CVE-2011-3839 in Wuzly
Summary
by MITRE
The administration functionality in Wuzly 2.0 allows remote attackers to bypass authentication by setting the dXNlcm5hbWU cookie.
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Analysis
by VulDB Data Team • 02/13/2019
The vulnerability identified as CVE-2011-3839 represents a critical authentication bypass flaw within the administrative interface of Wuzly 2.0 web application. This issue stems from improper handling of session management mechanisms, specifically targeting the authentication cookie validation process. The vulnerability allows remote attackers to gain unauthorized administrative access without proper credentials, fundamentally compromising the security posture of affected systems. The flaw demonstrates a classic weakness in web application security where cookie-based authentication mechanisms fail to properly validate user credentials or session integrity, creating an exploitable path for malicious actors to escalate privileges.
The technical implementation of this vulnerability involves manipulation of the dXNlcm5hbWU cookie value, which appears to be a base64 encoded representation of the username parameter. When an attacker sets this specific cookie value, the application fails to properly validate the authentication state and grants administrative privileges to the user. This indicates a fundamental flaw in the application's session management and authentication logic, where the system relies on client-side cookie values without proper server-side verification mechanisms. The vulnerability operates at the application layer and can be exploited remotely without requiring any prior authentication or specialized tools beyond basic web browser capabilities. This type of flaw falls under the category of weak session management as defined by CWE-613, which specifically addresses insufficient session validation mechanisms.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with complete administrative control over the affected Wuzly 2.0 installation. This includes the ability to modify user accounts, access sensitive data, alter application configurations, and potentially compromise the entire underlying infrastructure. The remote exploitation capability means that attackers can leverage this vulnerability from anywhere on the internet without requiring physical access to the network or system. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and credential access methods, allowing adversaries to move laterally within the network and establish persistent access. The vulnerability also represents a significant risk to data integrity and confidentiality, as administrators typically have unrestricted access to all system resources and user data.
Mitigation strategies for CVE-2011-3839 must address the core authentication bypass mechanism by implementing robust session management practices. Organizations should immediately implement proper authentication validation checks that verify user credentials and session integrity before granting administrative privileges. The application should validate all cookie values server-side and reject any unauthorized modifications to authentication tokens. Security measures should include implementing proper session regeneration after successful authentication, enforcing secure cookie attributes such as HttpOnly and Secure flags, and implementing additional authentication layers beyond simple cookie-based validation. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in the application stack, particularly focusing on session management and authentication mechanisms. The vulnerability also highlights the importance of keeping web applications updated with the latest security patches and following secure coding practices that prevent predictable authentication token generation and manipulation.