CVE-2008-2993 in FOG Forum
Summary
by MITRE
Multiple directory traversal vulnerabilities in index.php in FOG Forum 0.8.1 allow remote attackers to include and execute arbitrary local files via a .. (dot dot) in the (1) fog_lang and (2) fog_skin parameters, probably related to libs/required/share.inc; and possibly the (3) fog_pseudo, (4) fog_posted, (5) fog_password, and (6) fog_cook parameters.
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Analysis
by VulDB Data Team • 10/28/2024
The CVE-2008-2993 vulnerability represents a critical directory traversal flaw in the FOG Forum 0.8.1 web application that exposes multiple attack vectors through improper input validation. This vulnerability stems from insufficient sanitization of user-supplied parameters in the index.php script, specifically affecting the fog_lang, fog_skin, fog_pseudo, fog_posted, fog_password, and fog_cook parameters. The flaw allows remote attackers to manipulate file inclusion mechanisms by leveraging directory traversal sequences using the .. (dot dot) notation, which enables unauthorized access to local files on the server filesystem. The vulnerability is particularly concerning as it affects core application components and potentially exposes sensitive system resources through the libs/required/share.inc file reference.
The technical exploitation of this vulnerability occurs when an attacker submits malicious input containing directory traversal sequences through the affected parameters. When the application processes these parameters without proper validation, it fails to sanitize the input before using it in file inclusion operations. This creates a path traversal condition where the application attempts to access files outside its intended directory scope, potentially leading to arbitrary code execution or sensitive data disclosure. The vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The attack vector operates through the application's file inclusion mechanisms that do not properly validate or sanitize user input before processing.
The operational impact of CVE-2008-2993 extends beyond simple file access, potentially enabling attackers to execute arbitrary code on the affected server. Successful exploitation could result in complete system compromise, data theft, or unauthorized access to sensitive information stored within the application's directory structure. The vulnerability affects the core functionality of the FOG Forum application, potentially allowing attackers to access configuration files, user credentials, or other sensitive data that may be stored in accessible directories. This represents a significant security risk for organizations using the affected software version, as it provides a pathway for attackers to escalate privileges and gain deeper access to the underlying infrastructure. The impact is further amplified by the fact that the vulnerability affects multiple parameters, increasing the attack surface and exploitation opportunities.
Mitigation strategies for CVE-2008-2993 should focus on implementing proper input validation and sanitization mechanisms within the application code. Organizations should immediately upgrade to a patched version of FOG Forum if available, as this vulnerability has been addressed in subsequent releases. The recommended approach includes implementing strict parameter validation that rejects or filters out directory traversal sequences, particularly the .. (dot dot) notation, from all user-supplied inputs. Additionally, the application should employ proper file inclusion practices that validate file paths against a whitelist of allowed directories or use absolute paths to prevent traversal attacks. Security controls should also include restricting file permissions on sensitive system files and implementing proper access controls to limit what files can be accessed through the application interface. This vulnerability demonstrates the importance of following secure coding practices and adhering to the principle of least privilege in web application development, as outlined in various security frameworks including those referenced in the ATT&CK framework for defensive measures against path traversal attacks.