CVE-2022-23880 in taocms
Summary
by MITRE • 03/24/2022
An arbitrary file upload vulnerability in the File Management function module of taoCMS v3.0.2 allows attackers to execute arbitrary code via a crafted PHP file.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 03/25/2022
The CVE-2022-23880 vulnerability represents a critical arbitrary file upload flaw within the taoCMS v3.0.2 content management system that exposes organizations to remote code execution risks. This vulnerability resides in the File Management function module, which serves as a core component for handling file operations within the CMS framework. The flaw stems from insufficient input validation and sanitization mechanisms that fail to properly verify file types and content before allowing uploads to the server. Attackers can exploit this weakness by crafting malicious PHP files with carefully constructed payloads that bypass the intended security controls. The vulnerability is particularly dangerous because it directly enables attackers to upload executable code that can be executed within the context of the web server, potentially leading to complete system compromise.
From a technical perspective, the vulnerability manifests as a failure in the file upload validation process where the application does not adequately filter or restrict file extensions, content types, or file attributes. This weakness aligns with CWE-434 which describes insecure file upload vulnerabilities where applications accept files without proper validation, allowing malicious files to be uploaded and executed. The flaw operates at the application layer, specifically targeting the file handling functionality that should enforce strict security policies to prevent unauthorized code execution. When a malicious PHP file is uploaded, it can be executed by the web server, providing attackers with a persistent backdoor into the system. The vulnerability's exploitation pathway involves uploading a PHP shell or web shell that can be accessed through the web interface, enabling attackers to execute arbitrary commands on the compromised server.
The operational impact of CVE-2022-23880 extends far beyond simple data theft, as it provides attackers with complete control over the affected system. Once exploited, the vulnerability allows for privilege escalation, data exfiltration, and the establishment of persistent access points within the network. Organizations running taoCMS v3.0.2 become vulnerable to various attack vectors including but not limited to web shell deployment, lateral movement, and data manipulation. The vulnerability's presence in the File Management module means that attackers can upload files at multiple points within the application, potentially bypassing traditional security controls. This flaw significantly increases the attack surface and can be leveraged to establish a foothold for more sophisticated attacks, including those that follow the ATT&CK framework's persistence and privilege escalation tactics. The vulnerability's severity is compounded by the fact that it allows for immediate code execution without requiring additional authentication or complex exploitation techniques.
Mitigation strategies for CVE-2022-23880 must address both immediate remediation and long-term security hardening measures. Organizations should prioritize updating to the latest version of taoCMS where the vulnerability has been patched, as this represents the most effective immediate solution. Additionally, implementing strict file upload validation mechanisms including MIME type checking, file extension filtering, and content analysis should be enforced. Security controls should include disabling PHP execution in upload directories, implementing proper file permissions, and conducting regular security audits of file handling processes. Network-level protections such as web application firewalls and intrusion detection systems can provide additional layers of defense. Organizations should also consider implementing the principle of least privilege for file upload functionality, ensuring that only authorized users can perform file operations. Regular security testing including penetration testing and vulnerability scanning should be conducted to identify similar weaknesses in other application components and to validate that the implemented mitigations remain effective against evolving attack techniques.