CVE-2005-1531 in Mozilla
Summary
by MITRE
Firefox before 1.0.4 and Mozilla Suite before 1.7.8 does not properly implement certain security checks for script injection, which allows remote attackers to execute script via "Wrapped" javascript: URLs, as demonstrated using (1) a javascript: URL in a view-source: URL, (2) a javascript: URL in a jar: URL, or (3) "a nested variant."
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Analysis
by VulDB Data Team • 12/17/2024
This vulnerability represents a critical cross-site scripting flaw in mozilla firefox and suite applications that stems from inadequate validation of javascript: URLs within specific contextual environments. The issue manifests when the browser fails to properly sanitize or verify the security context of javascript: URLs that are embedded within view-source: and jar: URL schemes, allowing malicious actors to bypass security restrictions and execute arbitrary code. The vulnerability specifically affects versions prior to firefox 1.0.4 and mozilla suite 1.7.8, indicating a long-standing flaw in the browser's security architecture that was not adequately addressed until these patch releases. The flaw enables attackers to construct malicious URLs that appear legitimate but contain embedded javascript code that executes when the browser processes these specially crafted references.
The technical implementation of this vulnerability exploits the browser's handling of URL schemes and their associated security contexts. When a user visits a page containing a javascript: URL within a view-source: or jar: context, the browser's security model fails to properly validate that the script execution should be permitted. This occurs because the browser does not adequately distinguish between trusted and untrusted script sources when processing these nested URL structures. The vulnerability is particularly dangerous because it allows for script injection attacks that can be concealed within legitimate-looking URLs, making them difficult to detect and prevent through standard security measures. The attack vectors demonstrate the complexity of the flaw, as it operates through multiple variants including direct javascript: URLs in view-source: contexts, javascript: URLs within jar: contexts, and nested variations that compound the security bypass.
The operational impact of this vulnerability extends beyond simple script execution to encompass potential data theft, session hijacking, and complete system compromise. Attackers can leverage this flaw to inject malicious javascript that can access user credentials, steal session cookies, redirect users to malicious sites, or perform other harmful actions. The vulnerability is particularly concerning because it operates at the browser level and can affect any user who visits a compromised website or clicks on malicious links. The security implications include potential breaches of user privacy, unauthorized access to sensitive information, and the ability for attackers to establish persistent footholds within user environments. The attack methods described in the vulnerability demonstrate sophisticated exploitation techniques that can bypass traditional security controls and user awareness measures.
Mitigation strategies for this vulnerability require immediate patching of affected browser versions and implementation of additional security measures. Organizations should ensure that all firefox and mozilla suite installations are updated to versions 1.0.4 or later for firefox and 1.7.8 or later for the mozilla suite. Network administrators should consider implementing web application firewalls and content filtering solutions to detect and block malicious javascript: URLs. Users should be educated about the dangers of clicking on suspicious links and should be encouraged to maintain updated browser software. The vulnerability aligns with CWE-79 Cross-site Scripting and follows attack patterns described in the attack tree model of the attack framework, specifically demonstrating how URL scheme handling can be exploited to bypass security controls. Additional defensive measures include implementing strict content security policies and monitoring for unusual javascript execution patterns within browser environments.