CVE-2018-20062 in NoneCms
Summary
by MITRE
An issue was discovered in NoneCms V1.3. thinkphp/library/think/App.php allows remote attackers to execute arbitrary PHP code via crafted use of the filter parameter, as demonstrated by the s=index/\think\Request/input&filter=phpinfo&data=1 query string.
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Analysis
by VulDB Data Team • 02/05/2025
The vulnerability identified as CVE-2018-20062 affects NoneCms V1.3 and represents a critical remote code execution flaw within the ThinkPHP framework component. This vulnerability exists in the thinkphp/library/think/App.php file where improper input validation allows attackers to manipulate the filter parameter, creating a pathway for arbitrary PHP code execution. The flaw specifically manifests when the application processes user-supplied input through the Request class without adequate sanitization, enabling malicious actors to inject and execute PHP commands directly on the target server.
The technical exploitation of this vulnerability follows a well-defined pattern that leverages the framework's input processing mechanisms. Attackers can craft malicious URLs containing the filter parameter with values such as phpinfo or other PHP functions that would normally be restricted. When the application processes these inputs through the input method in the Request class, the inadequate filtering allows the malicious code to execute within the context of the web server process. This represents a classic case of improper input validation and sanitization, which aligns with CWE-20 - Improper Input Validation and CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component.
The operational impact of this vulnerability is severe and multifaceted, as it provides remote attackers with complete control over the affected server. Successful exploitation allows attackers to execute arbitrary commands, potentially leading to data theft, system compromise, and further lateral movement within the network. The vulnerability affects the entire application stack since it operates at the framework level, meaning that any application built on this version of ThinkPHP could be compromised. The attack vector is particularly concerning as it requires no authentication and can be executed through simple HTTP requests, making it highly accessible to threat actors.
Security mitigations for this vulnerability must address both immediate remediation and long-term architectural improvements. Organizations should immediately upgrade to patched versions of NoneCms and ThinkPHP framework components to eliminate the vulnerable code paths. Additionally, implementing proper input validation and sanitization measures within the application code can help prevent similar issues in the future. The implementation of web application firewalls and runtime application self-protection mechanisms can provide additional layers of defense. From an ATT&CK framework perspective, this vulnerability maps to T1059.001 - Command and Scripting Interpreter: PHP and T1059.007 - Command and Scripting Interpreter: Python, highlighting the need for defensive measures against code execution attacks. Regular security assessments and code reviews focusing on input handling and sanitization practices should become standard procedures to prevent similar vulnerabilities from emerging in the future.