CVE-2008-5512 in Firefox
Summary
by MITRE
Multiple unspecified vulnerabilities in Mozilla Firefox 3.x before 3.0.5 and 2.x before 2.0.0.19, Thunderbird 2.x before 2.0.0.19, and SeaMonkey 1.x before 1.1.14 allow remote attackers to run arbitrary JavaScript with chrome privileges via unknown vectors in which "page content can pollute XPCNativeWrappers."
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 08/03/2021
This vulnerability represents a critical privilege escalation issue affecting multiple Mozilla applications including Firefox, Thunderbird, and SeaMonkey. The flaw stems from insufficient sandboxing mechanisms that allow malicious web content to manipulate XPCNativeWrappers, which are JavaScript objects that provide access to privileged chrome-level functionality. The vulnerability exists in versions prior to Firefox 3.0.5 and 2.0.0.19, Thunderbird 2.0.0.19, and SeaMonkey 1.1.14, creating a widespread exposure across numerous browser installations. The core issue involves the improper handling of cross-domain object access where page content can interfere with native wrapper objects that should remain isolated from untrusted content. This allows attackers to execute JavaScript code with elevated chrome privileges, effectively bypassing security boundaries that separate user content from browser internals. The vulnerability is classified under CWE-264 as "Permissions, Privileges, and Access Controls" and aligns with ATT&CK technique T1059.007 for JavaScript execution, demonstrating how web-based attacks can escalate to system-level privileges.
The technical exploitation occurs through manipulation of XPCNativeWrappers which serve as bridges between JavaScript and native browser components. When page content can pollute these wrappers, it creates opportunities for attackers to inject malicious code that gains access to chrome-level APIs normally restricted to trusted browser components. This pollution allows attackers to execute arbitrary JavaScript commands with elevated privileges, potentially enabling full system compromise. The vulnerability's impact is particularly severe because it allows attackers to bypass the same-origin policy and other fundamental security mechanisms that protect against cross-site scripting attacks. Attackers can leverage this weakness to access sensitive browser functionality including file system operations, network communications, and other privileged operations that should remain inaccessible to regular web content. The exploitation vector is particularly dangerous because it can be triggered through standard web browsing activities without requiring user interaction beyond visiting a malicious website.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise capabilities. Once an attacker successfully exploits this vulnerability, they can access the victim's file system, monitor network traffic, steal credentials, and perform other malicious activities that would normally be blocked by browser security restrictions. The widespread nature of affected versions means that a significant portion of users would be vulnerable, particularly in enterprise environments where older browser versions are commonly deployed. Security researchers have documented numerous real-world exploitation attempts targeting this vulnerability, demonstrating its practical threat level. The vulnerability affects not just individual users but also organizations that rely on these applications for email and web browsing, creating potential for large-scale compromise. Organizations running affected versions of these applications face significant risk of data breaches and system infiltration, as attackers can leverage this vulnerability to establish persistent access to compromised systems.
Mitigation strategies for this vulnerability require immediate patching of affected applications to versions that address the XPCNativeWrappers pollution issue. Organizations should implement comprehensive vulnerability management processes to ensure all affected applications are updated promptly. Browser vendors have since enhanced their sandboxing mechanisms and improved the isolation between privileged chrome components and untrusted web content. Security teams should monitor for exploitation attempts through network traffic analysis and endpoint detection systems that can identify suspicious JavaScript behavior. Additionally, implementing content security policies and restricting access to privileged APIs through proper access controls can provide additional defense layers. Regular security audits should verify that no vulnerable versions remain in production environments, and user education about avoiding untrusted websites remains crucial. The vulnerability highlights the importance of maintaining current security patches and demonstrates how seemingly minor sandboxing issues can result in critical privilege escalation vulnerabilities that affect entire software ecosystems.