CVE-2006-6789 in Phpbbxtra
Summary
by MITRE
PHP remote file inclusion vulnerability in includes/archive/archive_topic.php in Phpbbxtra 2.0 allows remote attackers to execute arbitrary PHP code via a URL in the phpbb_root_path parameter.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 08/12/2018
The vulnerability identified as CVE-2006-6789 represents a critical remote file inclusion flaw within the Phpbbxtra 2.0 content management system that exposes systems to arbitrary code execution attacks. This vulnerability specifically affects the includes/archive/archive_topic.php file, which fails to properly validate user-supplied input parameters before incorporating them into file inclusion operations. The issue stems from the application's improper handling of the phpbb_root_path parameter, which accepts external URLs without adequate sanitization or validation mechanisms.
From a technical perspective, this vulnerability operates under the Common Weakness Enumeration category CWE-98, which classifies improper input validation leading to remote file inclusion attacks. The flaw allows malicious actors to inject URLs into the phpbb_root_path parameter, enabling them to load and execute arbitrary PHP code from remote servers. This occurs because the application directly uses user-controllable input in include or require statements without proper filtering or context validation. Attackers can leverage this weakness by crafting malicious URLs that point to attacker-controlled web servers hosting malicious PHP scripts, thereby bypassing normal application security controls and gaining unauthorized access to the target system.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with the capability to completely compromise the affected system. Once exploited, attackers can execute commands with the privileges of the web server process, potentially leading to full system compromise, data theft, or establishment of persistent backdoors. The vulnerability affects the entire Phpbbxtra 2.0 ecosystem, making it particularly dangerous for organizations running this software, as it allows attackers to bypass traditional security measures and gain unauthorized access to sensitive data and system resources. This type of vulnerability also enables attackers to perform reconnaissance activities, escalate privileges, and maintain persistent access to the compromised environment.
Mitigation strategies for this vulnerability should focus on immediate patching and input validation improvements. Organizations must update to the latest versions of Phpbbxtra that address this specific vulnerability, as the original software version contains no built-in protections against such attacks. Additionally, implementing proper input validation and sanitization measures is crucial, including the use of allowlists for valid input values and strict parameter validation. Network-based mitigations such as web application firewalls can help detect and block malicious requests attempting to exploit this vulnerability. The ATT&CK framework categorizes this type of attack under T1190 - Exploit Public-Facing Application, highlighting the importance of securing all application interfaces and implementing proper access controls. System administrators should also consider implementing principle of least privilege for web server accounts and regularly monitoring system logs for suspicious activities that might indicate exploitation attempts.