CVE-2000-0634 in Communigate Pro
Summary
by MITRE
The web administration interface for CommuniGate Pro 3.2.5 and earlier allows remote attackers to read arbitrary files via a .. (dot dot) attack.
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Analysis
by VulDB Data Team • 10/13/2025
The vulnerability identified as CVE-2000-0634 represents a critical directory traversal flaw within the web administration interface of CommuniGate Pro versions 3.2.5 and earlier. This security weakness stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied paths before processing file requests through the web interface. The flaw specifically enables malicious actors to exploit the system's file handling routines by crafting specially formatted requests containing directory traversal sequences such as .. or %2e%2e. The vulnerability operates at the application layer and can be exploited remotely without requiring authentication credentials, making it particularly dangerous for systems with exposed web administration interfaces.
The technical implementation of this vulnerability leverages the fundamental weakness in path resolution logic where the application does not adequately validate or sanitize the input parameters that specify file paths. When a user submits a request containing directory traversal sequences, the web application processes these inputs without proper sanitization, allowing the attacker to navigate outside the intended directory structure and access files that should remain restricted. This type of flaw 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. The vulnerability demonstrates a classic lack of input validation and output encoding practices that are fundamental to secure software development.
The operational impact of CVE-2000-0634 extends beyond simple unauthorized file access, potentially enabling attackers to extract sensitive information including configuration files, user credentials, application source code, and system files that could reveal critical system information. In the context of CommuniGate Pro, which serves as an email server and collaboration platform, successful exploitation could lead to compromise of email communications, user account credentials, and potentially full system control. The vulnerability aligns with ATT&CK technique T1083, which describes discovery of file and directory permissions, and T1566, which covers credential access through various attack vectors. Organizations running affected versions face significant risk of data breaches and system compromise, particularly when the web administration interface is accessible from untrusted networks.
Mitigation strategies for this vulnerability require immediate patching of affected CommuniGate Pro installations to versions that properly implement input validation and path sanitization. System administrators should disable or restrict access to the web administration interface when possible, implementing network segmentation to limit exposure to trusted networks only. Additional protective measures include implementing web application firewalls to detect and block directory traversal attempts, enforcing strict input validation at all application entry points, and conducting regular security assessments to identify similar vulnerabilities in other applications. The remediation process should also involve reviewing and hardening the application's file access controls, ensuring that all file operations properly validate path parameters against expected directories and implement proper access controls to prevent unauthorized file system access. Organizations should also consider implementing automated monitoring solutions to detect suspicious file access patterns that may indicate exploitation attempts.