CVE-2006-3479 in Nuked-Klan
Summary
by MITRE
Cross-site request forgery (CSRF) vulnerability in the del_block function in modules/Admin/block.php in Nuked-Klan 1.7.5 and earlier and 1.7 SP4.2 allows remote attackers to delete arbitrary "blocks" via a link with a modified bid parameter in a del_block op on the block page in index.php.
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Analysis
by VulDB Data Team • 07/31/2018
The vulnerability identified as CVE-2006-3479 represents a critical cross-site request forgery flaw within the Nuked-Klan content management system version 1.7.5 and earlier releases including the 1.7 SP4.2 patch. This vulnerability specifically targets the del_block function located in the modules/Admin/block.php file, exposing the system to unauthorized administrative actions that can be executed remotely without proper authentication. The flaw manifests when users navigate to the block management page in index.php and encounter a maliciously crafted link that modifies the bid parameter, enabling attackers to delete arbitrary blocks from the system. This represents a fundamental failure in the application's session management and request validation mechanisms, as the system fails to verify the authenticity of requests originating from legitimate administrative users.
The technical exploitation of this CSRF vulnerability relies on the absence of proper anti-CSRF tokens or similar validation mechanisms within the block deletion functionality. When an administrator visits the block management interface, the application processes deletion requests based solely on the bid parameter without confirming that the request originates from an authenticated and authorized user session. This design flaw allows malicious actors to construct deceptive links that, when clicked by an authenticated administrator, execute the block deletion operation with the attacker's specified parameters. The vulnerability directly maps to CWE-352, which categorizes cross-site request forgery vulnerabilities as those that permit unauthorized commands to be executed on behalf of authenticated users. The attack vector leverages the trust relationship between the web application and the user's browser, exploiting the fact that browsers automatically include authentication cookies with requests to the target domain.
The operational impact of this vulnerability extends beyond simple data deletion, as it compromises the integrity and availability of the content management system's administrative interface. Attackers can systematically remove critical blocks such as navigation menus, important announcements, or security-related modules, potentially disrupting the entire website functionality. This type of attack represents a significant threat to website administrators who may unknowingly click on malicious links in compromised forums, email messages, or other web locations. The vulnerability also enables attackers to create a persistent threat by deleting security blocks or administrative interfaces, thereby reducing the system's ability to defend against further attacks. From an ATT&CK framework perspective, this vulnerability aligns with the technique T1078 - Valid Accounts, as it allows attackers to leverage authenticated administrative sessions for unauthorized actions, and T1566 - Phishing, as the attack typically requires social engineering to get administrators to click malicious links.
Mitigation strategies for this vulnerability require immediate implementation of proper anti-CSRF token mechanisms throughout the Nuked-Klan administrative functions. The system must generate unique, unpredictable tokens for each user session and validate these tokens with every administrative request, including block deletion operations. Additionally, implementing proper request origin validation and requiring explicit user confirmation for destructive operations would significantly reduce the risk of unauthorized block deletions. Administrators should also consider implementing role-based access controls and monitoring for unusual administrative activities. The most effective long-term solution involves upgrading to a patched version of Nuked-Klan that incorporates proper CSRF protection mechanisms. Organizations should also implement web application firewalls that can detect and block suspicious parameter modifications, while conducting regular security audits to identify similar vulnerabilities in other administrative functions. This vulnerability underscores the critical importance of implementing comprehensive security measures in web applications, particularly in administrative interfaces where unauthorized access can result in significant system compromise and data loss.