CVE-2005-0230 in Netscape
Summary
by MITRE
Firefox 1.0 does not prevent the user from dragging an executable file to the desktop when it has an image/gif content type but has a dangerous extension such as .bat or .exe, which allows remote attackers to bypass the intended restriction and execute arbitrary commands via malformed GIF files that can still be parsed by the Windows batch file parser, aka "firedragging."
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Analysis
by VulDB Data Team • 03/10/2021
The vulnerability described in CVE-2005-0230 represents a significant security flaw in the Firefox web browser version 1.0 that exploited user interaction patterns and content type misinterpretation to enable arbitrary code execution. This issue specifically targeted the browser's handling of file downloads and drag-and-drop operations, creating a dangerous intersection between web content interpretation and local system security controls. The vulnerability exploited the fact that Firefox's security model did not adequately validate file extensions against content type headers during drag-and-drop operations, allowing malicious actors to craft web content that appeared benign while containing executable payloads.
The technical flaw centered on Firefox's failure to properly enforce content type restrictions during user interactions with downloadable files. When a user dragged a file from a web page to their desktop, the browser would typically check the file's content type and extension to determine appropriate handling behavior. However, this vulnerability allowed attackers to serve files with image/gif content types but with executable extensions such as .bat or .exe. The browser's security model failed to recognize that a file with a .bat or .exe extension, regardless of its content type header, should be treated as a potentially dangerous executable rather than a safe image file. This misinterpretation occurred because the drag-and-drop functionality did not perform the same security validations that were applied during normal file downloads.
The operational impact of this vulnerability was particularly severe as it enabled remote attackers to bypass intended security restrictions through a seemingly innocuous web interaction. The attack vector leveraged the "firedragging" technique where malicious web content would present an image file with a dangerous extension, tricking users into dragging it to their desktop. Once on the desktop, Windows would interpret the file as an executable due to its extension, regardless of the actual content type. This created a scenario where users could unknowingly create executable files that would run with their system privileges, potentially leading to complete system compromise. The vulnerability was especially dangerous because it relied on user interaction with web content rather than requiring exploitation of other browser vulnerabilities.
The security implications of this vulnerability extend beyond simple file execution, as it demonstrated fundamental flaws in how browsers handle content type validation during user interactions. This issue highlighted the importance of consistent security policies across all browser functions, particularly those involving user-controlled file operations. The vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic case of insufficient security checks during file handling operations. From an ATT&CK framework perspective, this vulnerability maps to techniques involving social engineering through file manipulation and execution of malicious code through user interaction. The flaw also demonstrates the importance of defense in depth, as the vulnerability could have been prevented through multiple layers of security validation including proper content type checking, extension validation, and user awareness mechanisms.
Mitigation strategies for this vulnerability required immediate browser updates and implementation of stricter file handling policies. Users needed to be educated about the dangers of dragging files from untrusted sources and the importance of verifying file extensions before executing downloaded content. Browser vendors implemented more robust content type validation during drag-and-drop operations and enhanced file extension checking mechanisms. The fix involved modifying Firefox's file handling routines to ensure that file extensions were properly validated regardless of content type headers, particularly for operations involving user-controlled file movements. This vulnerability underscored the critical need for comprehensive security testing of user interaction patterns and highlighted how seemingly benign features could be exploited for significant security breaches when proper validation controls were absent.