CVE-2020-24918
📋 TL;DR
This critical vulnerability allows unauthenticated remote attackers to execute arbitrary code or cause denial-of-service via a buffer overflow in the RTSP service of Ambarella's Oryx RTSP Server. It affects products like the Furbo Dog Camera that use this vulnerable library. The vendor states the RTSP library was intended for demonstration purposes only.
💻 Affected Systems
- Furbo Dog Camera
- Other devices using Ambarella Oryx RTSP Server library
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete remote takeover of affected devices, enabling persistent access, data theft, and use in botnets.
Likely Case
Remote code execution leading to device compromise, surveillance feed interception, or device bricking.
If Mitigated
Denial-of-service crash if exploit fails or controls limit impact.
🎯 Exploit Status
Public exploit details available; used against Furbo Dog Camera in real attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified by vendor
Vendor Advisory: https://github.com/Ambarella-Inc/amba-cve-info/tree/main/cve-2020-24918
Instructions:
No official patch. Vendor recommends not using the RTSP library in production. Contact device manufacturers for firmware updates.
🔧 Temporary Workarounds
Disable RTSP Service
allDisable the vulnerable RTSP service if not required for functionality.
Specific commands depend on device firmware; check manufacturer documentation
Network Segmentation
linuxIsolate affected devices in separate network segments with strict firewall rules.
iptables -A INPUT -p tcp --dport 554 -j DROP
ufw deny 554/tcp
🧯 If You Can't Patch
- Segment affected devices on isolated VLANs with no internet access
- Implement strict network ACLs blocking RTSP port 554 from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check if device uses Ambarella Oryx RTSP Server 2020-01-07 or earlier. Test with crafted RTSP request containing long digest authentication header.Check Version:
Device-specific; check manufacturer firmware version or system logs for RTSP library versionVerify Fix Applied:
Verify RTSP service is disabled or device firmware has been updated by manufacturer.📡 Detection & Monitoring
Log Indicators:
- Unusual RTSP authentication failures
- RTSP service crashes
- Long authentication headers in RTSP requests
Network Indicators:
- RTSP traffic with unusually long authentication headers
- Exploit attempts on port 554
SIEM Query:
source_port=554 AND (http_user_agent CONTAINS "RTSP" OR protocol="RTSP") AND (url_length > 1000 OR header_length > 500)🔗 References
- https://github.com/Ambarella-Inc/amba-cve-info/tree/main/cve-2020-24918
- https://somersetrecon.squarespace.com/blog/2021/hacking-the-furbo-part-1
- https://www.ambarella.com
- https://www.somersetrecon.com/blog
- https://somersetrecon.squarespace.com/blog/2021/hacking-the-furbo-part-1
- https://www.ambarella.com
- https://www.somersetrecon.com/blog
