^{CVE-2021-44520:}Authenticated Command Injection vulnerability in Citrix XenMobile Server allows remote code execution with root privileges.

Overview

This vulnerability exists in Citrix XenMobile Server (also known as Citrix Endpoint Management), a mobile device management solution that helps organizations manage employee devices. The command injection vulnerability allows authenticated users to execute arbitrary commands on the underlying operating system with root-level privileges. This means that attackers who have valid credentials to the XenMobile management interface can exploit this vulnerability to take full control of the server, potentially accessing sensitive data, modifying system configurations, establishing persistence, or using the compromised server as a pivot point to attack other systems in the network. The vulnerability affects all versions of Citrix XenMobile Server through 10.12 RP9.

Remediation

Organizations using affected versions of Citrix XenMobile Server should take the following steps:

1. Update to the latest version of Citrix XenMobile Server (Citrix Endpoint Management) that contains the fix for this vulnerability.
2. If immediate patching is not possible, implement network segmentation to limit access to the XenMobile management interface.
3. Enforce strong authentication mechanisms and review user accounts with administrative access to the XenMobile Server.
4. Monitor system logs for suspicious activities that might indicate exploitation attempts.
5. Implement the principle of least privilege for all accounts that have access to the management interface.
6. Consider implementing additional security controls such as web application firewalls to help mitigate potential exploitation attempts.

References

1. Citrix Documentation History: https://docs.citrix.com/en-us/xenmobile/server/document-history.html
2. Citrix Security Advisory: https://support.citrix.com/article/CTX370551
3. Technical Analysis by CHT Security: https://gist.github.com/tree-chtsec/766f81e22ae383987d75eedb3b23b709
4. CHT Security News: https://www.chtsecurity.com/news/09be10ae-b50e-46c9-8ce7-2e995fd988fe