CVE-2025-8183
📋 TL;DR
A NULL pointer dereference vulnerability in µD3TN allows remote attackers to cause a denial-of-service (DoS) by sending specially crafted non-singleton destination Endpoint Identifiers. This affects all systems running vulnerable versions of µD3TN, a Delay-Tolerant Networking implementation.
💻 Affected Systems
- µD3TN (micro DTN)
📦 What is this software?
Ud3tn by D3tn
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption of µD3TN, preventing all DTN communications until service restart.
Likely Case
Service crash requiring manual restart, causing temporary communication interruption.
If Mitigated
Minimal impact if proper network segmentation and monitoring are in place to detect and block malicious traffic.
🎯 Exploit Status
Simple packet crafting required. The vulnerability is reliably triggerable via network packets.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest version from GitLab repository
Vendor Advisory: https://gitlab.com/d3tn/ud3tn/-/issues/255
Restart Required: Yes
Instructions:
1. Pull latest code from GitLab repository. 2. Rebuild µD3TN from source. 3. Stop current µD3TN service. 4. Replace binary with newly built version. 5. Restart service.
🔧 Temporary Workarounds
Network Filtering
allBlock or filter packets containing non-singleton destination Endpoint Identifiers at network perimeter.
Service Monitoring and Auto-restart
linuxImplement monitoring to detect µD3TN crashes and automatically restart the service.
systemctl enable ud3tn
systemctl start ud3tn
🧯 If You Can't Patch
- Implement strict network access controls to limit who can communicate with µD3TN instances.
- Deploy intrusion detection systems to monitor for exploitation attempts and alert on service crashes.
🔍 How to Verify
Check if Vulnerable:
Check µD3TN version against GitLab repository. If running any version prior to the fix commit, system is vulnerable.Check Version:
ud3tn --version or check build timestamp/git commit hashVerify Fix Applied:
After patching, test by sending crafted packets with non-singleton destination Endpoint Identifiers and verify service remains stable.📡 Detection & Monitoring
Log Indicators:
- µD3TN process crashes
- Segmentation fault errors in system logs
- Service restart events
Network Indicators:
- Unusual packets to µD3TN port with malformed endpoint identifiers
- Spike in connection attempts followed by service unavailability
SIEM Query:
source="systemd" AND "ud3tn" AND ("segmentation fault" OR "crash" OR "SIGSEGV")