CVE-2006-1735 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 an eval in an XBL method binding (XBL.method.eval) to create Javascript functions that are compiled with extra privileges.
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Analysis
by VulDB Data Team • 01/20/2025
This vulnerability exists in multiple Mozilla products including Firefox, Thunderbird, Mozilla Suite, and SeaMonkey versions prior to specific patches. The flaw resides in the handling of XBL (XML Binding Language) method bindings where the eval function can be exploited to create javascript functions with elevated privileges. This represents a critical privilege escalation issue that allows remote attackers to execute arbitrary code on affected systems. The vulnerability stems from insufficient sandboxing mechanisms within the XBL processing engine, which permits malicious code to bypass normal javascript security restrictions. Attackers can craft specially crafted web content that when processed by these vulnerable applications triggers the exploitation path through XBL.method.eval functionality.
The technical implementation of this vulnerability leverages the inherent capabilities of XBL method bindings to execute javascript code with extended privileges. When an application processes XBL content containing malicious eval statements, the javascript engine compiles these functions with elevated permissions that normally would be restricted. This creates a pathway for attackers to execute arbitrary code with the privileges of the running application, potentially leading to full system compromise. The vulnerability specifically affects versions where the XBL processing mechanism lacks proper privilege separation between user content and application code execution contexts. This weakness aligns with CWE-254, which addresses security issues related to inadequate privilege separation in software systems.
The operational impact of this vulnerability is severe as it enables remote code execution without requiring user interaction beyond visiting a malicious webpage or opening a specially crafted email message. An attacker could exploit this through web-based attacks targeting Firefox or Thunderbird users, or through email-based attacks targeting Thunderbird users. The vulnerability affects a wide range of Mozilla products across multiple versions, making it particularly dangerous as it could impact large user bases simultaneously. Successful exploitation could lead to complete system compromise, data theft, or deployment of additional malware. The attack surface includes web browsing activities, email processing, and any application functionality that processes XBL content.
Mitigation strategies for this vulnerability involve applying the official security patches released by Mozilla for each affected product line. Organizations should prioritize updating all instances of Firefox 1.x before 1.5, Thunderbird 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0 to their latest secure versions. System administrators should implement network-based controls to block access to known malicious domains and content that might exploit this vulnerability. Additionally, users should be educated about the risks of visiting untrusted websites and opening suspicious email attachments. The vulnerability demonstrates the importance of maintaining up-to-date security patches and proper input validation in web applications. Security monitoring should include detection of suspicious XBL content processing and anomalous javascript execution patterns. This vulnerability also highlights the need for comprehensive privilege management in web browser architectures and aligns with ATT&CK technique T1059 for execution through scripting languages.