CVE-2006-3685 in CzarNews
Summary
by MITRE
PHP remote file inclusion vulnerability in CzarNews 1.12 through 1.14 allows remote attackers to execute arbitrary PHP code via a URL in the tpath parameter to cn_config.php. NOTE: the news.php vector is already covered by CVE-2005-0859.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 07/06/2024
The vulnerability identified as CVE-2006-3685 represents a critical remote file inclusion flaw affecting CzarNews versions 1.12 through 1.14. This vulnerability resides within the cn_config.php script where the tpath parameter is processed without adequate input validation, creating an avenue for malicious actors to inject and execute arbitrary PHP code on the target system. The flaw operates through a classic remote code execution vector where an attacker can manipulate the tpath parameter with a malicious URL, effectively allowing the application to include and execute remote PHP code. This vulnerability directly maps to CWE-88, which describes improper neutralization of special elements used in an OS command, and more specifically to CWE-94, which covers the execution of arbitrary code due to improper input validation. The issue demonstrates a fundamental lack of proper input sanitization and secure coding practices in the application's configuration handling mechanism.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the ability to fully compromise the affected system. Once exploited, an attacker can execute arbitrary commands with the privileges of the web server process, potentially leading to complete system takeover. The vulnerability affects the web application's configuration file processing logic where user-supplied input is directly incorporated into file inclusion operations without proper validation or sanitization. This creates a pathway for attackers to load malicious PHP scripts from remote servers, effectively allowing them to establish persistent access, exfiltrate data, or deploy additional malicious payloads. The exploitation requires minimal privileges and can be automated, making it particularly dangerous in environments where the web application is accessible from the internet. According to ATT&CK framework, this vulnerability aligns with T1190 for exploitation of remote services and T1059 for command and scripting interpreter usage, representing a significant threat to system integrity and confidentiality.
Mitigation strategies for CVE-2006-3685 must address both immediate remediation and long-term security hardening measures. The primary fix involves disabling the remote file inclusion functionality by modifying the application configuration to prevent the tpath parameter from accepting URLs or external references. This can be achieved by implementing strict input validation that rejects any URL schemes or external references within the parameter. Additionally, the application should be updated to a patched version that properly sanitizes user input before processing. Security measures should include disabling the allow_url_fopen and allow_url_include directives in php.ini to prevent PHP from loading files from remote locations. Network-level protections such as firewall rules and web application firewalls should be configured to block suspicious requests containing URL patterns. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other applications. The vulnerability also highlights the importance of following secure coding practices such as input validation, output encoding, and principle of least privilege. Organizations should implement comprehensive patch management processes to ensure timely updates of vulnerable applications and maintain up-to-date security configurations. The remediation process should include comprehensive testing to verify that the vulnerability has been properly addressed without introducing new issues, and monitoring should be implemented to detect potential exploitation attempts.