CVE-2012-5231 in miniCMS
Summary
by MITRE
miniCMS 1.0 and 2.0 allows remote attackers to execute arbitrary PHP code via a crafted (1) pagename or (2) area variable containing an executable extension, which is not properly handled by (a) update.php when writing files to content/, or (b) updatenews.php when writing files to content/news/.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 01/26/2025
The vulnerability identified as CVE-2012-5231 represents a critical remote code execution flaw in miniCMS versions 1.0 and 2.0 that stems from inadequate input validation and improper file handling mechanisms. This security weakness specifically targets the content management system's update processes, creating a pathway for attackers to inject and execute malicious PHP code on the affected server. The vulnerability manifests through two distinct attack vectors involving crafted pagename or area variables that contain executable extensions, exploiting the system's failure to properly sanitize user-supplied input before processing file operations.
The technical implementation of this vulnerability occurs within the update.php and updatenews.php scripts which are responsible for writing files to the content/ and content/news/ directories respectively. When these scripts receive user-controllable input containing executable extensions such as .php, .phtml, or other script extensions, they fail to properly validate or sanitize the input before writing the malicious code to the filesystem. This improper handling creates a classic path traversal and code execution scenario where attacker-controlled content can be written to web-accessible directories, allowing immediate execution of malicious payloads. The flaw directly maps to CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and specifically addresses the issue of insufficient input validation in file handling operations.
The operational impact of this vulnerability is severe and far-reaching, as it provides remote attackers with complete control over the affected web server running miniCMS. Successful exploitation enables attackers to execute arbitrary commands with the privileges of the web server process, potentially leading to full system compromise, data theft, or server redirection. The vulnerability affects not only the immediate web application but can also serve as a foothold for further attacks within the network infrastructure, as attackers can use the compromised server to pivot to other systems. Additionally, the vulnerability's persistence through file system modifications means that even after the initial attack, the malicious code remains active until manually removed by administrators.
Organizations affected by this vulnerability should implement immediate mitigations including input validation and sanitization of all user-supplied parameters, particularly those used in file handling operations. The recommended approach involves implementing strict file extension validation that rejects any input containing executable extensions, while also ensuring that file operations are performed with proper access controls and sandboxing measures. Security professionals should also consider implementing web application firewalls to detect and block suspicious file upload patterns, and conduct comprehensive code reviews to identify similar vulnerabilities in other file handling components. The ATT&CK framework categorizes this vulnerability under T1059.007 for "Command and Scripting Interpreter: PHP" and T1566.001 for "Phishing: Spearphishing Attachment", highlighting the attack vectors and techniques that exploit such code injection vulnerabilities in web applications.