CVE-2017-16603 in Enterprise Manager
Summary
by MITRE
This vulnerability allows remote attackers to execute code by creating arbitrary files on vulnerable installations of NetGain Systems Enterprise Manager 7.2.730 build 1034. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the org.apache.jsp.u.jsp.settings.upload_005ffile_005fdo_jsp servlet, which listens on TCP port 8081 by default. When parsing the filename parameter, the process does not properly validate user-supplied data, which can allow for the upload of files. An attacker can leverage this vulnerability to execute code under the context of Administrator. Was ZDI-CAN-5194.
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Analysis
by VulDB Data Team • 12/26/2019
This vulnerability represents a critical remote code execution flaw in NetGain Systems Enterprise Manager version 7.2.730 build 1034 that demonstrates poor input validation and authentication bypass capabilities. The vulnerability exists within the org.apache.jsp.u.jsp.settings.upload_005ffile_005fdo_jsp servlet component which operates on the default TCP port 8081, making it accessible to remote attackers who can leverage this service for exploitation. The core technical weakness lies in the improper validation of the filename parameter during file upload processing, which creates a path traversal and arbitrary file upload condition that allows malicious actors to execute code with administrative privileges.
The vulnerability architecture follows a classic authentication bypass followed by privilege escalation pattern that aligns with CWE-287 (Improper Authentication) and CWE-73 (External Control of File Name or Path) categories. Attackers can circumvent existing authentication mechanisms to gain access to the file upload functionality, then exploit the insecure parameter handling to place malicious files in the target system's file system. This flaw is particularly dangerous because it operates under the assumption that legitimate authentication exists but can be bypassed, allowing an attacker to upload files that will be executed with the highest privileges available on the system. The default listening port of 8081 provides an easily discoverable attack surface that follows common service enumeration patterns seen in enterprise network reconnaissance activities.
The operational impact of this vulnerability is severe as it provides complete system compromise capabilities when exploited successfully. An attacker who can bypass authentication and upload malicious files gains administrative privileges on the target system, enabling them to access all system resources, modify configurations, steal sensitive data, and potentially establish persistent access. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1078 (Valid Accounts) for authentication bypass and T1059 (Command and Scripting Interpreter) for code execution. The default configuration of the vulnerable service creates an attack surface that requires minimal reconnaissance to identify and exploit, making it particularly attractive to threat actors. The administrative execution context provides access to all system functions and data, effectively granting full control over the compromised system and potentially enabling lateral movement within the network.
Mitigation strategies for this vulnerability should focus on multiple defensive layers including immediate patching of the affected NetGain Systems Enterprise Manager version, network segmentation to restrict access to the default port 8081, and implementation of strict access controls for the upload functionality. Organizations should disable unnecessary services, implement proper input validation and sanitization for all user-supplied parameters, and enforce strong authentication mechanisms with multi-factor authentication where possible. Network monitoring should be enhanced to detect unusual file upload patterns and unauthorized access attempts to the vulnerable servlet endpoint. The vulnerability also highlights the importance of proper security configuration management and regular vulnerability assessments to identify and remediate similar issues in enterprise applications, particularly those with default installations that may be exposed to external networks without proper firewall rules or access controls.