CVE-2020-22153 in Fuel
Summary
by MITRE • 07/04/2023
File Upload vulnerability in FUEL-CMS v.1.4.6 allows a remote attacker to execute arbitrary code via a crafted .php file to the upload parameter in the navigation function.
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Analysis
by VulDB Data Team • 07/22/2023
The vulnerability CVE-2020-22153 represents a critical file upload flaw in FUEL-CMS version 1.4.6 that exposes systems to remote code execution attacks. This issue resides within the navigation function's upload parameter handling, creating an avenue for malicious actors to bypass security controls and deploy malicious payloads. The vulnerability stems from insufficient input validation and sanitization mechanisms that fail to properly restrict file type uploads, particularly allowing php files to be executed within the web application's context.
This vulnerability maps directly to CWE-434, which describes insecure file upload vulnerabilities where applications fail to properly validate file types and content. The flaw enables attackers to upload malicious php files that can be executed on the server, potentially leading to complete system compromise. The attack vector requires minimal privileges as the vulnerability exists in a publicly accessible function, making it particularly dangerous for web applications that do not properly implement file upload restrictions. The navigation function typically handles user interface elements and content management, making it a high-value target for attackers seeking persistent access to the CMS.
The operational impact of this vulnerability extends beyond simple code execution to encompass full system compromise and data breach potential. Attackers can leverage this flaw to establish persistent backdoors, exfiltrate sensitive data, or use the compromised system as a launch point for further attacks within the network. The vulnerability affects organizations using FUEL-CMS v.1.4.6, which may include content management systems for websites, web applications, and enterprise portals. According to ATT&CK framework, this vulnerability corresponds to T1059.007 for command and scripting interpreter and T1078 for valid accounts, as attackers can execute commands through uploaded files and potentially gain elevated privileges. The exploitation process typically involves uploading a php shell or web shell that can be accessed through the web server, enabling attackers to execute arbitrary commands on the target system.
Mitigation strategies should focus on immediate patching of the FUEL-CMS to version 1.4.7 or later, which addresses this vulnerability through proper file type validation and sanitization. Organizations should implement robust file upload restrictions including MIME type validation, file extension filtering, and content-based checks to prevent php file uploads. Additional security measures include implementing proper access controls, restricting upload directories, and using secure file handling practices such as storing uploaded files outside the web root. Network segmentation and monitoring solutions should be deployed to detect suspicious file upload activities and unauthorized access attempts. The vulnerability also highlights the importance of regular security assessments, dependency updates, and adherence to secure coding practices as outlined in OWASP Top 10 and NIST cybersecurity frameworks to prevent similar issues in the future.