CVE-2007-0863 in Trevorchan
Summary
by MITRE
** DISPUTED ** PHP remote file inclusion vulnerability in Trevorchan 0.7 and earlier allows remote attackers to execute arbitrary code via the tc_config[rootdir] parameter to (1) upgrade.php, (2) paint_save.php, (3) menu.php, (4) manage.php, and (5) banned.php. NOTE: his issue has been disputed by reliable third parties, who state that the variable is set before use in config.php.
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Analysis
by VulDB Data Team • 08/07/2024
The vulnerability identified as CVE-2007-0863 represents a disputed remote file inclusion flaw within the Trevorchan 0.7 content management system and earlier versions. This type of vulnerability falls under the category of insecure direct object references and represents a critical security weakness that could potentially allow attackers to execute arbitrary code on vulnerable systems. The vulnerability specifically targets the tc_config[rootdir] parameter, which when manipulated through specific script files, could enable unauthorized code execution. The affected files include upgrade.php, paint_save.php, menu.php, manage.php, and banned.php, all of which are part of the core application functionality. This vulnerability is particularly concerning as it demonstrates how configuration parameters can become attack vectors when not properly validated or sanitized.
The technical flaw manifests in the improper handling of user-supplied input within the application's configuration management system. When attackers provide malicious input through the tc_config[rootdir] parameter, the application fails to properly validate or sanitize this input before using it in file inclusion operations. This creates a condition where attacker-controlled data can be interpreted as a file path, leading to the inclusion of remote files that may contain malicious code. The vulnerability operates at the intersection of input validation failures and dynamic code execution, making it particularly dangerous for web applications that rely on user input for configuration parameters. According to CWE-98, this represents a form of insecure direct object reference where the application uses user-supplied input to construct file paths without proper validation, allowing attackers to access unintended resources.
The operational impact of this vulnerability extends beyond simple code execution to encompass potential complete system compromise. Attackers could leverage this vulnerability to upload and execute malicious scripts, gain unauthorized access to sensitive data, or establish persistent backdoors within the affected systems. The fact that multiple files are affected increases the attack surface and provides multiple potential entry points for threat actors. This vulnerability is particularly dangerous in environments where the application runs with elevated privileges, as it could potentially allow attackers to escalate their privileges or compromise entire server infrastructures. The remote nature of the attack means that exploitation can occur from anywhere on the internet without requiring physical access to the target system. According to ATT&CK framework, this vulnerability maps to T1190 - Exploit Public-Facing Application, highlighting the threat actor's ability to exploit publicly accessible web applications to gain initial access to target systems.
The disputed nature of this vulnerability stems from third-party analysis indicating that the tc_config[rootdir] variable is actually set before use in config.php, suggesting that the vulnerability may not exist as originally reported. However, this dispute does not negate the importance of understanding the underlying principles of secure coding practices that could prevent similar vulnerabilities in other applications. The controversy surrounding this specific CVE highlights the complexity of vulnerability analysis and the importance of thorough validation before accepting reported security issues. Security professionals must remain vigilant in examining reported vulnerabilities while considering the possibility of false positives or misinterpretations of the actual code behavior. This case demonstrates the necessity of conducting independent verification of security claims and the importance of understanding the actual code implementation rather than relying solely on reported descriptions. Organizations should implement comprehensive input validation measures and avoid direct use of user-supplied data in file inclusion operations to prevent similar vulnerabilities from affecting their systems.
The recommended mitigations for this class of vulnerability involve implementing strict input validation and sanitization measures throughout the application code. Developers should avoid using user-supplied input directly in file inclusion operations and instead implement whitelisting mechanisms for acceptable values. Proper configuration management practices should ensure that configuration parameters are validated and sanitized before being used in any dynamic operations. Organizations should also implement web application firewalls and input validation rules to detect and block suspicious patterns in incoming requests. Regular security code reviews and vulnerability assessments should be conducted to identify and remediate similar issues before they can be exploited by malicious actors. The principles of least privilege and defense in depth should be applied to minimize the potential impact of any successful exploitation attempts.