CVE-2006-0686 in Virtual Hosting Control System
Summary
by MITRE
add_user.php in Virtual Hosting Control System (VHCS) 2.4.7.1 and earlier does not check user privileges when adding a new administrative user, which allows remote attackers to gain unauthorized access.
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Analysis
by VulDB Data Team • 08/01/2017
The vulnerability identified as CVE-2006-0686 resides within the Virtual Hosting Control System version 2.4.7.1 and earlier, specifically in the add_user.php component. This flaw represents a critical privilege escalation vulnerability that undermines the fundamental security model of the system. The VHCS platform serves as a web hosting control panel that manages virtual hosting environments, making it a prime target for attackers seeking unauthorized administrative access. The vulnerability manifests when the system fails to perform proper authentication checks before allowing user creation operations, creating a pathway for malicious actors to bypass normal access controls and elevate their privileges.
This security flaw operates through a classic insufficient privilege checking mechanism, classified under CWE-284 which addresses improper access control issues. The technical implementation of add_user.php does not validate whether the requesting user possesses the necessary administrative rights to create new administrative accounts. This oversight allows any authenticated user, regardless of their permission level, to execute the user creation function and potentially establish accounts with elevated privileges. The vulnerability exists at the application logic level where access control decisions are made, demonstrating poor security design principles that violate the principle of least privilege. Attackers can exploit this weakness by simply submitting a request to the add_user.php endpoint with appropriate parameters to create new administrative accounts without proper authorization.
The operational impact of CVE-2006-0686 is severe and far-reaching, as it enables remote attackers to gain complete administrative control over the affected VHCS installation. This unauthorized access can lead to complete system compromise, data exfiltration, service disruption, and potential lateral movement within the network infrastructure. The vulnerability's remote exploitability means attackers do not require physical access or local system credentials to leverage the flaw. Once an attacker establishes administrative access through this vulnerability, they can modify system configurations, create backdoors, steal sensitive information, and potentially use the compromised system as a launch point for further attacks against other network segments. The impact extends beyond the immediate system compromise to include potential regulatory compliance violations and reputation damage for organizations relying on the affected hosting infrastructure.
Mitigation strategies for CVE-2006-0686 should focus on immediate patching and access control reinforcement. Organizations must upgrade to VHCS versions that address this privilege escalation vulnerability, as the original affected versions are no longer supported and lack security updates. System administrators should implement network segmentation and firewall rules to limit access to administrative interfaces, reducing the attack surface for remote exploitation attempts. The vulnerability aligns with ATT&CK technique T1078 which covers legitimate credentials use, as attackers can leverage this flaw to establish persistent administrative access. Additional defensive measures include implementing robust logging and monitoring of user creation activities, enforcing multi-factor authentication for administrative accounts, and conducting regular security assessments to identify similar privilege checking deficiencies in other applications. Security teams should also consider implementing intrusion detection systems that can identify suspicious user creation patterns and anomalous access attempts that may indicate exploitation of this vulnerability.