CVE-2018-7700 in DeDeCMS
Summary
by MITRE
DedeCMS 5.7 has CSRF with an impact of arbitrary code execution, because the partcode parameter in a tag_test_action.php request can specify a runphp field in conjunction with PHP code.
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Analysis
by VulDB Data Team • 01/17/2020
DedeCMS 5.7 contains a critical cross-site request forgery vulnerability that can be exploited to achieve arbitrary code execution through a carefully crafted malicious request. This vulnerability exists in the tag_test_action.php script where the partcode parameter accepts user input without proper validation or sanitization. The flaw allows an attacker to inject PHP code directly into the runphp field, which then gets executed by the vulnerable system. This represents a severe security weakness that can be leveraged for complete system compromise.
The technical implementation of this vulnerability stems from improper input handling within the content management system's template processing functionality. When the partcode parameter is submitted to tag_test_action.php, the system fails to validate or sanitize the input before processing it as part of a PHP execution context. This creates an environment where malicious payloads can be embedded directly within the runphp field, allowing attackers to execute arbitrary PHP commands on the server. The vulnerability specifically affects the template tag processing engine, which is designed to allow dynamic content generation but lacks proper security controls.
From an operational perspective, this vulnerability presents a significant risk to organizations using DedeCMS 5.7 as it enables attackers to execute code remotely without authentication. The impact extends beyond simple data theft to include complete system compromise, including the ability to install backdoors, modify content, access sensitive files, and potentially use the compromised system as a pivot point for attacking other systems within the network. The vulnerability is particularly dangerous because it can be exploited through social engineering techniques where users are tricked into visiting malicious websites or clicking on compromised links. This makes it an attractive target for attackers seeking to gain persistent access to web applications.
The vulnerability aligns with CWE-352 Cross-Site Request Forgery and follows patterns consistent with ATT&CK technique T1059.006 Command and Scripting Interpreter PHP. Organizations should implement immediate mitigations including input validation, output encoding, and the implementation of anti-CSRF tokens throughout the application. Additionally, regular security updates and patches should be applied promptly to address known vulnerabilities. The system should also enforce proper access controls and audit logging to detect suspicious activities. Network segmentation and web application firewalls can provide additional layers of protection while more comprehensive security measures such as code review processes and security testing should be implemented to prevent similar vulnerabilities in the future.