CVE-2012-2999 in FTP Server
Summary
by MITRE
Multiple cross-site request forgery (CSRF) vulnerabilities in the web interface in Cerberus FTP Server before 5.0.5.0 allow remote attackers to hijack the authentication of administrators for requests that (1) add a user account or (2) reconfigure the state of the FTP service, as demonstrated by a request to usermanager/users/modify.
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Analysis
by VulDB Data Team • 08/11/2024
The CVE-2012-2999 vulnerability represents a critical cross-site request forgery flaw discovered in Cerberus FTP Server versions prior to 5.0.5.0, specifically affecting the web-based administrative interface. This vulnerability operates within the context of web application security where unauthorized attackers can exploit the lack of proper authentication verification mechanisms to perform administrative actions on behalf of legitimate administrators. The flaw exists in the server's web interface implementation, which fails to validate the origin of requests, making it susceptible to CSRF attacks that can be executed through malicious web pages or email attachments.
The technical implementation of this vulnerability stems from the absence of anti-CSRF tokens or other validation mechanisms in the web interface forms and API endpoints. When administrators perform administrative tasks such as adding new user accounts or modifying FTP service configurations, the application does not properly verify that these requests originate from legitimate administrative sessions. This allows attackers to craft malicious web pages that automatically submit requests to the vulnerable FTP server, leveraging the administrator's existing authenticated session to execute unauthorized operations. The vulnerability specifically affects the usermanager/users/modify endpoint, which serves as a critical interface for user management and service reconfiguration.
The operational impact of this vulnerability is severe as it provides attackers with elevated privileges within the FTP server environment. An attacker who successfully exploits this CSRF vulnerability can add new administrative accounts, modify existing user permissions, change service configurations, and potentially gain persistent access to the system. The ability to hijack administrative authentication sessions means that attackers can effectively take control of the entire FTP server infrastructure, potentially leading to data exfiltration, service disruption, or further lateral movement within network environments. This vulnerability essentially allows for complete compromise of the FTP server's administrative functions without requiring direct authentication credentials.
Mitigation strategies for CVE-2012-2999 should focus on implementing proper CSRF protection mechanisms such as anti-CSRF tokens, origin validation checks, and implementing the principle of least privilege for administrative interfaces. Organizations should immediately upgrade to Cerberus FTP Server version 5.0.5.0 or later, which includes the necessary security patches addressing this vulnerability. The implementation of Content Security Policy headers, proper session management, and regular security assessments of web interfaces should be enforced to prevent similar vulnerabilities. This vulnerability aligns with CWE-352, which specifically addresses Cross-Site Request Forgery issues, and represents a common attack pattern documented in the MITRE ATT&CK framework under the technique of privilege escalation through web application exploitation.
The broader implications of this vulnerability extend beyond the immediate FTP server compromise, as it demonstrates how web interface security flaws can lead to complete system compromise. Organizations should conduct comprehensive security audits of their web-based administrative interfaces and implement robust input validation and request origin verification mechanisms. The vulnerability also highlights the importance of keeping software components updated and following security best practices for web application development and deployment. Regular penetration testing and vulnerability assessments should include examination of CSRF protections in all web applications and administrative interfaces to prevent similar exploitation scenarios.