CVE-2007-2257 in Fully Modded phpBB2
Summary
by MITRE
PHP remote file inclusion vulnerability in subscp.php in Fully Modded phpBB2 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 • 09/01/2025
The vulnerability identified as CVE-2007-2257 represents a critical remote file inclusion flaw affecting the Fully Modded phpBB2 forum software. This vulnerability resides within the subscp.php script and demonstrates a classic security weakness that has been prevalent in web applications for many years. The flaw allows malicious actors to inject and execute arbitrary PHP code by manipulating the phpbb_root_path parameter through URL inputs, creating a pathway for remote code execution that can compromise entire web servers.
The technical implementation of this vulnerability stems from improper input validation and sanitization within the phpBB2 framework's handling of user-supplied parameters. When the subscp.php script processes the phpbb_root_path parameter without adequate validation, it becomes susceptible to manipulation by attackers who can inject malicious URLs or file paths. This weakness directly maps to CWE-88, which describes improper neutralization of special elements used in an OS command, and more specifically to CWE-94, which addresses the execution of arbitrary code or commands. The vulnerability exploits the trust placed in user inputs and demonstrates how insufficient parameter validation can lead to complete system compromise.
From an operational perspective, this vulnerability creates significant risk for organizations relying on phpBB2 forums, as it enables remote attackers to execute malicious code with the privileges of the web server process. The impact extends beyond simple code execution to potentially allow attackers to gain full control over the affected server, access sensitive data, install backdoors, or use the compromised system as a launch point for further attacks within the network. The vulnerability is particularly dangerous because it requires minimal user interaction to exploit and can be automated through various attack vectors, making it a prime target for mass exploitation campaigns.
The threat landscape surrounding this vulnerability aligns with ATT&CK technique T1059.007, which covers scripting languages and T1190, which addresses exploitation of remote services. Organizations with vulnerable phpBB2 installations face the risk of being compromised through automated scanning tools that specifically target known remote file inclusion vulnerabilities. The attack surface is broad since phpBB2 installations are commonly found on web servers worldwide, and the exploitation process requires only basic knowledge of web application security principles. Security professionals should note that this vulnerability represents a classic example of how insecure parameter handling can lead to catastrophic security breaches.
Mitigation strategies for CVE-2007-2257 involve immediate patching of the affected phpBB2 installation to the latest secure version that addresses this specific vulnerability. System administrators should also implement proper input validation measures, disable remote file inclusion features in PHP configurations, and apply web application firewalls to monitor and block suspicious URL patterns. Additionally, organizations should conduct comprehensive security audits of their web applications, implement secure coding practices, and establish regular vulnerability assessment procedures to identify similar weaknesses in their software infrastructure. The remediation process should include disabling unnecessary features, applying the principle of least privilege, and ensuring that all web applications are regularly updated with security patches to prevent exploitation of known vulnerabilities.