CVE-2005-0231 in Thunderbird
Summary
by MITRE
Firefox 1.0 does not invoke the Javascript Security Manager when a user drags a javascript: or data: URL to a tab, which allows remote attackers to bypass the security model, aka "firetabbing."
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Analysis
by VulDB Data Team • 07/01/2019
The vulnerability described in CVE-2005-0231 represents a critical flaw in the Firefox 1.0 web browser's security architecture that fundamentally undermines its JavaScript execution model. This issue specifically affects the browser's handling of drag-and-drop operations involving malicious URLs, creating a pathway for remote attackers to circumvent the established security boundaries that normally protect users from potentially harmful script execution. The vulnerability stems from Firefox's failure to properly enforce its JavaScript Security Manager during specific user interaction scenarios, particularly when users engage in drag-and-drop activities with URLs that contain JavaScript code or data URIs.
The technical implementation of this vulnerability exploits the browser's inconsistent security enforcement mechanisms. When a user drags a javascript: or data: URL into a Firefox tab, the browser should normally invoke its JavaScript Security Manager to validate and restrict the execution context of such potentially dangerous content. However, in the affected Firefox 1.0 version, this security check is bypassed entirely, allowing malicious scripts embedded within these URLs to execute with elevated privileges that they would normally be denied. This creates a scenario where remote attackers can craft malicious URLs containing JavaScript code that, when dragged into a target browser tab, executes with the same permissions as if the user had manually entered the code into a trusted context.
The operational impact of this vulnerability is significant and directly aligns with the ATT&CK framework's technique T1059.007 for JavaScript execution. Attackers can leverage this flaw to deliver malicious payloads through social engineering campaigns where victims are tricked into dragging seemingly benign URLs into their browser tabs. The vulnerability effectively allows for a form of "firetabbing" attack where malicious code can execute in the context of the victim's browser session, potentially leading to session hijacking, credential theft, or other malicious activities that would normally be prevented by Firefox's security model. This bypass of the security manager creates a persistent threat vector that can be exploited across different web applications and contexts where Firefox is used.
The root cause of this vulnerability can be traced to the improper implementation of security boundaries within Firefox's drag-and-drop handling code. According to CWE-284, this represents an inadequate access control mechanism where the browser fails to properly validate the source and destination of dragged content. The vulnerability demonstrates a classic flaw in security architecture where the application's trust model is violated through inconsistent enforcement of security policies. Organizations using Firefox 1.0 were particularly vulnerable as this flaw existed in a widely deployed browser version, making it an attractive target for attackers seeking to exploit the security gap for mass distribution of malicious payloads. The lack of proper validation during the drag-and-drop operation creates a persistent attack surface that remains active as long as the vulnerable browser version is in use.
The recommended mitigation for this vulnerability involves immediate upgrade to a patched version of Firefox where the JavaScript Security Manager is properly invoked during all drag-and-drop operations involving URL content. System administrators should also implement browser security policies that restrict the execution of JavaScript content from untrusted sources and educate users about the dangers of dragging and dropping unknown URLs into browser tabs. Additional protective measures include implementing content filtering solutions and monitoring for suspicious drag-and-drop activities that might indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security software and the potential consequences of failing to address security gaps in widely used applications.