CVE-2008-4921 in Chipmunk CMS
Summary
by MITRE
board/admin/reguser.php in Chipmunk CMS 1.3 allows remote attackers to bypass authentication and gain administrator privileges via a direct request. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 11/10/2024
The vulnerability identified as CVE-2008-4921 affects Chipmunk CMS version 1.3 and represents a critical authentication bypass flaw that enables remote attackers to escalate their privileges to administrator level. This vulnerability resides within the board/admin/reguser.php component of the CMS, which is responsible for user registration and administrative functions. The flaw allows unauthorized remote attackers to directly access administrative functionality without proper authentication, effectively undermining the entire security model of the content management system.
The technical nature of this vulnerability stems from inadequate input validation and access control mechanisms within the registration and administration interface. When a user makes a direct request to the reguser.php script, the application fails to properly verify whether the requesting user possesses the necessary administrative privileges before executing administrative functions. This represents a classic example of improper access control as classified under CWE-285, where the system does not properly enforce authorization checks for privileged operations. The vulnerability creates a path for attackers to bypass the standard authentication flow and directly invoke administrative functions, essentially providing a backdoor into the system's most sensitive areas.
The operational impact of this vulnerability is severe and far-reaching for any organization utilizing Chipmunk CMS 1.3. Successful exploitation allows attackers to gain full administrative control over the content management system, enabling them to modify or delete content, add or remove users, change system configurations, and potentially access sensitive data stored within the CMS. This privilege escalation capability aligns with ATT&CK technique T1078 which describes legitimate credentials usage for persistence and privilege escalation. The vulnerability also exposes the system to potential data breaches, as administrators typically have access to all content and user information within the CMS, making this a prime target for data exfiltration attacks.
Organizations affected by this vulnerability should immediately implement mitigations to address the authentication bypass issue. The primary remediation involves adding proper access control checks within the reguser.php script to ensure that only authenticated administrators can execute administrative functions. This includes implementing session validation, user role verification, and proper authorization checks before any privileged operations are performed. Additionally, the system should enforce proper input sanitization and validation to prevent malicious requests from being processed. Organizations should also consider implementing network-level protections such as firewall rules to restrict access to administrative endpoints and monitoring for suspicious direct requests to administrative scripts. The vulnerability demonstrates the critical importance of proper access control implementation in web applications and serves as a reminder of the potential consequences when authentication mechanisms are bypassed, making it a significant concern for security professionals implementing or maintaining CMS environments.