CVE-2018-6656 in Z-BlogPHP
Summary
by MITRE
Z-BlogPHP 1.5.1 has CSRF via zb_users/plugin/AppCentre/app_del.php, as demonstrated by deleting files and directories.
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Analysis
by VulDB Data Team • 02/03/2023
The vulnerability identified as CVE-2018-6656 affects Z-BlogPHP version 1.5.1 and represents a critical cross-site request forgery flaw that enables unauthorized file deletion operations through the application's plugin management interface. This vulnerability exists within the zb_users/plugin/AppCentre/app_del.php endpoint, which processes file deletion requests without proper authentication verification or anti-CSRF token validation. The flaw allows malicious actors to construct specially crafted web pages or email attachments that, when visited by an authenticated user, automatically submit deletion requests to the vulnerable application. The attack vector leverages the trust relationship between the web application and the user's browser, exploiting the fact that the application does not verify the authenticity of requests originating from the user's session.
The technical implementation of this vulnerability stems from inadequate input validation and session management within the Z-BlogPHP application framework. When a user accesses the AppCentre plugin interface, the application should validate that deletion requests originate from legitimate administrative actions within the user's authenticated session. However, the app_del.php script fails to implement proper CSRF protection mechanisms such as anti-CSRF tokens, referer header validation, or origin checking. This absence of validation allows attackers to forge requests that appear to come from legitimate administrative users, enabling them to delete critical application files, directories, and potentially compromise the entire blogging platform. The vulnerability falls under CWE-352, which specifically addresses Cross-Site Request Forgery weaknesses in software applications.
The operational impact of this vulnerability extends beyond simple file deletion, as it can lead to complete system compromise and data loss. An attacker who successfully exploits this CSRF vulnerability can remove core application files, plugin components, or even the entire application directory structure, effectively rendering the blog inaccessible and potentially causing permanent data loss. The consequences are particularly severe for websites that rely on Z-BlogPHP for content management, as the deletion of critical system files can result in complete service disruption. Additionally, this vulnerability can serve as a stepping stone for more sophisticated attacks, where the attacker might first delete security-related files before attempting to upload malicious content or establish persistent access. The attack can be executed through various vectors including phishing emails, compromised websites, or social engineering campaigns that trick users into visiting malicious pages while authenticated to the vulnerable application.
Organizations using Z-BlogPHP 1.5.1 should implement immediate mitigations to protect against this vulnerability, including the deployment of anti-CSRF tokens throughout all administrative interfaces and the implementation of proper session management controls. The recommended solution involves updating to a patched version of Z-BlogPHP that includes CSRF protection mechanisms and proper input validation. Security measures should also include monitoring for unauthorized file deletion activities and implementing web application firewalls that can detect and block suspicious request patterns. From an ATT&CK framework perspective, this vulnerability maps to T1078 Valid Accounts and T1059 Command and Scripting Interpreter, as attackers can leverage authenticated sessions to execute destructive operations. The mitigation strategy should also involve regular security assessments of web applications and proper security training for administrators to recognize potential social engineering attacks that could exploit this vulnerability. Organizations should also consider implementing least privilege access controls and regular backup procedures to minimize the impact of potential exploitation attempts.