CVE-2019-19836
📋 TL;DR
CVE-2019-19836 is a critical remote code execution vulnerability in Ruckus Wireless Unleashed access points. It allows unauthenticated attackers to execute arbitrary commands via a crafted POST request to the tools/_rcmdstat.jsp endpoint. All organizations using affected Ruckus Wireless Unleashed firmware versions are vulnerable.
💻 Affected Systems
- Ruckus Wireless Unleashed
📦 What is this software?
Unleashed by Ruckuswireless
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the wireless infrastructure, lateral movement to internal networks, persistent backdoor installation, and data exfiltration.
Likely Case
Unauthenticated remote code execution leading to network disruption, credential theft, and deployment of malware on the access point.
If Mitigated
Limited impact if network segmentation isolates wireless infrastructure and strict firewall rules block external access to management interfaces.
🎯 Exploit Status
Public exploit code and detailed analysis available. The vulnerability is trivial to exploit with a simple HTTP POST request.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 200.7.10.102.92 and later
Vendor Advisory: https://www.ruckuswireless.com/security/299/view/txt
Restart Required: Yes
Instructions:
1. Download the latest firmware from Ruckus support portal. 2. Backup current configuration. 3. Upload and install the new firmware via web interface or CLI. 4. Reboot the access point. 5. Verify the firmware version is 200.7.10.102.92 or later.
🔧 Temporary Workarounds
Block access to vulnerable endpoint
linuxUse firewall rules or web application firewall to block access to /tools/_rcmdstat.jsp
iptables -A INPUT -p tcp --dport 80 -m string --string "/tools/_rcmdstat.jsp" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/tools/_rcmdstat.jsp" --algo bm -j DROP
🧯 If You Can't Patch
- Isolate Ruckus management interfaces from untrusted networks using firewall rules
- Implement network segmentation to limit lateral movement if access points are compromised
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface (Administer > System > About) or CLI command 'show version'. If version is 200.7.10.102.64 or earlier, system is vulnerable.Check Version:
show version (CLI) or check web interface at Administer > System > AboutVerify Fix Applied:
Verify firmware version is 200.7.10.102.92 or later. Test by attempting to access https://<ruckus-ip>/tools/_rcmdstat.jsp - should return 404 or access denied.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /tools/_rcmdstat.jsp
- Unusual process execution on access point
- Configuration changes not initiated by administrators
Network Indicators:
- POST requests to /tools/_rcmdstat.jsp with filename parameters
- Unusual outbound connections from access points
SIEM Query:
source="ruckus-ap" AND (url="/tools/_rcmdstat.jsp" OR method="POST" AND url CONTAINS "_rcmdstat")🔗 References
- https://alephsecurity.com/2020/01/14/ruckus-wireless
- https://fahrplan.events.ccc.de/congress/2019/Fahrplan/events/10816.html
- https://www.ruckuswireless.com/security/299/view/txt
- https://alephsecurity.com/2020/01/14/ruckus-wireless
- https://fahrplan.events.ccc.de/congress/2019/Fahrplan/events/10816.html
- https://www.ruckuswireless.com/security/299/view/txt
