CVE-2024-38267
📋 TL;DR
This vulnerability allows authenticated administrators to cause memory corruption in the IPv6 parser of Zyxel VMG8825-T50K devices, potentially crashing threads. It affects devices running firmware versions through 5.50(ABOM.8)C0. Attackers need administrative credentials to exploit this issue.
💻 Affected Systems
- Zyxel VMG8825-T50K
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Thread crash leading to denial of service, potentially disrupting network services on the affected device.
Likely Case
Localized thread crash affecting specific IPv6 processing functions without complete device failure.
If Mitigated
Minimal impact if proper access controls prevent unauthorized administrative access.
🎯 Exploit Status
Requires authenticated administrative access and knowledge of memory corruption techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 5.50(ABOM.8)C0
Restart Required: Yes
Instructions:
1. Log into Zyxel support portal. 2. Download latest firmware for VMG8825-T50K. 3. Upload firmware via web interface. 4. Apply update and restart device.
🔧 Temporary Workarounds
Disable IPv6
allTurn off IPv6 functionality to prevent exploitation of the vulnerable parser.
Restrict Administrative Access
allLimit administrative access to trusted IP addresses and use strong authentication.
🧯 If You Can't Patch
- Implement strict access controls for administrative interfaces
- Monitor for unusual administrative login attempts or thread crashes
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface: System Info > Firmware VersionCheck Version:
Check via web interface or SSH: show versionVerify Fix Applied:
Verify firmware version is newer than 5.50(ABOM.8)C0📡 Detection & Monitoring
Log Indicators:
- Thread crash logs
- IPv6 processing errors
- Multiple failed admin login attempts
Network Indicators:
- Unusual IPv6 traffic patterns to administrative interfaces
SIEM Query:
source="zyxel" AND (event_type="thread_crash" OR event_type="ipv6_error")