CVE-2019-19416
📋 TL;DR
This vulnerability in Huawei SIP modules allows remote attackers to cause denial of service by sending specially crafted SIP messages. Successful exploitation leads to buffer overflow and dead loop conditions, disrupting affected devices. Organizations using vulnerable Huawei products with SIP functionality are affected.
💻 Affected Systems
- Huawei products with vulnerable SIP modules (specific models listed in Huawei advisory)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption of affected Huawei devices, potentially affecting critical communication infrastructure and requiring physical intervention to restore service.
Likely Case
Intermittent service degradation or temporary outages affecting SIP-based communication services until devices restart or recover.
If Mitigated
No impact if devices are patched, properly segmented, or have network controls blocking malicious SIP traffic.
🎯 Exploit Status
Exploitation requires crafting specific SIP messages but doesn't require authentication. Attackers need knowledge of SIP protocol and target device specifics.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions specified in Huawei advisory SA-20200115-01-SIP
Vendor Advisory: https://www.huawei.com/en/psirt/security-advisories/huawei-sa-20200115-01-sip-en
Restart Required: Yes
Instructions:
1. Check Huawei advisory for affected products and versions. 2. Download appropriate firmware updates from Huawei support portal. 3. Apply updates following Huawei's upgrade procedures. 4. Restart affected devices to activate fixes.
🔧 Temporary Workarounds
Network Segmentation
allRestrict SIP traffic to trusted sources only using firewall rules
SIP Traffic Filtering
allImplement SIP-aware firewalls or session border controllers to filter malicious SIP messages
🧯 If You Can't Patch
- Implement strict network segmentation to isolate SIP services from untrusted networks
- Deploy intrusion prevention systems with SIP protocol anomaly detection capabilities
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against affected versions in Huawei advisory. Verify if SIP service is enabled and exposed.Check Version:
Device-specific commands vary by Huawei product line. Typically via CLI: 'display version' or web interface system information.Verify Fix Applied:
Confirm firmware version has been updated to patched version listed in Huawei advisory. Test SIP functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- Unusual SIP message patterns
- Device crash/restart logs
- Buffer overflow error messages in system logs
- Increased SIP error responses
Network Indicators:
- Malformed SIP packets to target devices
- Unusual SIP traffic patterns
- SIP flood attacks
- Protocol anomalies in SIP headers
SIEM Query:
sourcetype=huawei_syslog ("SIP" OR "session initiation protocol") ("overflow" OR "crash" OR "restart" OR "error")