CVE-2020-9085
📋 TL;DR
A NULL pointer dereference vulnerability in certain Huawei products allows attackers to cause denial of service by sending specially crafted POST messages. This affects specific Huawei products with insufficient parameter validation, potentially causing abnormal process termination. Organizations using affected Huawei products are vulnerable.
💻 Affected Systems
- Various Huawei products (specific models not detailed in CVE description)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service affecting critical system processes, potentially disrupting device functionality
Likely Case
Service disruption or process crashes affecting specific functionality of the vulnerable product
If Mitigated
Minimal impact with proper network segmentation and input validation controls
🎯 Exploit Status
Exploitation requires crafting specific POST messages but doesn't require authentication. No public exploit code is mentioned.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Huawei security advisory for specific fixed versions
Vendor Advisory: https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20200826-01-pointer_en
Restart Required: Yes
Instructions:
1. Check Huawei advisory for affected products. 2. Apply vendor-provided patches. 3. Restart affected devices. 4. Verify patch installation.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to vulnerable interfaces using firewalls or network ACLs
Input Validation
allImplement additional input validation at network perimeter if possible
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices
- Monitor for abnormal POST requests to vulnerable interfaces
🔍 How to Verify
Check if Vulnerable:
Check Huawei advisory for specific affected products and versions, then compare with your inventoryCheck Version:
Vendor-specific commands vary by product - consult Huawei documentationVerify Fix Applied:
Verify patch installation through vendor update mechanisms and check version numbers📡 Detection & Monitoring
Log Indicators:
- Abnormal process termination logs
- Failed POST request attempts with malformed parameters
Network Indicators:
- Unusual POST requests to Huawei device management interfaces
- Traffic patterns indicating denial of service attempts
SIEM Query:
source="huawei_device" AND (event_type="process_crash" OR http_method="POST" AND status_code="400")