CVE-2008-4718 in X7 Chat
Summary
by MITRE
Directory traversal vulnerability in help/mini.php in X7 Chat 2.0.1 A1 and earlier allows remote attackers to include and execute arbitrary local files via directory traversal sequences in the help_file parameter, a different vector than CVE-2006-2156.
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Analysis
by VulDB Data Team • 11/05/2024
The CVE-2008-4718 vulnerability represents a critical directory traversal flaw discovered in X7 Chat version 2.0.1 A1 and earlier, specifically within the help/mini.php component. This vulnerability enables remote attackers to manipulate the help_file parameter through crafted directory traversal sequences, potentially allowing unauthorized access to local files on the server. The flaw stems from insufficient input validation and sanitization of user-supplied parameters, creating an avenue for attackers to bypass normal file access restrictions and retrieve sensitive information from the server filesystem.
The technical implementation of this vulnerability occurs when the application processes the help_file parameter without proper validation of the input path. Attackers can exploit this by injecting directory traversal sequences such as "../" or "..\" into the parameter, which allows them to navigate beyond the intended directory boundaries and access files that should remain restricted. This particular vulnerability operates through a different attack vector compared to CVE-2006-2156, indicating that the developers may have addressed one traversal issue while leaving another vulnerable pathway open. The flaw aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability is significant, as it could enable attackers to execute arbitrary code on the affected system or extract confidential data from the server. Remote attackers could potentially access sensitive configuration files, database credentials, or other system files that contain critical information. The vulnerability's remote exploitability means that attackers do not require local access or credentials to attempt exploitation, making it particularly dangerous in publicly accessible web applications. This type of vulnerability can lead to complete system compromise, data breaches, and unauthorized access to user information stored within the chat application.
Organizations running affected versions of X7 Chat should immediately implement mitigations including upgrading to patched versions of the software, implementing proper input validation, and restricting file access permissions. The recommended approach involves sanitizing all user inputs through strict validation mechanisms that prevent directory traversal sequences from being processed. Security controls should include implementing proper access controls, using allowlists for acceptable file paths, and ensuring that the application operates with minimal necessary privileges. This vulnerability demonstrates the importance of input validation and proper access control mechanisms, aligning with ATT&CK technique T1059 for command and script injection and T1566 for credential access through exploitation of remote services. Additionally, organizations should consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability pattern.