CVE-2004-1203 in phpCMS
Summary
by MITRE
parser.php in phpCMS 1.2.1 and earlier, with non-stealth and debug modes enabled, allows remote attackers to gain sensitive information via an invalid file parameter, which reveals the web server s installation path.
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Analysis
by VulDB Data Team • 07/06/2025
The vulnerability described in CVE-2004-1203 affects phpCMS version 1.2.1 and earlier, specifically when the application operates in non-stealth and debug modes. This security flaw represents a classic information disclosure vulnerability that can significantly impact the security posture of affected systems. The vulnerability arises from improper error handling within the parser.php script, which fails to sanitize user input when processing file parameters. When an invalid file parameter is submitted to the application, the system inadvertently reveals critical system information including the web server's installation path through error messages or response content.
This type of vulnerability falls under the Common Weakness Enumeration category CWE-200, which specifically addresses "Information Exposure," and more broadly relates to CWE-1234 which deals with "Weaknesses in Error Handling." The flaw demonstrates poor input validation practices where the application does not properly validate or sanitize the file parameter before processing it. The debug mode configuration exacerbates the issue by enabling verbose error reporting, which provides attackers with detailed system information that would otherwise be hidden in production environments. The vulnerability is particularly dangerous because it exposes the absolute file path of the web server installation, which can serve as a critical piece of information for attackers planning further exploitation attempts.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with foundational knowledge necessary for subsequent attacks. Knowledge of the web server installation path enables attackers to craft more targeted attacks, including directory traversal attempts, file inclusion exploits, or other path-based vulnerabilities. The vulnerability is remotely exploitable, meaning attackers do not require physical access or local system credentials to discover this sensitive information. This characteristic makes it particularly dangerous in web applications where the attack surface is already large and accessible over the network. The vulnerability also demonstrates a fundamental security misconfiguration issue where debug modes should never be enabled in production environments, as they provide excessive information to potential attackers.
Mitigation strategies for this vulnerability should focus on multiple layers of defense. The primary recommendation involves disabling debug and non-stealth modes in production environments, as these configurations should only be enabled during development or testing phases. The application code must be updated to properly validate and sanitize all file parameters before processing, implementing input validation that rejects malformed or potentially dangerous inputs. The parser.php script should be modified to handle error conditions gracefully without revealing system paths or internal application structure details. Additionally, implementing proper access controls and input sanitization mechanisms can prevent this type of information leakage. Organizations should also conduct regular security audits to ensure that debug modes are not inadvertently enabled in production environments, and implement proper logging and monitoring to detect unusual parameter submissions that might indicate exploitation attempts. This vulnerability highlights the importance of following the principle of least privilege and the security principle of defense in depth, where multiple controls work together to protect against various attack vectors. The vulnerability also aligns with ATT&CK technique T1212, which involves exploitation of information disclosure vulnerabilities to gain additional system information for further attacks, emphasizing the need for comprehensive security controls throughout the application lifecycle.