CVE-2007-1818 in Forum picture
Summary
by MITRE
PHP remote file inclusion vulnerability in MOD_forum_fields_parse.php in the Forum picture and META tags 1.7 module for phpBB allows remote attackers to execute arbitrary PHP code via a URL in the phpbb_root_path parameter.
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Analysis
by VulDB Data Team • 09/02/2024
The vulnerability described in CVE-2007-1818 represents a critical remote file inclusion flaw within the Forum picture and META tags 1.7 module for phpBB, a widely used bulletin board system. This vulnerability specifically affects the MOD_forum_fields_parse.php script which is part of a third-party modification designed to enhance forum functionality with picture and metadata handling capabilities. The flaw arises from insufficient input validation and sanitization within the phpbb_root_path parameter, creating an exploitable condition that allows malicious actors to inject and execute arbitrary PHP code on vulnerable systems.
The technical nature of this vulnerability aligns with CWE-88, which describes improper neutralization of special elements used in an expression, specifically in the context of remote file inclusion attacks. The vulnerability operates by accepting user-controllable input through the phpbb_root_path parameter without proper validation, allowing attackers to manipulate the script execution flow. When a malicious URL is passed as the phpbb_root_path value, the vulnerable script incorporates and executes code from the remote location, effectively providing attackers with a backdoor to execute arbitrary commands on the target server. This type of vulnerability falls under the ATT&CK technique T1190 - Exploit Public-Facing Application, where attackers target web applications to gain unauthorized access and execute malicious code.
The operational impact of this vulnerability is severe and multifaceted, as it provides remote attackers with complete control over the affected phpBB installation. Successful exploitation can result in full system compromise, data exfiltration, and the ability to establish persistent access through the execution of malicious code. Attackers can leverage this vulnerability to deploy web shells, install malware, or modify forum content to spread further attacks. The vulnerability affects systems running phpBB with the specific MOD_forum_fields_parse.php module installed, making it particularly dangerous for organizations that have not updated their forum software or applied security patches. The remote nature of the exploit means that attackers do not require physical access or local network presence to exploit the vulnerability, significantly expanding the attack surface and potential impact.
Mitigation strategies for this vulnerability involve immediate patching and updating of the affected phpBB installation to the latest version that includes security fixes for the module. System administrators should ensure that all third-party modifications are regularly updated and reviewed for security vulnerabilities, as this particular flaw demonstrates the risks associated with unpatched community-developed extensions. Additionally, implementing proper input validation and sanitization measures within the application code can prevent similar vulnerabilities from occurring in the future. Network-level protections such as web application firewalls and intrusion detection systems can help detect and block exploitation attempts. Organizations should also consider disabling remote file inclusion features in their PHP configurations and implementing proper access controls to limit the potential impact of such vulnerabilities. The vulnerability serves as a critical reminder of the importance of maintaining up-to-date software and conducting regular security assessments of web applications and their associated modules.