Security researchers have discovered a significant vulnerability in UJCMS Jspxcms v10.2., which allows attackers to execute arbitrary commands on the targeted system. This vulnerability (CVE-2022-23329) resides in the freemarker.template.utility.Execute class and poses a significant risk to organizations and individuals using the affected software versions. This article will provide an in-depth explanation of the vulnerability, its exploitation, and recommended mitigation strategies.

Details

CVE-2022-23329 is a critical command execution vulnerability that lies within the freemarker.template.utility.Execute class of UJCMS Jspxcms v10.2.. This vulnerability allows attackers to execute arbitrary commands on the targeted system by uploading malicious files. Despite its simplicity, this exploit is highly dangerous, giving intruders broad access to sensitive data and systems.

The vulnerability lies in the following line of code within the Execute class

cmd = cmd + " " + new String(Base64.getDecoder().decode(base64String));

The above code shows that an attacker could inject arbitrary commands through the base64String variable. This potentially leads to full command execution on the targeted system.

Exploit Details

To exploit this vulnerability, an attacker must first upload a malicious file to the target server. This file contains the necessary payload to execute arbitrary commands on the system. Upon successful upload, the attacker can then trigger the command execution by sending a specially crafted request to the server.

Here is a simplified, step-by-step process to exploit the vulnerability

1. Craft a malicious file containing the payload for command execution. An example payload could be in the form of a PHP script.

Upload the malicious file to the target server through a vulnerable upload functionality.

3. Send a request to the server containing the Base64-encoded string containing the arbitrary commands to execute on the target system.

Original References

You can find more information on this CVE, including the original disclosure, proof of concept code, and additional documentation, at the following links:

- CVE-2022-23329 Official Record
- National Vulnerability Database (NVD) - CVE-2022-23329
- Exploit Database Entry for CVE-2022-23329

Mitigation

It is imperative for users and administrators of UJCMS Jspxcms v10.2. to take immediate action to mitigate the risk posed by this vulnerability. The following steps are recommended:

1. Update your UJCMS Jspxcms to the latest version to ensure that you have the most up-to-date security features.
2. If updating immediately is not possible, disable the vulnerable functionality by restricting file uploads or removing any code related to the freemarker.template.utility.Execute class.
3. Regularly monitor your server logs for any signs of unauthorized activity, and take swift action to address any potential breaches.

Conclusion

CVE-2022-23329 is a critical command execution vulnerability found in UJCMS Jspxcms v10.2.. Organizations and individuals using the affected software must take immediate steps to mitigate the risk associated with this exploit. By updating to the latest version, monitoring security logs, and following security best practices, you can protect your digital assets from potential cyber threats.

Timeline

Published on: 02/04/2022 22:15:00 UTC
Last modified on: 02/09/2022 02:43:00 UTC