CVE-2020-27301
📋 TL;DR
A stack buffer overflow vulnerability in Realtek RTL8710 and other Ameba-based WiFi chips allows remote code execution. Attackers within Wi-Fi range can exploit this by sending a crafted encrypted GTK value during WPA2 handshake. This affects IoT devices, routers, and embedded systems using vulnerable Realtek chips.
💻 Affected Systems
- Realtek RTL8710
- Ameba-based devices
- IoT devices with vulnerable Realtek WiFi chips
- Embedded systems using affected chips
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent malware, pivot to other network devices, or use device as botnet node.
Likely Case
Device takeover enabling data theft, network surveillance, or denial of service attacks against the device.
If Mitigated
Limited impact if devices are isolated in separate VLANs with strict network segmentation and monitoring.
🎯 Exploit Status
Exploitation requires attacker to be within Wi-Fi range and capture WPA2 handshake. No authentication needed once handshake is captured.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Vendor-specific firmware updates
Vendor Advisory: https://www.realtek.com/en/
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware updates. 2. Apply firmware patch for affected Realtek chip. 3. Reboot device after update. 4. Verify patch installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate vulnerable devices in separate VLANs to limit attack surface
WPA3 Migration
allUpgrade to WPA3 where supported to avoid vulnerable WPA2 implementation
🧯 If You Can't Patch
- Physically isolate devices from critical networks
- Implement strict network access controls and monitor for suspicious Wi-Fi activity
🔍 How to Verify
Check if Vulnerable:
Check device specifications for Realtek RTL8710 or Ameba chips. Review firmware version against manufacturer advisories.Check Version:
Manufacturer-specific commands vary. Typically via device web interface or serial console.Verify Fix Applied:
Verify firmware version matches patched version from manufacturer. Test device functionality post-update.📡 Detection & Monitoring
Log Indicators:
- Multiple failed WPA2 handshakes
- Unusual device reboots
- Unexpected firmware changes
Network Indicators:
- Abnormal Wi-Fi traffic patterns
- Suspicious 4-way handshake attempts
- Unexpected network connections from IoT devices
SIEM Query:
source="wireless" AND (event="handshake_failure" OR event="authentication_failure") AND device_type="iot"