CVE-2020-7131
📋 TL;DR
CVE-2020-7131 is a critical vulnerability in HPE NonStop systems' maintenance entities that allows attackers with access to the maintenance LAN to exploit an open UDP port 17185. This can lead to information disclosure, denial-of-service, memory corruption, or potentially complete system takeover. The vulnerability affects Blade Maintenance Entity, Integrated Maintenance Entity, and Maintenance Entity products on J/H-series NonStop systems.
💻 Affected Systems
- Blade Maintenance Entity
- Integrated Maintenance Entity
- Maintenance Entity
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing full control of the affected NonStop system, potentially leading to data theft, service disruption, or lateral movement within the maintenance network.
Likely Case
Information disclosure and denial-of-service attacks against maintenance entities, disrupting system maintenance capabilities and potentially exposing sensitive maintenance data.
If Mitigated
Limited impact if maintenance LAN is properly segmented and UDP port 17185 is blocked at network boundaries.
🎯 Exploit Status
Exploitation requires network access to the maintenance LAN but no authentication. The vulnerability involves an open UDP service that can be targeted with crafted packets.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SPR T1805A01^AAI (Integrated Maintenance Entity), SPR T4805A01^AAZ (Blade Maintenance Entity)
Vendor Advisory: https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbns03996en_us
Restart Required: Yes
Instructions:
1. Download appropriate SPR from HPE support portal. 2. Apply SPR T1805A01^AAI for Integrated Maintenance Entity or T4805A01^AAZ for Blade Maintenance Entity. 3. Restart affected maintenance entities. 4. Verify UDP port 17185 is no longer open or properly secured.
🔧 Temporary Workarounds
Block UDP Port 17185
allBlock UDP port 17185 at the network switch or firewall level in the maintenance LAN to prevent exploitation.
# Example firewall rule (platform specific)
# iptables -A INPUT -p udp --dport 17185 -j DROP
# Windows: netsh advfirewall firewall add rule name="Block CVE-2020-7131" dir=in action=block protocol=UDP localport=17185
🧯 If You Can't Patch
- Implement strict network segmentation for maintenance LAN, ensuring only authorized maintenance systems can access it.
- Deploy network monitoring and intrusion detection for UDP port 17185 traffic with alerting on suspicious activity.
🔍 How to Verify
Check if Vulnerable:
Check if UDP port 17185 is open and listening on maintenance entity systems using: nmap -sU -p 17185 <maintenance_entity_ip> or netstat -anu | grep 17185Check Version:
Check NonStop system version and installed SPRs using appropriate NonStop commands (varies by system configuration).Verify Fix Applied:
Verify UDP port 17185 is no longer open or properly secured after applying SPRs. Check system logs for successful SPR installation and verify with vendor documentation.📡 Detection & Monitoring
Log Indicators:
- Unexpected connections or traffic to UDP port 17185
- Memory corruption errors in maintenance entity logs
- Denial-of-service events affecting maintenance capabilities
Network Indicators:
- Unusual UDP traffic patterns on port 17185
- Scanning activity targeting port 17185 in maintenance LAN
- Crafted UDP packets to port 17185
SIEM Query:
source_port=17185 OR dest_port=17185 protocol=UDP AND (event_type=scan OR bytes_sent>threshold OR pattern_match="malicious_payload")