CVE-2022-34592
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Wavlink WL-WN575A3 routers via a crafted POST request to the obtw function. It affects users of the specified router model running the vulnerable firmware version, potentially leading to full device compromise.
💻 Affected Systems
- Wavlink WL-WN575A3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full control of the router, enabling them to intercept traffic, deploy malware, pivot to internal networks, or brick the device.
Likely Case
Unauthenticated remote code execution resulting in device takeover, data theft, or use in botnets.
If Mitigated
Limited impact if the device is isolated or patched, but still poses risk if exposed.
🎯 Exploit Status
Exploit details and proof-of-concept are publicly available in GitHub repositories, making it easy for attackers to leverage.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
Check Wavlink's official website or support for firmware updates; if none, consider workarounds or replacement.
🔧 Temporary Workarounds
Network Isolation
allRestrict access to the router's management interface to trusted internal networks only.
Configure firewall rules to block external access to the router's IP on management ports (e.g., 80, 443).
Disable Unused Services
allTurn off remote management features if not required to reduce attack surface.
Access router settings via web interface and disable remote administration or unnecessary services.
🧯 If You Can't Patch
- Replace the router with a model that receives security updates and is not vulnerable.
- Implement strict network segmentation to limit the router's exposure and monitor for suspicious activity.
🔍 How to Verify
Check if Vulnerable:
Check the firmware version in the router's web interface under System or Admin settings; if it matches RPT75A3.V4300.201217, it is vulnerable.Check Version:
Log into the router's web interface and navigate to the system information page to view the firmware version.Verify Fix Applied:
Update to a newer firmware version from Wavlink and confirm the version has changed away from the vulnerable one.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to paths containing 'obtw', unexpected command execution logs, or failed login attempts.
Network Indicators:
- Suspicious traffic to the router's management port from untrusted sources, especially with crafted payloads.
SIEM Query:
Example: search for 'POST /cgi-bin/obtw' in web logs with non-standard parameters or shell commands.