CVE-2017-3894 in Unified Endpoint Manager
Summary
by MITRE
A stored cross site scripting vulnerability in the Management Console of BlackBerry Unified Endpoint Manager version 12.6.1 and earlier, and all versions of BES12, allows attackers to execute actions in the context of a Management Console administrator by uploading a malicious script and then persuading a target administrator to view the specific location of the malicious script within the Management Console.
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Analysis
by VulDB Data Team • 05/11/2017
The vulnerability described in CVE-2017-3894 represents a critical stored cross site scripting flaw within the BlackBerry Unified Endpoint Management console interface. This security weakness exists in versions 12.6.1 and earlier of the BlackBerry Enterprise Server 12 platform, creating a significant attack surface that adversaries can exploit to gain elevated privileges. The vulnerability specifically targets the management console component, which serves as the primary administrative interface for configuring and managing endpoint devices within the organization's mobile device management ecosystem. The flaw allows attackers to inject malicious scripts that persist within the system, making it particularly dangerous as the malicious code remains active until manually removed from the server.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding within the management console's file upload and display mechanisms. When administrators upload files through the console interface, the system fails to properly sanitize the content, allowing malicious scripts to be stored in the database or file system. The vulnerability is classified as a stored XSS issue under CWE-079, which specifically addresses improper neutralization of input during web page generation in web applications. This weakness enables attackers to execute arbitrary code in the context of the victim administrator's session, potentially allowing full administrative control over the entire endpoint management platform.
The operational impact of this vulnerability extends far beyond simple script execution, as it provides attackers with the capability to escalate privileges and compromise the entire mobile device management infrastructure. An attacker who successfully exploits this vulnerability can perform actions such as creating new administrator accounts, modifying device policies, accessing sensitive data, and potentially exfiltrating information from managed endpoints. The attack vector requires social engineering to convince administrators to view the malicious script within the console, but once executed, the consequences are severe as the attacker gains persistent access to the management interface. This vulnerability directly maps to ATT&CK technique T1059.007 for command and control through scripting, and T1078 for valid accounts and privilege escalation. The attack chain typically involves uploading a malicious file, persuading an administrator to navigate to the file location, and then executing the stored script to gain administrative privileges.
Mitigation strategies for CVE-2017-3894 require immediate patching of the affected BlackBerry Unified Endpoint Management systems to the latest available versions that contain security fixes for this vulnerability. Organizations should implement network segmentation to isolate the management console from general network traffic, reducing the attack surface and limiting potential lateral movement. Input validation and output encoding mechanisms within the console should be strengthened through proper sanitization of all user-supplied data and file uploads. Regular security monitoring and log analysis should be implemented to detect unusual activity patterns that might indicate exploitation attempts. Additionally, administrators should be trained to recognize social engineering attempts and verify the legitimacy of all files before viewing them within the management console interface. The vulnerability demonstrates the critical importance of proper input validation in web applications and highlights the need for comprehensive security testing throughout the software development lifecycle to prevent such persistent security flaws from being introduced into enterprise management platforms.