CVE-2006-7100 in Insert User
Summary
by MITRE
PHP remote file inclusion vulnerability in includes/functions_mod_user.php in phpBB Insert User 0.1.2 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the phpbb_root_path parameter.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/28/2024
The vulnerability identified as CVE-2006-7100 represents a critical remote file inclusion flaw in the phpBB Insert User mod version 0.1.2 and earlier. This security weakness resides within the functions_mod_user.php file and demonstrates a classic path traversal vulnerability that enables malicious actors to inject and execute arbitrary PHP code on affected systems. The flaw specifically manifests when the phpbb_root_path parameter is improperly validated, creating an opportunity for remote code execution through crafted URL inputs. This vulnerability type falls under the broader category of CWE-88, which encompasses improper neutralization of special elements used in an OS command, and more specifically aligns with CWE-94, representing improper execution of code. The attack vector leverages the insecure handling of user-supplied input that gets directly incorporated into file inclusion operations without proper sanitization or validation mechanisms.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the capability to gain full control over the affected web server. When exploited, the vulnerability allows remote attackers to execute arbitrary PHP code with the privileges of the web server process, potentially enabling them to access sensitive data, modify system configurations, or establish persistent backdoors. The vulnerability's severity is compounded by the fact that it affects a widely used forum software platform, making it an attractive target for automated attacks and exploitation campaigns. The flaw demonstrates a failure in input validation and secure coding practices, as the application does not properly sanitize the phpbb_root_path parameter before using it in file inclusion operations, creating a direct path for malicious code injection.
Security professionals should recognize this vulnerability as a prime example of how insecure file inclusion patterns can lead to complete system compromise. The ATT&CK framework categorizes this type of vulnerability under T1190, known as "Exploit Public-Facing Application," where adversaries target applications accessible from external networks. The vulnerability also maps to T1059.007, representing "Command and Scripting Interpreter: PHP," indicating how attackers can leverage PHP execution capabilities to gain system control. Mitigation strategies should include immediate patching of affected phpBB Insert User modules to version 0.1.3 or later, which contains the necessary security fixes. Additionally, administrators should implement proper input validation, disable remote file inclusion features, and consider implementing web application firewalls to detect and block malicious requests attempting to exploit this vulnerability. The remediation process must also include thorough code review to ensure similar insecure practices are not present in other components of the application, as this vulnerability represents a fundamental flaw in secure coding principles that should be addressed through comprehensive security awareness training and code auditing procedures.