CVE-2007-2156 in Rezervi Generic
Summary
by MITRE
Multiple PHP remote file inclusion vulnerabilities in Rezervi Generic 0.9 allow remote attackers to execute arbitrary PHP code via a URL in the root parameter to (1) datumVonDatumBis.inc.php, (2) footer.inc.php, (3) header.inc.php, and (4) stylesheets.php in templates/; and (5) wochenuebersicht.inc.php, (6) monatsuebersicht.inc.php, (7) jahresuebersicht.inc.php, and (8) tagesuebersicht.inc.php in belegungsplan/.
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Analysis
by VulDB Data Team • 09/07/2024
The vulnerability identified as CVE-2007-2156 represents a critical remote file inclusion flaw affecting the Rezervi Generic 0.9 web application. This vulnerability resides in the application's handling of user-supplied input through the root parameter, which is processed in multiple include files across different directories. The flaw allows remote attackers to inject malicious URLs that are then executed as PHP code on the target server, creating a severe security risk for any organization using this software. The vulnerability affects multiple include files including datumVonDatumBis.inc.php, footer.inc.php, header.inc.php, and stylesheets.php within the templates directory, as well as several files in the belegungsplan directory such as wochenuebersicht.inc.php, monatsuebersicht.inc.php, jahresuebersicht.inc.php, and tagesuebersicht.inc.php.
This vulnerability directly maps to CWE-88, known as "Improper Neutralization of Argument Delimiters in a Command," and CWE-94, "Improper Control of Generation of Code ('Code Injection')." The technical flaw occurs when the application fails to properly validate or sanitize the root parameter before using it in include or require statements. When an attacker supplies a malicious URL in the root parameter, the application processes this input without adequate sanitization, allowing the PHP interpreter to execute code from the remote location. The vulnerability is particularly dangerous because it affects multiple files throughout the application's codebase, providing attackers with multiple potential attack vectors to exploit the same underlying flaw. The inclusion of files in both the templates and belegungsplan directories demonstrates the widespread nature of this vulnerability across the application's architecture.
The operational impact of this vulnerability is severe and far-reaching for any organization running the affected Rezervi Generic 0.9 application. Attackers can leverage this vulnerability to execute arbitrary PHP code with the privileges of the web server, potentially leading to complete system compromise. The remote nature of the attack means that adversaries can exploit this vulnerability from anywhere on the internet without requiring local access to the system. Successful exploitation could result in data theft, system infiltration, deployment of backdoors, and potential lateral movement within the network. Organizations may face regulatory compliance violations, financial losses, and reputational damage if their systems are compromised through this vulnerability. The vulnerability also aligns with ATT&CK technique T1505.003, "Web Shell," as attackers could deploy web shells through this code execution capability, and T1071.004, "Application Layer Protocol: DNS," if they use DNS-based command and control mechanisms.
Mitigation strategies for this vulnerability should focus on immediate remediation and long-term security improvements. The primary fix involves implementing proper input validation and sanitization for all user-supplied parameters, particularly those used in include or require statements. Organizations should implement a whitelist approach for all file inclusion operations, rejecting any input that does not match predetermined acceptable values. The application should be updated to use absolute paths for included files rather than allowing dynamic parameter-based inclusion. Additionally, the PHP configuration should have allow_url_include disabled to prevent remote file inclusion entirely. Security measures should include implementing proper access controls, conducting regular security audits, and applying the latest security patches to the application. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts. The vulnerability highlights the importance of secure coding practices and input validation, as outlined in the OWASP Top Ten and the SANS Institute's secure coding guidelines, which emphasize the critical need to never trust user input in dynamic code execution contexts.