CVE-2006-5788 in IPrimal Forums
Summary
by MITRE
PHP remote file inclusion vulnerability in (1) index.php and (2) admin/index.php in IPrimal Forums as of 20061105 allows remote attackers to execute arbitrary PHP code via a URL in the p parameter.
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Analysis
by VulDB Data Team • 04/26/2026
The vulnerability described in CVE-2006-5788 represents a critical remote file inclusion flaw affecting IPrimal Forums version 20061105 and earlier. This security weakness resides in two primary files within the application's codebase: index.php and admin/index.php. The vulnerability stems from insufficient input validation and sanitization mechanisms that fail to properly filter user-supplied data before using it in file inclusion operations. Attackers can exploit this weakness by manipulating the p parameter through a URL, which then gets processed by the application's file inclusion functions. The flaw allows malicious actors to inject arbitrary PHP code that gets executed on the target server, effectively granting remote code execution capabilities.
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. This weakness enables attackers to manipulate the application's behavior by injecting malicious file paths or URLs into the p parameter. The vulnerability operates at the application layer and can be classified under the ATT&CK technique T1190 - Exploit Public-Facing Application, as it targets publicly accessible web interfaces. The flaw demonstrates a classic lack of proper input validation and the dangerous practice of directly incorporating user-provided data into file inclusion operations without adequate sanitization or whitelisting mechanisms.
The operational impact of this vulnerability is severe and multifaceted. Successful exploitation allows attackers to execute arbitrary code with the privileges of the web server process, potentially leading to complete system compromise. Attackers can leverage this weakness to upload malware, establish backdoors, or use the compromised server as a launch point for further attacks against internal networks. The vulnerability affects both regular user interfaces and administrative sections of the forum, meaning that even basic forum access can be exploited to gain elevated privileges. Additionally, the remote nature of the attack means that exploitation can occur from anywhere on the internet without requiring physical access to the target system.
Mitigation strategies for this vulnerability should focus on immediate defensive measures and long-term architectural improvements. The most critical immediate action involves implementing proper input validation and sanitization for all user-supplied parameters, particularly those used in file inclusion operations. Developers should employ whitelisting approaches for file paths and avoid direct user input incorporation into include statements. The application should validate that any file paths or URLs used in the p parameter conform to expected patterns and reject any that appear suspicious or contain potentially dangerous characters. Additionally, the PHP configuration should be adjusted to disable remote file inclusion features when possible, and the principle of least privilege should be enforced to limit the web server's capabilities. System administrators should also implement network-level protections such as firewalls and intrusion detection systems to monitor for exploitation attempts and restrict access to vulnerable applications. Regular security updates and vulnerability assessments should be conducted to prevent similar issues from arising in the future.