CVE-2019-10056
📋 TL;DR
This vulnerability in Suricata allows remote attackers to cause a denial of service (crash) by sending specially crafted network packets. It affects Suricata IDS/IPS systems running vulnerable versions, potentially disrupting network security monitoring.
💻 Affected Systems
- Suricata
📦 What is this software?
Suricata by Suricata Ids
Suricata by Suricata Ids
⚠️ Risk & Real-World Impact
Worst Case
Complete Suricata service crash leading to loss of network intrusion detection/prevention capabilities, potentially allowing undetected attacks.
Likely Case
Service instability and crashes requiring manual restart, creating security monitoring gaps.
If Mitigated
Minimal impact if Suricata runs in fail-open mode or has redundancy, though detection gaps may still occur.
🎯 Exploit Status
The vulnerability requires sending specific packet types but is straightforward to trigger.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.1.4 and later
Vendor Advisory: https://suricata-ids.org/2019/04/30/suricata-4-1-4-released/
Restart Required: Yes
Instructions:
1. Download Suricata 4.1.4 or later from suricata-ids.org. 2. Stop Suricata service. 3. Install the new version. 4. Restart Suricata service.
🔧 Temporary Workarounds
Rate limiting network traffic
linuxImplement network traffic rate limiting to reduce likelihood of exploitation
iptables -A INPUT -p tcp --dport <suricata_port> -m limit --limit 1000/second -j ACCEPT
iptables -A INPUT -p tcp --dport <suricata_port> -j DROP
🧯 If You Can't Patch
- Implement redundant Suricata instances with automatic failover
- Monitor Suricata process health and implement automatic restart scripts
🔍 How to Verify
Check if Vulnerable:
Check Suricata version: suricata --build-info | grep 'Suricata Version'Check Version:
suricata --build-info | grep 'Suricata Version'Verify Fix Applied:
Verify version is 4.1.4 or later and test with known packet capture that previously caused crashes📡 Detection & Monitoring
Log Indicators:
- Suricata process crashes
- Segmentation fault errors in logs
- Unexpected service restarts
Network Indicators:
- Unusual 28-byte packets to Suricata ports
- Traffic patterns matching the vulnerability trigger
SIEM Query:
source="suricata.log" AND ("segmentation fault" OR "crash" OR "SIGSEGV")