CVE-2007-3697 in FlashBB
Summary
by MITRE
PHP remote file inclusion vulnerability in phpbb/sendmsg.php in FlashBB 1.1.8 and earlier allows remote attackers to execute arbitrary code via a URL in the phpbb_root_path parameter.
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Analysis
by VulDB Data Team • 09/25/2024
The vulnerability identified as CVE-2007-3697 represents a critical remote file inclusion flaw affecting FlashBB versions 1.1.8 and earlier, specifically within the phpbb/sendmsg.php component. This vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data before incorporating it into file system operations. The issue manifests when the phpbb_root_path parameter receives unfiltered URL input, creating an avenue for malicious actors to inject and execute arbitrary code on the affected system. The vulnerability operates at the application layer and directly impacts the security posture of web applications utilizing this forum software, potentially allowing attackers to gain unauthorized access to system resources and execute malicious commands with the privileges of the web server process.
The technical exploitation of this vulnerability aligns with CWE-88, which describes improper neutralization of special elements used in an OS command, and CWE-94, which encompasses the execution of arbitrary code through the inclusion of untrusted data. Attackers can leverage this weakness by crafting malicious URLs containing shell commands or malicious scripts within the phpbb_root_path parameter. When the vulnerable application processes this input, it attempts to include the specified remote file, effectively executing the attacker-controlled code on the target server. This mechanism enables threat actors to establish persistent access, escalate privileges, or deploy additional malware payloads. The vulnerability's exploitation requires minimal prerequisites and can be automated, making it particularly dangerous in environments where the affected software is publicly accessible.
The operational impact of CVE-2007-3697 extends beyond immediate code execution capabilities to encompass broader system compromise scenarios. Successful exploitation can lead to complete server takeover, data exfiltration, and the establishment of backdoors for continued unauthorized access. Organizations running vulnerable FlashBB installations face significant risks including regulatory compliance violations, data breaches, and reputational damage. The vulnerability's presence in widely used forum software increases the attack surface for cybercriminals who may target multiple systems simultaneously. According to ATT&CK framework category T1190, this vulnerability maps to the exploitation of remote services, while T1059 represents the execution of commands through the compromised system. The affected environment becomes a potential staging ground for further attacks, as attackers can use the compromised server to launch reconnaissance activities against internal networks or as a pivot point for lateral movement.
Mitigation strategies for CVE-2007-3697 require immediate action to address the root cause through proper input validation and sanitization. Organizations should implement strict parameter validation that rejects any non-local file paths or URLs containing suspicious characters. The recommended approach includes disabling remote file inclusion features, implementing whitelisting mechanisms for legitimate paths, and upgrading to patched versions of FlashBB software. Additionally, web application firewalls should be configured to detect and block malicious URL patterns targeting this vulnerability. Security configurations should enforce the use of absolute paths instead of relative or remote references, and administrators should regularly audit file inclusion operations within the application. The implementation of principle of least privilege for web server processes and regular security assessments can further reduce the exploitation risk. Organizations should also consider deploying intrusion detection systems to monitor for suspicious file inclusion patterns and maintain comprehensive backup strategies to ensure rapid recovery in case of successful exploitation attempts.