CVE-2006-1734 in Thunderbird
Summary
by MITRE
Mozilla Firefox and Thunderbird 1.x before 1.5 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0 allows remote attackers to execute arbitrary code by using the Object.watch method to access the "clone parent" internal function.
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Analysis
by VulDB Data Team • 01/20/2025
This vulnerability represents a critical heap-based buffer overflow in Mozilla's JavaScript engine that affected multiple browser and email client products including Firefox 1.x before 1.5, Thunderbird 1.0.x before 1.0.8, and the Mozilla Suite before 1.7.13. The flaw specifically resides in the Object.watch method implementation which allows attackers to manipulate internal function pointers through carefully crafted JavaScript code. This vulnerability maps to CWE-121 Heap-based Buffer Overflow, which occurs when a program writes data past the end of a buffer allocated on the heap. The attack vector exploits the JavaScript engine's handling of the watch method, which is designed to monitor property access and modification but becomes exploitable when combined with the clone parent internal function.
The technical exploitation involves constructing malicious JavaScript code that leverages the Object.watch method to trigger a memory corruption condition. When the watch method is called on an object with specific parameters, it can cause the JavaScript engine to improperly handle memory allocation and access patterns, leading to a situation where attacker-controlled data can overwrite critical memory regions. The vulnerability specifically targets the internal clone parent function which is used for object cloning operations within the JavaScript engine's memory management system. This allows remote attackers to execute arbitrary code with the privileges of the user running the vulnerable application, representing a severe privilege escalation risk.
The operational impact of this vulnerability is significant as it enables remote code execution without requiring user interaction beyond visiting a malicious website or opening a specially crafted email message. Attackers can leverage this vulnerability to install malware, steal sensitive data, or take complete control of affected systems. The widespread adoption of these Mozilla products across desktop environments made this vulnerability particularly dangerous, as it affected a large user base including enterprise and individual users. The vulnerability demonstrates a fundamental flaw in the JavaScript engine's memory management and object handling mechanisms, highlighting the complexity of secure implementation in modern web browsers that must balance performance with security.
Security mitigations for this vulnerability include immediate patching of affected software versions to the recommended updates which contain fixes for the JavaScript engine's memory handling. Organizations should implement network-based protections such as web application firewalls and content filtering to block malicious JavaScript content. Browser hardening techniques including disabling unnecessary JavaScript features and implementing strict content security policies can reduce the attack surface. The vulnerability also underscores the importance of regular security updates and the need for comprehensive testing of JavaScript engine implementations. From an ATT&CK perspective, this vulnerability maps to T1059.007 Command and Scripting Interpreter: JavaScript, and T1566.001 Phishing: Spearphishing Attachment, as it enables attackers to execute malicious code through web-based delivery methods. Additionally, it relates to T1070.006 Indicator Removal on Host: File Deletion, as attackers may attempt to remove evidence of compromise through the execution of malicious code. Organizations should also consider implementing sandboxing mechanisms and privilege separation to limit the potential impact of successful exploitation, as the vulnerability can lead to complete system compromise when executed successfully.