CVE-2008-6743 in RSMScript
Summary
by MITRE
RSMScript 1.21 allows remote attackers to bypass authentication and gain administrative privileges by setting the verified cookie to an arbitrary value and performing a direct request to (1) delete.php, (2) edit-submit.php, (3) edit.php, (4) submit.php, and (5) update.php, which bypasses the security check that is performed by verify.php.
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Analysis
by VulDB Data Team • 11/19/2024
The vulnerability identified as CVE-2008-6743 affects RSMScript version 1.21, a content management system that suffers from a critical authentication bypass flaw. This weakness stems from improper session management and insufficient input validation within the application's security architecture. The vulnerability resides in the application's failure to properly verify user credentials before granting administrative access to sensitive operations, creating a pathway for unauthorized actors to escalate their privileges without proper authentication.
The technical implementation of this vulnerability exploits the application's reliance on a cookie named verified for access control purposes. Attackers can manipulate this cookie value to arbitrary inputs, effectively circumventing the authentication mechanism that should normally validate user permissions. The flaw specifically impacts five key administrative endpoints: delete.php, edit-submit.php, edit.php, submit.php, and update.php, all of which are protected by the vulnerable verification process. The application's verify.php script, which should serve as the primary security gatekeeper, fails to properly validate the cookie value, allowing unauthorized access to administrative functions.
This authentication bypass vulnerability creates significant operational risks for affected systems, as it enables remote attackers to perform administrative actions without legitimate credentials. The impact extends beyond simple unauthorized access, as attackers can modify content, delete data, edit configurations, and potentially compromise the entire application. The vulnerability's remote exploitability means that attackers do not require physical access to the system or local network presence, making it particularly dangerous for web applications accessible over the internet. The flaw essentially transforms any authenticated user into an administrator, undermining the fundamental principle of least privilege in security design.
The vulnerability aligns with CWE-287, which addresses improper authentication issues in software systems, and demonstrates poor implementation of access control mechanisms. From an ATT&CK perspective, this vulnerability maps to privilege escalation techniques, specifically T1068, where adversaries leverage application flaws to gain elevated privileges. The attack vector represents a classic example of cookie manipulation and session hijacking, where the attacker manipulates session state information to assume administrative roles. Organizations should implement proper input validation and authentication checks, ensure that all administrative endpoints require proper credential verification, and establish robust session management protocols.
Mitigation strategies should include immediate patching of the affected RSMScript version to address the cookie validation flaw, implementing proper access control checks on all administrative endpoints, and strengthening session management practices. Security teams should conduct comprehensive audits of all authentication mechanisms and ensure that cookie values are properly validated and authenticated before granting access to sensitive functions. Additionally, implementing proper logging and monitoring of administrative activities can help detect unauthorized access attempts. The vulnerability underscores the importance of defense in depth principles, where multiple layers of security controls work together to prevent unauthorized access, rather than relying on a single point of authentication. Organizations should also review their web application security practices to identify similar vulnerabilities in other applications and ensure that proper security testing is conducted during development and deployment phases.