CVE-2006-6504 in Firefox
Summary
by MITRE
Mozilla Firefox 2.x before 2.0.0.1, 1.5.x before 1.5.0.9, and SeaMonkey before 1.0.7 allows remote attackers to execute arbitrary code by appending an SVG comment DOM node to another type of document, which triggers memory corruption.
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Analysis
by VulDB Data Team • 01/18/2025
This vulnerability represents a critical memory corruption flaw in Mozilla Firefox and SeaMonkey browsers that existed across multiple version ranges. The issue stems from improper handling of document node types during SVG comment processing, specifically when an SVG comment DOM node is appended to different document types. The vulnerability affects Firefox versions 2.x before 2.0.0.1 and 1.5.x before 1.5.0.9, as well as SeaMonkey versions before 1.0.7, making it a widespread concern across the Mozilla ecosystem during that time period. The flaw demonstrates a classic buffer overflow or memory corruption pattern that can be exploited to execute arbitrary code remotely.
The technical implementation of this vulnerability involves the browser's DOM (Document Object Model) processing engine failing to properly validate or sanitize node type interactions. When an SVG comment DOM node is appended to another document type, the memory management system encounters an inconsistent state that leads to memory corruption. This type of vulnerability maps directly to CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflows with insufficient bounds checks. The flaw occurs in the browser's rendering engine where different node types interact without proper type checking mechanisms, creating a pathway for attackers to manipulate memory layout and execute malicious code.
The operational impact of this vulnerability is severe as it allows remote code execution without user interaction, making it particularly dangerous for web-based attacks. Attackers can craft malicious web pages that, when loaded in affected browsers, trigger the memory corruption condition and provide a remote execution vector. This vulnerability directly aligns with ATT&CK technique T1059.007, which covers command and scripting interpreter execution through web browsers, and T1190, which involves exploitation of remote services via web applications. The attack surface extends to any web content that might trigger the specific DOM node interaction pattern, making it highly exploitable in real-world scenarios where users browse the internet.
Mitigation strategies for this vulnerability require immediate patching of affected browser versions, as no effective workarounds exist for this type of memory corruption. Organizations should prioritize updating to Firefox 2.0.0.1 or later, 1.5.0.9 or later, or SeaMonkey 1.0.7 or later to address the issue. Network administrators should implement web content filtering to block potentially malicious SVG content and monitor for exploitation attempts. Security teams should also consider deploying intrusion detection systems that can identify patterns associated with this specific vulnerability, including attempts to manipulate DOM nodes in the described manner. The vulnerability demonstrates the importance of proper memory management in browser engines and highlights the critical need for comprehensive input validation in DOM processing systems.