CVE-2008-5693 in WS_FTP
Summary
by MITRE
Ipswitch WS_FTP Server Manager 6.1.0.0 and earlier, and possibly other Ipswitch products, might allow remote attackers to read the contents of custom ASP files in WSFTPSVR/ via a request with an appended dot character.
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Analysis
by VulDB Data Team • 08/04/2019
The vulnerability identified as CVE-2008-5693 affects Ipswitch WS_FTP Server Manager versions 6.1.0.0 and earlier, presenting a critical security flaw that enables remote attackers to access sensitive information stored within custom ASP files. This issue specifically impacts the WSFTPSVR directory structure where ASP files are hosted, creating an unauthorized information disclosure risk that could expose confidential data or application logic to malicious actors. The vulnerability stems from improper input validation and path handling within the web server component, allowing attackers to manipulate file access requests through simple directory traversal techniques.
The technical implementation of this vulnerability involves a flaw in how the WS_FTP Server Manager processes file requests when a dot character is appended to the end of a request. This seemingly innocuous modification exploits a weakness in the server's file resolution mechanism, where the system fails to properly sanitize or validate the input path before attempting to serve the requested ASP file. The vulnerability operates at the application layer and can be exploited through HTTP requests that target the web server's ASP file handling capabilities, making it particularly dangerous as it requires minimal technical expertise to execute. This type of flaw 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 operational impact of this vulnerability extends beyond simple information disclosure, as ASP files often contain sensitive application logic, database connection strings, user credentials, or business-critical data that could be extracted by unauthorized parties. Attackers could potentially access configuration files, application source code, or user data stored within these ASP files, leading to further exploitation opportunities including privilege escalation, data theft, or system compromise. The remote nature of the attack means that adversaries do not need physical access to the system or local network connectivity to exploit this vulnerability, making it particularly concerning for organizations with exposed web servers. According to ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and T1566 (Phishing) as attackers could use the disclosed information to craft more sophisticated social engineering attacks.
Organizations affected by this vulnerability should implement immediate mitigations including updating to the latest version of WS_FTP Server Manager that addresses this issue, applying proper input validation and sanitization to all file access requests, and implementing network segmentation to limit exposure of the affected web server to untrusted networks. Additional protective measures should include regular security assessments of web applications, monitoring for suspicious file access patterns, and implementing web application firewalls to detect and block malicious path traversal attempts. The vulnerability also highlights the importance of proper access controls and least privilege principles, ensuring that web server components do not have unnecessary read access to sensitive directories or files. System administrators should also consider implementing automated patch management processes to ensure timely deployment of security updates and prevent similar vulnerabilities from being exploited in the future.