CVE-2020-9527
📋 TL;DR
This CVE describes a critical buffer overflow vulnerability in firmware developed by Shenzhen Hichip Vision Technology, affecting millions of IoT devices from numerous vendors. Unauthenticated remote attackers can execute arbitrary code via the peer-to-peer (P2P) service, potentially taking full control of affected devices. The vulnerability impacts firmware versions V6 through V20 manufactured after August 9, 2018 through 2020.
💻 Affected Systems
- Accfly
- Alptop
- Anlink
- Besdersec
- BOAVISION
- COOAU
- CPVAN
- Ctronics
- D3D Security
- Dericam
- Elex System
- Elite Security
- ENSTER
- ePGes
- Escam
- FLOUREON
- GENBOLT
- Hongjingtian (HJT)
- ICAMI
- Iegeek
- Jecurity
- Jennov
- KKMoon
- LEFTEK
- Loosafe
- Luowice
- Nesuniq
- Nettoly
- ProElite
- QZT
- Royallite
- SDETER
- SV3C
- SY2L
- Tenvis
- ThinkValue
- TOMLOV
- TPTEK
- WGCC
- ZILINK
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to botnet recruitment, persistent backdoor installation, lateral movement to internal networks, and data exfiltration.
Likely Case
Devices become part of IoT botnets used for DDoS attacks, cryptocurrency mining, or as proxies for malicious traffic.
If Mitigated
Isolated devices with proper network segmentation and disabled P2P services remain protected despite the vulnerability.
🎯 Exploit Status
Exploit code is publicly available and has been used in real-world attacks. The vulnerability requires no authentication and is easily exploitable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory available
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware updates. 2. Check manufacturer websites for security patches. 3. Flash updated firmware if available. 4. Factory reset device after patching.
🔧 Temporary Workarounds
Disable P2P Service
allDisable the peer-to-peer service that contains the vulnerable code
Device-specific - typically in web interface under Network > P2P settings
Network Segmentation
linuxIsolate affected devices from critical networks
iptables -A FORWARD -i eth0 -o eth1 -j DROP
iptables -A FORWARD -i eth1 -o eth0 -j DROP
🧯 If You Can't Patch
- Disconnect devices from internet and use only on isolated VLAN
- Replace affected devices with secure alternatives from reputable vendors
🔍 How to Verify
Check if Vulnerable:
Check device firmware version in web interface or via serial console. Look for Hichip firmware V6-V20 manufactured 2018-2020.Check Version:
Device-specific - typically via web interface at System > Information or similarVerify Fix Applied:
Verify P2P service is disabled in device settings and device is not accessible from external networks.📡 Detection & Monitoring
Log Indicators:
- Unusual P2P connection attempts
- Failed firmware update attempts
- Unexpected device reboots
Network Indicators:
- Unexpected outbound connections from IoT devices
- P2P traffic to unknown external IPs
- Increased bandwidth usage
SIEM Query:
source="iot-device-logs" AND (event="p2p_connection" OR event="buffer_overflow")