CVE-2020-9120
📋 TL;DR
A resource management error vulnerability in Huawei CloudEngine 1800V allows remote attackers to send specific messages that disrupt normal message forwarding. This affects CloudEngine 1800V devices running vulnerable software versions. Attackers could potentially cause denial of service or other impacts.
💻 Affected Systems
- Huawei CloudEngine 1800V
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete disruption of network traffic forwarding, causing denial of service for connected systems and potential cascading network failures.
Likely Case
Degraded network performance, intermittent packet loss, and potential service disruption for applications relying on the affected device.
If Mitigated
Limited impact with proper network segmentation and monitoring, potentially only affecting isolated network segments.
🎯 Exploit Status
Exploitation requires sending specific message types to the device, but exact details are not publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V100R019C10SPC600 or later
Vendor Advisory: https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20201202-01-cloudengine-en
Restart Required: Yes
Instructions:
1. Download the patched firmware version V100R019C10SPC600 or later from Huawei support portal. 2. Backup current configuration. 3. Upload and install the new firmware. 4. Reboot the device. 5. Verify the new version is running.
🔧 Temporary Workarounds
Network Access Control
allRestrict network access to CloudEngine 1800V management interfaces to trusted sources only.
Configure ACLs to limit access to device management interfaces
Traffic Filtering
allImplement network filtering to block suspicious message types targeting the device.
Configure firewall rules to filter traffic to CloudEngine 1800V
🧯 If You Can't Patch
- Isolate the CloudEngine 1800V device in a separate network segment with strict access controls.
- Implement network monitoring and intrusion detection to alert on suspicious traffic patterns targeting the device.
🔍 How to Verify
Check if Vulnerable:
Check the device firmware version via CLI: display versionCheck Version:
display versionVerify Fix Applied:
After patching, verify the version shows V100R019C10SPC600 or later and test message forwarding functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual message processing errors
- Resource exhaustion warnings
- Forwarding plane disruptions
Network Indicators:
- Abnormal traffic patterns to CloudEngine 1800V
- Sudden drops in forwarded traffic
- Increased error rates
SIEM Query:
source="CloudEngine" AND (message_processing_error OR forwarding_disruption)