CVE-2008-5723 in KanniBBS2000i
Summary
by MITRE
Directory traversal vulnerability in CGI RESCUE KanniBBS2000 (aka KanniBBS2000i, MiniBBS2000, and MiniBBS2000i) before 1.03 allows remote attackers to read arbitrary files via unspecified vectors.
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Analysis
by VulDB Data Team • 10/22/2018
The directory traversal vulnerability identified as CVE-2008-5723 affects several variants of the KanniBBS2000 software suite including RESCUE KanniBBS2000, KanniBBS2000i, MiniBBS2000, and MiniBBS2000i versions prior to 1.03. This vulnerability represents a critical security flaw that enables remote attackers to access arbitrary files on the affected systems through unspecified attack vectors. The vulnerability falls under the Common Weakness Enumeration category CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. These attacks exploit insufficient input validation to manipulate file access requests and gain unauthorized access to sensitive system files.
The technical implementation of this vulnerability stems from inadequate sanitization of user-supplied input parameters that are processed by the affected CGI applications. When users interact with the vulnerable software through web interfaces or direct API calls, the system fails to properly validate or sanitize input data that could contain directory traversal sequences such as ../ or ..\ characters. Attackers can exploit this weakness by crafting malicious requests that include these traversal sequences in parameters that control file operations or path resolution within the application's processing logic. The unspecified vectors mentioned in the vulnerability description suggest that the flaw may manifest through multiple entry points within the software's interface or API endpoints, making the attack surface more extensive than initially apparent.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it can potentially expose sensitive system information that could be leveraged for further exploitation. Remote attackers who successfully exploit this vulnerability can access configuration files, database files, user credentials, application source code, and other sensitive data that may be stored within the system's file structure. This exposure creates a significant risk for organizations relying on these legacy bulletin board systems, as it provides attackers with potential access to internal system information that could be used for privilege escalation, lateral movement, or additional attack vectors. The vulnerability's impact is particularly severe given that it affects multiple variants of the same software family, suggesting a systemic flaw in the codebase rather than isolated incidents.
Organizations affected by this vulnerability should prioritize immediate remediation through the application of security patches released by the software vendors. The recommended solution involves upgrading to version 1.03 or later of the affected software, which includes proper input validation and sanitization mechanisms to prevent directory traversal attacks. Additionally, system administrators should implement network-level controls such as web application firewalls and access control lists to limit exposure to known attack patterns. Security monitoring should include detection of suspicious file access patterns and directory traversal attempts, with logging and alerting mechanisms configured to identify potential exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date security practices and the critical need for proper input validation in web applications, aligning with ATT&CK technique T1059.007 for command and scripting interpreter and T1566.001 for spearphishing attachments, as attackers may leverage such vulnerabilities to establish persistent access or escalate privileges within compromised environments.