CVE-2012-0479 in Firefox
Summary
by MITRE
Mozilla Firefox 4.x through 11.0, Firefox ESR 10.x before 10.0.4, Thunderbird 5.0 through 11.0, Thunderbird ESR 10.x before 10.0.4, and SeaMonkey before 2.9 allow remote attackers to spoof the address bar via an https URL for invalid (1) RSS or (2) Atom XML content.
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Analysis
by VulDB Data Team • 10/21/2024
This vulnerability resides in the web browser and email client software ecosystems, specifically affecting Mozilla Firefox versions 4.0 through 11.0, Firefox ESR 10.x before 10.0.4, Thunderbird versions 5.0 through 11.0, Thunderbird ESR 10.x before 10.0.4, and SeaMonkey before 2.9. The flaw enables remote attackers to manipulate the address bar display when processing invalid RSS or Atom XML content, creating a deceptive user interface that can mislead users about the actual source of content. This represents a significant security concern as it undermines the fundamental trust users place in visual indicators of web security. The vulnerability stems from improper handling of malformed XML content within the browser's rendering engine, where the system fails to properly validate the security context of content that appears to be HTTPS-based but is actually generated from untrusted sources.
The technical implementation of this vulnerability involves the browser's handling of XML content within secure contexts, where the system incorrectly processes invalid RSS or Atom feeds and displays misleading address bar information. When users encounter malformed XML content, particularly in feed readers or content parsing components, the browser's security indicators become compromised. The flaw specifically manifests when the system attempts to display an HTTPS URL in the address bar while processing invalid XML content, creating a false sense of security for users. This vulnerability operates at the intersection of web security protocols and content parsing mechanisms, where the boundary between trusted and untrusted content becomes blurred. According to CWE standards, this maps to CWE-693, which covers protection mechanism failures, and more specifically relates to CWE-200, information exposure, as it reveals potentially misleading security information to users. The issue also aligns with ATT&CK technique T1059.007, which involves content injection in web applications, and T1566.001, which covers spearphishing with attachments, as attackers could leverage this to create convincing phishing scenarios.
The operational impact of this vulnerability extends beyond simple user deception to potentially enable more sophisticated attacks including credential theft, malware distribution, and social engineering campaigns. Attackers can craft malicious RSS or Atom feeds that appear to originate from legitimate HTTPS sources, causing users to trust content that may contain embedded malicious links or scripts. The vulnerability affects not only web browsing but also email client functionality since Thunderbird and SeaMonkey are also impacted, expanding the attack surface significantly. Users may unknowingly interact with content that appears secure but is actually generated from untrusted sources, creating opportunities for phishing attacks, drive-by downloads, and other malicious activities. The security implications are particularly severe in enterprise environments where users may encounter such content through corporate email systems or web feeds, potentially leading to data breaches or system compromise. Organizations must consider the broader implications of this vulnerability when implementing security policies and user training programs, as the deception mechanism can bypass traditional security controls that rely on visual indicators of web security.
Mitigation strategies for this vulnerability require immediate software updates and patches to affected versions, as well as enhanced content validation mechanisms. System administrators should prioritize updating all affected browser and email client installations to the latest versions that contain the necessary security fixes. Organizations should implement network-level monitoring to detect and block suspicious XML content, particularly feeds that might be used to exploit this vulnerability. Browser security configurations should be reviewed to ensure that content validation is properly enforced, and users should be educated about the potential risks of interacting with content from untrusted sources. The vulnerability highlights the importance of proper input validation and security context management in web applications, and organizations should consider implementing additional layers of security such as content security policies and sandboxing mechanisms to prevent exploitation. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other components of the web ecosystem. Additionally, the incident underscores the need for robust security testing of content parsing and rendering components, as well as the importance of maintaining up-to-date security patches across all software systems.