CVE-2017-7420
📋 TL;DR
This authentication bypass vulnerability in Micro Focus Enterprise Developer and Enterprise Server allows remote attackers to access and modify configuration information and alter the running state of the product without authentication. It affects organizations using ESMAC (Enterprise Server Monitor and Control) functionality in vulnerable versions.
💻 Affected Systems
- Micro Focus Enterprise Developer
- Micro Focus Enterprise Server
📦 What is this software?
Enterprise Server by Microfocus
Enterprise Server by Microfocus
Enterprise Server by Microfocus
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the enterprise server environment, allowing attackers to modify configurations, disrupt operations, and potentially gain further access to connected systems.
Likely Case
Unauthorized viewing and modification of server configurations, potentially leading to service disruption or data exposure.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to vulnerable interfaces.
🎯 Exploit Status
Authentication bypass vulnerabilities typically have low exploitation complexity once the attack vector is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3 Update 1 Hotfix 8, 2.3 Update 2 Hotfix 9, or later versions
Vendor Advisory: https://community.microfocus.com/microfocus/mainframe_solutions/enterprise_server/w/knowledge_base/29131/enterprise-server-security-fixes-july-2017
Restart Required: Yes
Instructions:
1. Download the appropriate hotfix from Micro Focus support portal. 2. Apply hotfix according to vendor documentation. 3. Restart Enterprise Server services. 4. Verify the fix by checking version and testing authentication controls.
🔧 Temporary Workarounds
Network Isolation
allRestrict network access to ESMAC interfaces to trusted networks only
Firewall Rules
allImplement firewall rules to block external access to Enterprise Server management ports
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems from untrusted networks
- Monitor ESMAC access logs for unauthorized authentication attempts and configuration changes
🔍 How to Verify
Check if Vulnerable:
Check Enterprise Server version against affected versions list. If using 2.3, 2.3 Update 1 without Hotfix 8, or 2.3 Update 2 without Hotfix 9, the system is vulnerable.Check Version:
Check Enterprise Server administration console or configuration files for version informationVerify Fix Applied:
Verify version shows Hotfix 8 or 9 applied, and test that authentication is required for ESMAC configuration access.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to ESMAC endpoints
- Configuration changes without proper authentication logs
- Failed authentication attempts followed by successful configuration access
Network Indicators:
- Unusual traffic patterns to Enterprise Server management ports from unauthorized sources
- Configuration modification requests without authentication headers
SIEM Query:
source="enterprise_server" AND (event_type="config_change" AND auth_status="none") OR (destination_port="management_port" AND src_ip NOT IN trusted_networks)