CVE-2024-47188
📋 TL;DR
CVE-2024-47188 is a denial-of-service vulnerability in Suricata's thash implementation where missing random seed initialization allows attackers to predict hash table behavior. This enables attackers to force excessive data into single hash buckets, causing severe performance degradation. All Suricata deployments prior to version 7.0.7 are affected.
💻 Affected Systems
- Suricata
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service degradation making Suricata unable to process network traffic, effectively disabling intrusion detection/prevention capabilities.
Likely Case
Significant performance degradation causing packet loss, missed detections, and increased latency in network monitoring.
If Mitigated
Minimal impact if traffic filtering prevents malicious hash collisions or if alternative detection mechanisms are in place.
🎯 Exploit Status
Exploitation requires sending specially crafted network traffic but doesn't require authentication or complex techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.0.7
Vendor Advisory: https://github.com/OISF/suricata/security/advisories/GHSA-qq5v-qcjx-f872
Restart Required: Yes
Instructions:
1. Download Suricata 7.0.7 from official sources. 2. Stop Suricata service. 3. Install/upgrade to version 7.0.7. 4. Restart Suricata service. 5. Verify version with 'suricata --build-info'.
🔧 Temporary Workarounds
Rate Limiting
linuxImplement network traffic rate limiting to reduce impact of hash collision attacks
# Example using iptables: iptables -A INPUT -p tcp --dport <suricata_port> -m limit --limit 1000/second -j ACCEPT
# Example using tc: tc qdisc add dev eth0 root handle 1: htb default 1
tc class add dev eth0 parent 1: classid 1:1 htb rate 1000mbit
🧯 If You Can't Patch
- Implement network segmentation to isolate Suricata from untrusted traffic sources
- Deploy additional monitoring to detect performance degradation and hash collision patterns
🔍 How to Verify
Check if Vulnerable:
Run 'suricata --build-info' and check if version is earlier than 7.0.7Check Version:
suricata --build-info | grep 'Version:'Verify Fix Applied:
Confirm version is 7.0.7 or later with 'suricata --build-info' and monitor for performance degradation📡 Detection & Monitoring
Log Indicators:
- Unusual performance degradation logs
- High CPU usage alerts
- Packet processing errors
Network Indicators:
- Sudden increase in specific hash collision patterns
- Abnormal traffic patterns targeting Suricata ports
SIEM Query:
source="suricata" ("performance degradation" OR "high cpu" OR "packet loss")