CVE-2024-41125
📋 TL;DR
CVE-2024-41125 is an out-of-bounds read vulnerability in Contiki-NG's SNMP module that could allow attackers to read one byte of memory beyond an allocated buffer. This affects IoT devices running Contiki-NG with SNMP enabled, though SNMP is disabled by default. The vulnerability could potentially leak sensitive information or cause crashes.
💻 Affected Systems
- Contiki-NG operating system
📦 What is this software?
Contiki Ng by Contiki Ng
⚠️ Risk & Real-World Impact
Worst Case
Information disclosure of sensitive memory contents, potential system crash leading to denial of service, or as a stepping stone for further exploitation.
Likely Case
System crash or denial of service on affected IoT devices, potentially disrupting device functionality.
If Mitigated
No impact if SNMP is disabled (default configuration) or the patch is applied.
🎯 Exploit Status
Exploitation requires sending a specially crafted SNMP packet to a vulnerable device with SNMP enabled.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch available in pull request #2936, will be included in next Contiki-NG release
Vendor Advisory: https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-qjj3-gqx7-438w
Restart Required: Yes
Instructions:
1. Apply the patch from pull request #2936 manually. 2. Rebuild Contiki-NG with the patched source. 3. Deploy the updated firmware to affected devices. 4. Alternatively, wait for the next Contiki-NG release and update to that version.
🔧 Temporary Workarounds
Disable SNMP module
allDisable the SNMP module in Contiki-NG build configuration to eliminate the vulnerability
Modify build configuration to set SNMP_CONF_ENABLED=0 or equivalent
🧯 If You Can't Patch
- Disable SNMP functionality on all affected devices
- Implement network segmentation to isolate devices with SNMP enabled from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check if SNMP is enabled in Contiki-NG build configuration and if the device is running a version without the patch from pull request #2936.Check Version:
Check Contiki-NG version and build configuration for SNMP enablementVerify Fix Applied:
Verify the patch from pull request #2936 is applied in the source code or that SNMP is disabled in the build configuration.📡 Detection & Monitoring
Log Indicators:
- Unexpected device crashes or restarts
- SNMP-related error messages in device logs
Network Indicators:
- Unusual SNMP traffic to IoT devices
- SNMP packets with malformed length fields
SIEM Query:
Search for SNMP traffic to IoT device IPs followed by device crash/restart events