CVE-2024-35434
📋 TL;DR
CVE-2024-35434 is a heap buffer overflow vulnerability in Irontec Sngrep v1.8.1's RTP packet processing function. Attackers can exploit this by sending a specially crafted SIP packet to cause a Denial of Service (DoS) crash. Organizations using Sngrep for SIP/RTP analysis and monitoring are affected.
💻 Affected Systems
- Irontec Sngrep
📦 What is this software?
Sngrep by Irontec
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption of Sngrep monitoring capabilities, potentially affecting SIP/RTP troubleshooting and security monitoring operations.
Likely Case
DoS causing Sngrep process to crash, requiring manual restart and losing real-time monitoring data during downtime.
If Mitigated
Limited impact if Sngrep runs in isolated environments without internet exposure and with proper resource limits.
🎯 Exploit Status
Exploitation requires sending a crafted SIP packet to Sngrep's monitoring interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.8.2 or later
Vendor Advisory: https://github.com/irontec/sngrep/releases
Restart Required: Yes
Instructions:
1. Download latest version from GitHub releases. 2. Stop Sngrep service. 3. Install new version. 4. Restart Sngrep service.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to Sngrep instances to trusted sources only.
iptables -A INPUT -p tcp --dport 5060 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 5060 -j DROP
Process Monitoring and Auto-restart
linuxMonitor Sngrep process and automatically restart if crashes occur.
systemctl enable sngrep
systemctl start sngrep
🧯 If You Can't Patch
- Implement strict network ACLs to limit traffic to Sngrep from trusted sources only.
- Deploy Sngrep in isolated network segments with no internet exposure.
🔍 How to Verify
Check if Vulnerable:
Check Sngrep version: sngrep --version | grep 'sngrep version'Check Version:
sngrep --versionVerify Fix Applied:
Confirm version is v1.8.2 or later and test with normal SIP traffic.📡 Detection & Monitoring
Log Indicators:
- Sngrep process crashes or segmentation faults in system logs
- Abnormal termination messages
Network Indicators:
- Unusual SIP packets with malformed RTP data sent to monitoring ports
- Traffic patterns targeting Sngrep default ports
SIEM Query:
source="systemd" "sngrep" AND ("segmentation fault" OR "core dumped" OR "killed")