middle attackers to bypass critical security measures designed to protect users from certificate mismatches and other cryptographic warnings. An attacker could exploit this vulnerability to trick users into adding certificate exceptions for malicious servers, effectively undermining the entire certificate validation system that browsers rely upon for secure communication. This attack vector is particularly dangerous because it exploits user trust in the browser's security warnings and leverages the legitimate certificate error interface to perform unauthorized actions.
The vulnerability demonstrates a clear failure in the browser's security boundary enforcement mechanisms and represents a classic case of insufficient input validation and improper user interface security controls. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation through user interface deception and credential access through manipulation of security warnings. The attack requires minimal technical sophistication from the adversary, as it relies on social engineering combined with the browser's insufficient protection against clickjacking attempts. Organizations and users should immediately update to patched versions of affected software to prevent exploitation, as the vulnerability essentially allows attackers to bypass fundamental security controls that protect against certificate-based attacks.
This vulnerability highlights the importance of proper clickjacking protection mechanisms in security-critical user interfaces and demonstrates how seemingly minor flaws in security warning handling can result in significant compromise of user security. The affected applications were particularly vulnerable because they failed to implement proper frame-busting or security header controls that would prevent the certificate error pages from being embedded within other documents. The remediation involves implementing proper security measures such as X-Frame-Options headers and ensuring that critical security interfaces cannot be embedded in potentially malicious contexts.