Citrix XenMobile Server Remote Code Execution Scanner

Citrix XenMobile Server is a comprehensive solution used by enterprises for mobility management. It is widely employed to manage and secure mobile devices, apps, and data, providing IT administrators control over mobile assets. Organizations use it to ensure the security and efficiency of their mobile operations, facilitating functionalities like mobile device management (MDM) and mobile application management (MAM). Its robust architecture supports deployment across various platforms, including iOS, Android, and Windows phones. Enterprises rely on XenMobile Server for critical operations, making its security paramount. By ensuring seamless integration and management, it becomes an integral component of enterprise mobility strategies.

The vulnerability in question is a Remote Code Execution (RCE) flaw residing within the Apache Log4j component of XenMobile Server. It poses a serious threat as it allows attackers to execute arbitrary code on the server. The flaw is due to improper handling of JNDI in configuration and log messages, especially when LDAP paths are manipulated. Attackers can inject malicious payloads into log messages, facilitating code execution if the server is not properly patched. This RCE vulnerability, notably associated with CVE-2021-44228, has been categorized as critical given its potential impact. It highlights significant weaknesses in handling and validating user-supplied data.

Technical details of the vulnerability reveal critical endpoints like /zdm/cxf/login, which are exploited using specially crafted HTTP POST requests. Attackers use JNDI LDAP endpoints to introduce malicious code, bypassing traditional security logs. The flaw predominantly lies in the server's inability to sanitize inputs leading to malicious message substitution. Vulnerable parameters include those employed in login functionalities that inadvertently trigger erroneous log message processing. When combined with interactsh tools, attackers can discern vulnerable paths through DNS interaction. This showcases how systemic vulnerabilities in library configurations could lead to severe breaches.

If exploited, this vulnerability can lead to severe consequences including unauthorized access, data breach, and complete server compromise. Attackers gaining RCE capabilities may manipulate server functions, leading to information theft or destruction. It elevates the risk of sensitive data exposure and loss of control over server operations. The compromised server could also become a pivot point for broader network attacks. Organizations may face severe downtime while they mitigate such attacks, leading to operational and financial damages. The broader implications underline the necessity for immediate patching and employing enhanced security practices.

REFERENCES

• https://support.citrix.com/article/CTX335705/citrix-security-advisory-for-cve202144228-cve202145046-cve202145105-and-cve202144832