CVE-2006-3690 in MiniBB
Summary
by MITRE
Multiple PHP remote file inclusion vulnerabilities in MiniBB Forum 1.5a and earlier allow remote attackers to execute arbitrary PHP code via a URL in the absolute_path parameter to (1) components/com_minibb.php or (2) components/minibb/index.php.
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Analysis
by VulDB Data Team • 07/07/2024
The vulnerability identified as CVE-2006-3690 represents a critical remote file inclusion flaw affecting MiniBB Forum versions 1.5a and earlier. This vulnerability resides within the forum's component handling logic where user-supplied input is directly incorporated into file path constructions without adequate validation or sanitization. The flaw specifically manifests in two primary locations: components/com_minibb.php and components/minibb/index.php, where the absolute_path parameter becomes a vector for malicious code execution. The vulnerability falls under the category of CWE-98, which describes improper input validation leading to inclusion of files from untrusted sources, making it a classic example of a remote code execution vulnerability.
Attackers can exploit this vulnerability by crafting malicious URLs that contain arbitrary PHP code within the absolute_path parameter. When the vulnerable forum software processes these requests, it attempts to include and execute the specified remote files, effectively allowing attackers to inject and run arbitrary PHP code on the target server. This type of vulnerability is particularly dangerous because it provides attackers with direct execution capabilities on the web server, potentially enabling them to access sensitive data, modify content, or establish persistent access to the compromised system. The attack surface is amplified by the fact that the vulnerability affects core forum components that are typically accessible through standard web interfaces.
The operational impact of this vulnerability extends beyond simple code execution, as it can lead to complete system compromise when combined with other attack vectors or when the web server has elevated privileges. The vulnerability allows for privilege escalation scenarios where attackers can potentially gain administrative access to the forum, modify user permissions, or even access the underlying database. From an attacker's perspective, this represents a low-effort, high-impact exploit that can be automated and leveraged for various malicious purposes including data exfiltration, defacement, or establishing backdoors. The vulnerability's classification under ATT&CK technique T1190 - Exploit Public-Facing Application, demonstrates how attackers can leverage publicly accessible web applications to gain initial access to target networks.
Mitigation strategies for this vulnerability primarily focus on immediate patching and input validation improvements. Organizations should prioritize updating to patched versions of MiniBB Forum where the absolute_path parameter is properly validated and sanitized before being used in file inclusion operations. Additionally, implementing proper input validation that filters or rejects suspicious URL patterns, particularly those containing remote file references, provides an effective defense-in-depth approach. Network-level protections such as web application firewalls can help detect and block malicious requests attempting to exploit this vulnerability, though they should not be considered a replacement for proper code-level fixes. The vulnerability's remediation aligns with security best practices outlined in OWASP Top Ten and NIST guidelines for preventing remote file inclusion attacks, emphasizing the critical importance of input validation and secure coding practices in preventing such widespread exploitation opportunities.