CVE-2008-5692 in WS_FTP
Summary
by MITRE
Ipswitch WS_FTP Server Manager before 6.1.1, and possibly other Ipswitch products, allows remote attackers to bypass authentication and read logs via a logLogout action to FTPLogServer/login.asp followed by a request to FTPLogServer/LogViewer.asp with the localhostnull account name.
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Analysis
by VulDB Data Team • 10/28/2024
The vulnerability described in CVE-2008-5692 represents a critical authentication bypass flaw affecting Ipswitch WS_FTP Server Manager versions prior to 6.1.1 and potentially other Ipswitch products. This vulnerability resides in the web-based management interface of the FTP server software, specifically within the logging subsystem that handles user authentication and access control. The flaw stems from improper validation of authentication state during log viewing operations, creating a pathway for unauthenticated attackers to gain access to sensitive system logs and administrative information.
The technical implementation of this vulnerability involves a specific sequence of web requests that exploit a design flaw in the authentication handling mechanism. Attackers can first execute a logLogout action against the FTPLogServer/login.asp endpoint, which appears to properly terminate the current session. However, subsequent requests to FTPLogServer/LogViewer.asp with a specially crafted localhostnull account name parameter can bypass the authentication check and allow access to the log viewer interface. This represents a classic case of insecure direct object reference where the system fails to properly validate whether the requesting user has legitimate access rights to view the requested resource.
The operational impact of this vulnerability extends beyond simple unauthorized log access, as system logs typically contain sensitive information about user activities, system events, and potentially system configuration details. An attacker who successfully exploits this vulnerability could gain insights into system administration activities, user access patterns, and potentially discover other system vulnerabilities through log content analysis. This intelligence gathering capability makes the vulnerability particularly dangerous in environments where the FTP server manages critical business data or serves as part of a larger enterprise infrastructure.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-287 which addresses improper authentication issues, and relates to ATT&CK technique T1078 for valid accounts usage. The flaw demonstrates poor input validation and session management practices that violate fundamental security principles. Organizations should implement immediate mitigations including updating to Ipswitch WS_FTP Server Manager version 6.1.1 or later, which contains the necessary patches to address this authentication bypass. Additionally, network segmentation should be implemented to limit access to the vulnerable web interface, and access controls should be configured to restrict administrative access to trusted network segments only.
Security practitioners should conduct comprehensive vulnerability assessments to identify other potentially affected Ipswitch products within their environment, as the vulnerability description indicates possible impact beyond just the WS_FTP Server Manager. Network monitoring should be enhanced to detect unusual access patterns to log viewer interfaces, and incident response procedures should be updated to address potential exploitation of this vulnerability. The remediation process should include not only software updates but also security configuration reviews to ensure that similar authentication bypass vulnerabilities do not exist in other components of the organization's infrastructure.