CVE-2014-9463 in vBulletin
Summary
by MITRE
functions_vbseo_hook.php in the VBSEO module for vBulletin allows remote authenticated users to execute arbitrary code via the HTTP Referer header to visitormessage.php.
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Analysis
by VulDB Data Team • 05/29/2025
The vulnerability identified as CVE-2014-9463 resides within the VBSEO module for vBulletin, specifically in the functions_vbseo_hook.php file. This represents a critical security flaw that enables remote authenticated attackers to execute arbitrary code on vulnerable systems. The vulnerability manifests through the manipulation of the HTTP Referer header parameter when accessing the visitormessage.php endpoint, creating a path for malicious code injection and execution. The issue demonstrates a classic command injection vulnerability where user-supplied input from the Referer header is not properly sanitized or validated before being processed by the application.
From a technical perspective, this vulnerability operates as a remote code execution flaw that leverages the vBulletin platform's integration with the VBSEO module. The functions_vbseo_hook.php file appears to improperly handle the HTTP Referer header value, allowing attackers to inject malicious payloads that get executed within the context of the web application. This type of vulnerability falls under CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: PowerShell." The authentication requirement for exploitation indicates that attackers must first obtain valid credentials to exploit this vulnerability, though once authenticated, the impact can be severe.
The operational impact of CVE-2014-9463 extends beyond simple code execution to potentially compromise entire web server infrastructures. Successful exploitation allows attackers to execute arbitrary commands with the privileges of the web server process, potentially leading to full system compromise, data exfiltration, or establishment of persistent backdoors. Organizations running vulnerable vBulletin installations with the VBSEO module are at significant risk, as authenticated users can leverage this vulnerability to gain unauthorized access to sensitive data and system resources. The vulnerability affects the core functionality of vBulletin's visitor message system, making it a prime target for exploitation in targeted attacks against forum communities and their users.
Mitigation strategies for this vulnerability should prioritize immediate patching of the affected vBulletin installations and the VBSEO module. Organizations must ensure that all instances of vBulletin are updated to versions that address this specific flaw, with particular attention to the functions_vbseo_hook.php file modifications. Network-level protections including web application firewalls and intrusion detection systems can provide additional defense-in-depth measures, though these should not replace proper patch management. Access controls and user privilege management should be reviewed to limit the potential impact of compromised accounts, while monitoring systems should be configured to detect unusual Referer header patterns that might indicate exploitation attempts. The vulnerability also highlights the importance of input validation and proper sanitization practices, particularly for headers that are not typically considered security-sensitive but can become attack vectors in vulnerable applications.