CVE-2017-16920 : What You Need to Know
Learn about CVE-2017-16920 affecting Dayrui FineCms 5.2.0. Understand the impact, exploitation method, and mitigation steps for this remote code execution vulnerability.
Dayrui FineCms version 5.2.0 is vulnerable to remote code execution due to a default SYS_KEY value in the system.php file, allowing attackers to upload malicious PHP files.
Understanding CVE-2017-16920
What is CVE-2017-16920?
The vulnerability in Dayrui FineCms 5.2.0 enables remote attackers to exploit a preset SYS_KEY value, facilitating the upload of harmful .php files through the member API swfupload action.
The Impact of CVE-2017-16920
This vulnerability can lead to unauthorized remote code execution, potentially compromising the integrity and security of the affected system.
Technical Details of CVE-2017-16920
Vulnerability Description
The issue arises from the default SYS_KEY value in v5/config/system.php, eliminating the need for key regeneration during installation, which malicious actors can abuse.
Affected Systems and Versions
- Product: Dayrui FineCms
- Version: 5.2.0
Exploitation Mechanism
Attackers can leverage the member API swfupload action in index.php to upload malicious .php files, exploiting the preset SYS_KEY value.
Mitigation and Prevention
Immediate Steps to Take
- Disable member API swfupload action if not essential
- Implement strict file upload validation and filtering mechanisms
- Monitor system logs for any suspicious activities
Long-Term Security Practices
- Regularly update and patch the CMS and its components
- Conduct security audits and penetration testing to identify vulnerabilities
Patching and Updates
Apply the latest security patches and updates provided by Dayrui FineCms to address this vulnerability.