CVE-2017-20237: Hirschmann HiVision Auth Bypass Flaw

CVE-2017-20237 Overview

CVE-2017-20237 is a critical authentication bypass vulnerability affecting Hirschmann Industrial HiVision, a network management software used in industrial control system (ICS) environments. The vulnerability exists in the master service component and allows unauthenticated remote attackers to execute arbitrary commands with administrative privileges. Attackers can invoke exposed interface methods over the remote service to bypass authentication mechanisms entirely, achieving remote code execution on the underlying operating system.

Critical Impact

Unauthenticated remote attackers can execute arbitrary commands with administrative privileges on affected Hirschmann Industrial HiVision systems, potentially compromising entire industrial network infrastructure.

Affected Products

• Hirschmann Industrial HiVision versions prior to 06.0.07
• Hirschmann Industrial HiVision versions prior to 07.0.03

Discovery Timeline

• 2026-04-03 - CVE-2017-20237 published to NVD
• 2026-04-07 - Last updated in NVD database

Technical Details for CVE-2017-20237

Vulnerability Analysis

This vulnerability is classified as CWE-287 (Improper Authentication) and represents a fundamental flaw in how Hirschmann Industrial HiVision's master service handles authentication for remote requests. The vulnerability allows attackers to completely bypass authentication controls, meaning no credentials are required to interact with the affected service.

The impact of successful exploitation is severe due to the industrial control system context. Hirschmann Industrial HiVision is commonly deployed to manage critical network infrastructure in manufacturing, utilities, and other industrial environments. Gaining administrative command execution on such systems could allow attackers to disrupt industrial processes, pivot to other connected systems, or establish persistent access within operational technology (OT) networks.

Root Cause

The root cause of CVE-2017-20237 lies in improper authentication implementation within the master service component. The service exposes interface methods that can be invoked remotely without proper verification of the caller's identity or authorization level. This design flaw allows any network-accessible attacker to interact with privileged functionality that should require authentication.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no user interaction or prior authentication. An attacker with network access to the vulnerable Hirschmann Industrial HiVision service can invoke exposed interface methods remotely. By sending crafted requests to the master service, the attacker can bypass authentication mechanisms and execute arbitrary commands with the same privileges as the HiVision application—typically administrative or system-level access.

The exploitation process involves:

1. Identifying a network-accessible Hirschmann Industrial HiVision installation running a vulnerable version
2. Connecting to the master service endpoint
3. Invoking exposed interface methods that lack proper authentication checks
4. Executing arbitrary system commands with administrative privileges

Due to the sensitive nature of this vulnerability affecting industrial control systems, specific exploitation details are not provided. Technical details can be found in the Belden Security Bulletin and VulnCheck Advisory.

Detection Methods for CVE-2017-20237

Indicators of Compromise

• Unexpected or unauthorized connections to Hirschmann Industrial HiVision master service ports from external or unusual IP addresses
• Anomalous process execution or command-line activity originating from the HiVision application process
• Unauthorized administrative actions logged within HiVision without corresponding authenticated user sessions
• New or modified user accounts, scheduled tasks, or services created on systems running HiVision

Detection Strategies

• Monitor network traffic to and from Hirschmann Industrial HiVision servers for suspicious patterns, particularly unauthenticated requests to the master service
• Implement endpoint detection and response (EDR) solutions to identify anomalous command execution from HiVision processes
• Deploy network intrusion detection systems (IDS) with rules to detect exploitation attempts targeting the HiVision master service
• Conduct regular vulnerability assessments to identify unpatched HiVision installations within your environment

Monitoring Recommendations

• Enable comprehensive logging on Hirschmann Industrial HiVision servers and forward logs to a SIEM for correlation and analysis
• Establish network segmentation and monitor cross-segment traffic involving industrial control system management interfaces
• Implement behavioral analytics to detect deviations from normal HiVision operational patterns
• Regularly audit authentication logs and compare against expected administrative access patterns

How to Mitigate CVE-2017-20237

Immediate Actions Required

• Upgrade Hirschmann Industrial HiVision to version 06.0.07 or later (for 6.x branch) or version 07.0.03 or later (for 7.x branch)
• Isolate vulnerable HiVision installations from untrusted networks until patching is complete
• Implement strict network access controls to limit connectivity to HiVision services to authorized management workstations only
• Review system logs for any indicators of prior exploitation before and after applying patches

Patch Information

Belden (parent company of Hirschmann) has released security updates to address this vulnerability. Organizations should upgrade to Hirschmann Industrial HiVision version 06.0.07 or later for the 6.x release branch, or version 07.0.03 or later for the 7.x release branch. Detailed patch information is available in the Belden Security Bulletin BSECV-2017-02.

Workarounds

• Implement network segmentation to prevent direct network access to HiVision master service from untrusted networks
• Deploy firewall rules to restrict access to HiVision services to specific authorized IP addresses or network ranges
• Place HiVision servers behind a VPN or jump host requiring authentication before access is permitted
• Monitor and alert on any connection attempts to HiVision services from unauthorized sources

# Example firewall rule to restrict HiVision access to management VLAN only
# Adjust ports and IP ranges according to your environment
iptables -A INPUT -p tcp -s 10.10.50.0/24 --dport 11116 -j ACCEPT
iptables -A INPUT -p tcp --dport 11116 -j DROP