CVE-2009-4511 in TANDBERG Video Communication Server
Summary
by MITRE
Multiple directory traversal vulnerabilities in the web administration interface on the TANDBERG Video Communication Server (VCS) before X5.1 allow remote authenticated users to read arbitrary files via a .. (dot dot) in the page parameter to (1) helppage.php or (2) user/helppage.php.
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Analysis
by VulDB Data Team • 09/03/2025
The CVE-2009-4511 vulnerability represents a critical directory traversal flaw in the TANDBERG Video Communication Server (VCS) web administration interface prior to version X5.1. This vulnerability specifically affects the help page functionality within the system's web interface, creating a pathway for authenticated remote attackers to access arbitrary files on the underlying filesystem. The vulnerability stems from insufficient input validation in the page parameter handling within two specific PHP scripts: helppage.php and user/helppage.php. These scripts fail to properly sanitize user-supplied input, allowing attackers to manipulate file paths through the use of directory traversal sequences such as .. (dot dot) in the page parameter.
The technical exploitation of this vulnerability requires an attacker to possess valid authentication credentials to access the web administration interface, which significantly reduces the attack surface compared to unauthenticated vulnerabilities. However, the impact remains severe as authenticated users typically have elevated privileges and access to sensitive system information. When an attacker submits a malicious page parameter containing directory traversal sequences to either of the affected PHP scripts, the application processes these sequences without proper validation, resulting in unauthorized file access. This flaw directly violates security principles by allowing path traversal attacks that can potentially expose sensitive system files, configuration data, and other confidential information stored on the server.
The operational impact of CVE-2009-4511 extends beyond simple information disclosure, as it can enable attackers to gain deeper insights into the system architecture and potentially escalate their privileges. Attackers can leverage this vulnerability to access system configuration files, log files, and other sensitive data that may contain credentials, system settings, or other information useful for further exploitation. The vulnerability affects the integrity and confidentiality of the affected system, potentially leading to complete system compromise if sensitive configuration data is exposed. According to CWE classification, this vulnerability maps to CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The ATT&CK framework categorizes this vulnerability under T1083 (File and Directory Discovery) and T1566 (Phishing), as attackers can use this weakness to discover sensitive files and potentially craft targeted phishing attacks based on the information obtained.
Organizations using TANDBERG VCS systems prior to X5.1 should implement immediate mitigations including applying the vendor-provided security patches, implementing network segmentation to restrict access to the web administration interface, and enforcing strict access controls for administrative accounts. The most effective remediation involves upgrading to version X5.1 or later, which includes proper input validation and sanitization for the affected PHP scripts. Additionally, implementing web application firewalls that can detect and block directory traversal attempts, conducting regular security audits of web applications, and establishing robust monitoring for unusual file access patterns can help prevent exploitation of this vulnerability. The vulnerability also highlights the importance of input validation in web applications and demonstrates how seemingly minor flaws in parameter handling can lead to significant security implications, particularly in administrative interfaces where privileged access is granted.