CVE-2020-27337
📋 TL;DR
CVE-2020-27337 is an improper input validation vulnerability in Treck's IPv6 stack that allows unauthenticated remote attackers to trigger an out-of-bounds write via network access. This can lead to denial of service or potentially remote code execution. Any system using affected versions of Treck's TCP/IP stack is vulnerable.
💻 Affected Systems
- Treck TCP/IP Stack
- Products embedding Treck TCP/IP Stack
📦 What is this software?
Ipv6 by Treck
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise and potential lateral movement within the network.
Likely Case
Denial of service causing system crashes, reboots, or instability of network services.
If Mitigated
Limited to denial of service with proper network segmentation and intrusion prevention systems.
🎯 Exploit Status
Exploitation requires crafting malicious IPv6 packets but doesn't require authentication. No public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.0.1.68 or later
Vendor Advisory: https://treck.com/vulnerability-response-information/
Restart Required: Yes
Instructions:
1. Contact Treck or your device vendor for updated firmware/software. 2. Apply patch version 6.0.1.68 or later. 3. Reboot affected systems. 4. Verify patch installation.
🔧 Temporary Workarounds
Disable IPv6
allDisable IPv6 functionality if not required for operations
System-specific commands vary by OS/device
Network Segmentation
allSegment affected devices from untrusted networks
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable devices
- Deploy intrusion prevention systems to detect and block malicious IPv6 traffic
🔍 How to Verify
Check if Vulnerable:
Check Treck stack version in device firmware/software documentation or vendor advisoriesCheck Version:
Device-specific - consult vendor documentationVerify Fix Applied:
Verify Treck stack version is 6.0.1.68 or later after patching📡 Detection & Monitoring
Log Indicators:
- System crashes, reboots, or abnormal termination of network services
- Memory corruption errors in system logs
Network Indicators:
- Malformed IPv6 packets targeting vulnerable systems
- Unusual IPv6 traffic patterns
SIEM Query:
source_ip IN (external_ips) AND dest_ip IN (vulnerable_devices) AND protocol=ipv6 AND packet_size>normal_range