CVE-2019-19838
📋 TL;DR
CVE-2019-19838 is a critical remote code execution vulnerability in Ruckus Wireless Unleashed firmware that allows unauthenticated attackers to execute arbitrary operating system commands via a crafted POST request. This affects network administrators and organizations using vulnerable Ruckus wireless access points and controllers. Attackers can gain complete control over affected devices.
💻 Affected Systems
- Ruckus Wireless Unleashed
📦 What is this software?
Unleashed by Ruckuswireless
⚠️ Risk & Real-World Impact
Worst Case
Full compromise of wireless infrastructure leading to network takeover, credential theft, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Unauthenticated remote attackers execute arbitrary commands to disrupt wireless services, steal sensitive network configurations, or deploy malware.
If Mitigated
With proper network segmentation and access controls, impact is limited to the wireless management network segment.
🎯 Exploit Status
Exploit requires sending a single crafted HTTP POST request to the vulnerable endpoint. Multiple public demonstrations and proof-of-concept code exist.
🛠️ 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 latest firmware from Ruckus support portal. 2. Backup current configuration. 3. Upload and apply firmware update via web interface or CLI. 4. Reboot device. 5. Verify firmware version.
🔧 Temporary Workarounds
Network Segmentation
allIsolate wireless management interface from untrusted networks
Access Control Lists
allRestrict access to management interface to trusted IP addresses only
🧯 If You Can't Patch
- Immediately isolate affected devices from internet and untrusted networks
- Implement strict firewall rules to block all access to admin/_cmdstat.jsp endpoint
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface (System > About) or CLI command 'show version'. If version is 200.7.10.102.64 or earlier, device is vulnerable.Check Version:
show versionVerify Fix Applied:
Verify firmware version is 200.7.10.102.92 or later. Test by attempting to access admin/_cmdstat.jsp endpoint - should return error or be inaccessible.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /admin/_cmdstat.jsp with xcmd=get-platform-depends parameter
- Unusual command execution in system logs
- Multiple failed authentication attempts followed by successful command execution
Network Indicators:
- HTTP traffic to wireless management interface containing uploadFile parameter
- Unusual outbound connections from wireless controllers
SIEM Query:
source="ruckus" AND (url="/admin/_cmdstat.jsp" OR (method="POST" AND params CONTAINS "xcmd=get-platform-depends"))🔗 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
