CVE-2023-50927
📋 TL;DR
This vulnerability allows attackers to trigger out-of-bounds reads in the RPL-Lite implementation of the RPL protocol in Contiki-NG IoT operating systems. Attackers can exploit insufficient length controls in DIO and DAO messages containing RPL sub-option headers. IoT devices running vulnerable versions of Contiki-NG are affected.
💻 Affected Systems
- Contiki-NG
📦 What is this software?
Contiki Ng by Contiki Ng
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data exfiltration, or device becoming part of a botnet.
Likely Case
Denial of service, information disclosure, or memory corruption leading to device instability.
If Mitigated
Limited impact with proper network segmentation and monitoring, though vulnerability remains present.
🎯 Exploit Status
Exploitation requires sending specially crafted RPL messages to vulnerable devices.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Contiki-NG 4.9
Vendor Advisory: https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-9423-rgj4-wjfw
Restart Required: Yes
Instructions:
1. Update Contiki-NG to version 4.9 or later. 2. Recompile and redeploy firmware to affected IoT devices. 3. Restart devices to apply changes.
🔧 Temporary Workarounds
Manual patch application
allApply code changes from PR #2484 manually if unable to upgrade to 4.9.
git apply patch-from-pr-2484.diff
🧯 If You Can't Patch
- Segment IoT devices on isolated network segments
- Implement network filtering to block malicious RPL traffic
🔍 How to Verify
Check if Vulnerable:
Check Contiki-NG version: if <4.9 and using RPL-Lite, device is vulnerable.Check Version:
Check firmware version or compile-time version defines in Contiki-NG sourceVerify Fix Applied:
Verify Contiki-NG version is 4.9 or later and confirm PR #2484 changes are present in source code.📡 Detection & Monitoring
Log Indicators:
- Memory access violations
- RPL protocol errors
- Device crashes or restarts
Network Indicators:
- Unusual RPL message patterns
- Malformed DIO/DAO packets
- Traffic from unexpected sources
SIEM Query:
Search for RPL protocol anomalies or memory violation events in device logs