CVE-2025-61976
📋 TL;DR
CVE-2025-61976 is an improper condition check vulnerability in CHOCO TEI WATCHER mini (IB-MCT001) that allows remote attackers to send specially crafted requests to the Video Download interface, causing system unresponsiveness. This affects users of the IB-MCT001 device who have the Video Download interface exposed.
💻 Affected Systems
- CHOCO TEI WATCHER mini (IB-MCT001)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system unavailability leading to denial of service for all device functions, potentially requiring physical reset or power cycle to restore functionality.
Likely Case
Temporary service disruption affecting video download functionality and potentially other device operations until system recovers or is manually restarted.
If Mitigated
Limited impact with proper network segmentation and access controls preventing external exploitation attempts.
🎯 Exploit Status
Exploitation requires sending specially crafted requests to the vulnerable interface, which is relatively simple for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched firmware version
Vendor Advisory: https://www.inaba.co.jp/files/chocomini_vulnerability_newly_identified.pdf
Restart Required: Yes
Instructions:
1. Download latest firmware from Inaba vendor site. 2. Follow device firmware update procedure. 3. Reboot device after update completion. 4. Verify firmware version matches patched release.
🔧 Temporary Workarounds
Network Access Restriction
linuxBlock external access to Video Download interface using firewall rules
iptables -A INPUT -p tcp --dport [VIDEO_DOWNLOAD_PORT] -j DROP
Interface Disablement
allDisable Video Download interface if not required for operations
Check device configuration interface for disable option
🧯 If You Can't Patch
- Implement strict network segmentation to isolate device from untrusted networks
- Deploy intrusion prevention systems to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory. Test by sending malformed requests to Video Download interface and monitoring for unresponsiveness.Check Version:
Check device web interface or console for firmware version informationVerify Fix Applied:
Verify firmware version matches patched release. Test with same malformed requests to confirm system remains responsive.📡 Detection & Monitoring
Log Indicators:
- Multiple malformed requests to Video Download interface
- System restart events following unusual request patterns
- Device unresponsiveness logs
Network Indicators:
- Unusual traffic patterns to device Video Download port
- Multiple connection attempts with malformed payloads
SIEM Query:
source_ip=[DEVICE_IP] AND dest_port=[VIDEO_DOWNLOAD_PORT] AND (payload_size>NORMAL OR pattern=SPECIAL_CRAFTED)