CVE-2008-4341 in MyBlog
Summary
by MITRE
add.php in MyBlog 0.9.8 and earlier allows remote attackers to bypass authentication and gain administrative access by setting a cookie with admin=yes and login=admin.
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Analysis
by VulDB Data Team • 11/04/2024
The vulnerability described in CVE-2008-4341 represents a critical authentication bypass flaw in MyBlog version 0.9.8 and earlier. This issue resides within the add.php script which is part of the blogging platform's administrative functionality. The vulnerability stems from improper input validation and insecure cookie handling mechanisms that fail to properly verify user credentials before granting administrative privileges. Attackers can exploit this weakness by simply manipulating a cookie value to include admin=yes while maintaining the login parameter set to admin, thereby circumventing the normal authentication process entirely.
From a technical perspective, this vulnerability constitutes a classic case of insecure authentication mechanisms and weak session management. The flaw demonstrates poor security implementation where the application relies on client-side cookie values for privilege escalation rather than implementing proper server-side validation. This type of vulnerability is categorized under CWE-287 which addresses improper authentication issues, and aligns with ATT&CK technique T1078 which covers valid accounts and legitimate credentials for unauthorized access. The vulnerability essentially allows attackers to escalate privileges without needing valid credentials through legitimate authentication channels, making it particularly dangerous for web applications that rely on cookie-based session management.
The operational impact of this vulnerability is severe as it provides attackers with full administrative control over affected MyBlog installations. Once an attacker successfully sets the malicious cookie, they gain complete access to the administrative panel, enabling them to modify content, delete posts, change user permissions, access sensitive data, and potentially compromise the entire web server. This level of access can lead to data breaches, defacement of websites, and potential use as a foothold for further attacks within the network infrastructure. The vulnerability is particularly concerning because it requires no complex exploitation techniques or specialized tools beyond basic web browser cookie manipulation.
Mitigation strategies for this vulnerability should focus on implementing proper authentication controls and server-side validation of administrative privileges. Organizations should immediately upgrade to MyBlog versions that address this issue, as the original vulnerable versions are no longer supported. The fix should include server-side verification of user credentials before granting administrative access, proper implementation of session management with secure cookie attributes, and validation of privilege levels against legitimate user accounts. Additionally, security measures such as implementing web application firewalls, monitoring for suspicious cookie values, and regular security audits should be deployed to prevent similar issues. This vulnerability highlights the importance of following secure coding practices and implementing defense-in-depth strategies to protect against authentication bypass attacks that can compromise entire web applications.