CVE-2020-23370 : What You Need to Know
Learn about CVE-2020-23370 affecting YzmCMS 5.6, allowing remote attackers to upload malicious swf files for executing arbitrary web scripts or HTML. Find mitigation steps and preventive measures.
YzmCMS 5.6 is affected by a stored XSS vulnerability that allows remote attackers to upload a malicious swf file.
Understanding CVE-2020-23370
In YzmCMS 5.6, a specific action parameter in a PHP file enables the exploitation of a stored XSS vulnerability, potentially leading to the injection of arbitrary web scripts or HTML by malicious actors.
What is CVE-2020-23370?
The vulnerability in YzmCMS 5.6 allows attackers to upload a swf file that can be manipulated to execute arbitrary web scripts or HTML code.
The Impact of CVE-2020-23370
This vulnerability can be exploited by remote attackers to inject malicious content into the application, potentially leading to various attacks such as cross-site scripting (XSS).
Technical Details of CVE-2020-23370
YzmCMS 5.6 is susceptible to a stored XSS vulnerability due to improper validation of user-supplied data.
Vulnerability Description
The flaw resides in the common/static/plugin/ueditor/1.4.3.3/php/controller.php action parameter, allowing attackers to upload a swf file containing malicious scripts.
Affected Systems and Versions
- Product: YzmCMS 5.6
- Vendor: N/A
- Version: N/A
Exploitation Mechanism
Attackers can exploit this vulnerability by uploading a specially crafted swf file through the mentioned action parameter, enabling the injection of malicious web scripts or HTML.
Mitigation and Prevention
It is crucial to take immediate steps to mitigate the risks posed by CVE-2020-23370.
Immediate Steps to Take
- Disable file uploads in the affected parameter to prevent the upload of malicious swf files.
- Implement input validation and sanitization to filter out potentially harmful content.
Long-Term Security Practices
- Regularly update and patch the YzmCMS installation to address security vulnerabilities.
- Conduct security audits and penetration testing to identify and remediate potential weaknesses.
Patching and Updates
- Apply patches or updates provided by the YzmCMS vendor to fix the vulnerability and enhance the overall security posture of the system.