CVE-2020-28593
📋 TL;DR
An unauthenticated backdoor in Cosori Smart Air Fryer's configuration server allows remote code execution via specially crafted JSON packets. This affects Cosori Smart 5.8-Quart Air Fryer CS158-AF version 1.1.0 users, enabling attackers to potentially take full control of the device without authentication.
💻 Affected Systems
- Cosori Smart 5.8-Quart Air Fryer CS158-AF
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to execute arbitrary code, modify device functionality, access network resources, or use as pivot point for further attacks.
Likely Case
Remote code execution leading to device manipulation, data exfiltration, or integration into botnets.
If Mitigated
Limited impact if device is isolated from untrusted networks and firmware is updated.
🎯 Exploit Status
Exploitation requires sending malicious JSON packet to device's configuration server. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version - check with vendor
Vendor Advisory: https://www.cosori.com/security
Restart Required: Yes
Instructions:
1. Check Cosori website/app for firmware updates. 2. Apply available firmware update. 3. Restart device. 4. Verify update applied successfully.
🔧 Temporary Workarounds
Network Isolation
allIsolate air fryer on separate VLAN or network segment with no internet access
Firewall Rules
allBlock inbound connections to device on all ports except essential ones
🧯 If You Can't Patch
- Disconnect device from network entirely and use only manual controls
- Place device behind strict firewall allowing only outbound connections to Cosori servers
🔍 How to Verify
Check if Vulnerable:
Check device firmware version in Cosori app. If version is 1.1.0, device is vulnerable.Check Version:
Check via Cosori mobile app: Settings > Device Info > Firmware VersionVerify Fix Applied:
Verify firmware version is updated beyond 1.1.0 in Cosori app settings.📡 Detection & Monitoring
Log Indicators:
- Unusual JSON payloads to device configuration port
- Unexpected device reboots or behavior changes
Network Indicators:
- Malformed JSON packets sent to device IP on configuration port
- Unusual outbound connections from device
SIEM Query:
source_ip=* dest_ip=[DEVICE_IP] dest_port=[CONFIG_PORT] payload_contains="malicious_json_pattern"