Executive Summary

This vulnerability is a flaw in the Upload function of the file application/lib/file/LocalUploader.php in ChenJinchuang Lin-CMS-TP5 up to version 0.3.3. It allows an attacker to manipulate the File argument to inject code remotely, potentially executing malicious code on the server.

Useful 0 Not Useful 0

Impact Analysis

The vulnerability can lead to remote code injection, which may allow an attacker to execute arbitrary code on the affected system. This can compromise the integrity, confidentiality, and availability of the system and its data.

Useful 0 Not Useful 0

Compliance Impact

The provided resources do not explicitly discuss the impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA. However, since the vulnerability allows remote code execution, persistent backdoors, and information leakage, it could potentially lead to unauthorized access or disclosure of sensitive data, which may violate data protection regulations. No direct statements about compliance impact are available in the provided texts. [1, 2, 3]

Useful 0 Not Useful 0

Detection Guidance

This vulnerability can be detected by checking if the vulnerable endpoint POST /cms/file is accessible and allows uploading files without proper validation. You can attempt to upload a test file with a script extension (e.g., test.php) to the /cms/file endpoint and then verify if the file is saved in the public/uploads directory and can be accessed/executed via a URL. For example, you can use curl to send a crafted multipart/form-data POST request to upload a PHP file: curl -X POST -F "[email protected]" http://target/cms/file Then check if the file is accessible via a URL like http://target/uploads/<date>/<filename>.php. Additionally, you can search your system for uploaded files with executable extensions in the public/uploads directory. Also, attackers may use Google dorking with queries like inurl:application/lib/file/LocalUploader.php to identify vulnerable targets. [1, 2]

Useful 0 Not Useful 0

Mitigation Strategies

Immediate mitigation steps include restricting or disabling the file upload functionality at the /cms/file endpoint if possible. Implement strict validation and filtering of uploaded files to allow only safe file types and sanitize filenames. Restrict execution permissions on the public/uploads directory to prevent execution of uploaded scripts. If no patch or fix is available, consider replacing the affected product with an alternative CMS. Monitoring and blocking suspicious upload attempts can also help reduce risk. [1, 2, 3]

Useful 0 Not Useful 0