CVE-2008-4068 in Firefox
Summary
by MITRE
Directory traversal vulnerability in Mozilla Firefox before 2.0.0.17 and 3.x before 3.0.2, Thunderbird before 2.0.0.17, and SeaMonkey before 1.1.12 allows remote attackers to bypass "restrictions imposed on local HTML files," and obtain sensitive information and prompt users to write this information into a file, via directory traversal sequences in a resource: URI.
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Analysis
by VulDB Data Team • 08/17/2019
The vulnerability described in CVE-2008-4068 represents a critical directory traversal flaw affecting multiple Mozilla products including Firefox, Thunderbird, and SeaMonkey. This security weakness stems from inadequate validation of resource URI paths, specifically when processing resource: URIs that contain directory traversal sequences such as ../ or ..\.. This vulnerability allows remote attackers to bypass local file access restrictions that are typically enforced by web browsers for security purposes.
The technical implementation of this flaw occurs within the browser's handling of resource: URIs which are designed to reference local files through a specific protocol. When these URIs contain directory traversal sequences, the browser fails to properly sanitize or validate the path components, enabling attackers to navigate outside of the intended directory boundaries. This improper input validation creates a path traversal condition that can be exploited to access files that should normally be restricted, including system files, user data, and potentially sensitive configuration information.
The operational impact of this vulnerability extends beyond simple information disclosure to include potential file system manipulation capabilities. Attackers can not only read sensitive files that are normally protected by local access restrictions but can also prompt users to write information into files on the local system. This dual capability creates a significant risk as it allows for both data exfiltration and potential file system corruption or malicious file creation. The vulnerability specifically affects versions prior to Firefox 2.0.0.17 and 3.x 3.0.2, Thunderbird 2.0.0.17, and SeaMonkey 1.1.12, indicating this was a widespread issue across the Mozilla ecosystem.
This vulnerability aligns with CWE-22, which specifically addresses path traversal or directory traversal flaws in software systems. The flaw demonstrates poor input validation practices where user-supplied URI components are not properly sanitized before being processed. From an attacker's perspective, this vulnerability maps to several ATT&CK techniques including T1059 for executing commands through browser interfaces and T1074 for data staging and exfiltration. The ability to bypass local file restrictions also relates to T1566 for credential access and T1083 for file and directory discovery.
Mitigation strategies for this vulnerability require immediate patching of affected software versions to the corrected releases. Organizations should implement comprehensive software update policies to ensure all Mozilla-based applications are running patched versions. Additionally, network administrators should consider implementing web application firewalls and content filtering solutions to monitor and block suspicious resource: URI patterns. The vulnerability underscores the importance of proper input validation and access control mechanisms, particularly when handling local file system operations through web interfaces. Regular security assessments and penetration testing should be conducted to identify similar path traversal vulnerabilities in other applications and systems within the organization's infrastructure.