CVE-2023-49913
📋 TL;DR
A stack-based buffer overflow vulnerability in TP-Link EAP225/EAP115 access points allows authenticated attackers to execute arbitrary code via specially crafted HTTP requests to the web interface's Radio Scheduling functionality. This affects organizations using these specific access point models with vulnerable firmware versions. Attackers can gain full control of the device.
💻 Affected Systems
- TP-Link EAP225 V3
- TP-Link EAP115
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the access point leading to network pivoting, credential harvesting, man-in-the-middle attacks, and persistent backdoor installation.
Likely Case
Unauthorized access to network traffic, device configuration changes, and potential lateral movement to connected systems.
If Mitigated
Limited to authenticated attackers only, with proper network segmentation preventing lateral movement.
🎯 Exploit Status
Detailed technical analysis and proof-of-concept available in Talos reports. Requires authentication but exploit is well-documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check TP-Link security advisories for latest patched versions
Vendor Advisory: https://www.tp-link.com/support/security/
Restart Required: Yes
Instructions:
1. Check current firmware version via web interface. 2. Download latest firmware from TP-Link support site. 3. Upload firmware via web interface System Tools > Firmware Upgrade. 4. Reboot device after upgrade completes.
🔧 Temporary Workarounds
Disable web interface access
allRestrict access to management interface to trusted IPs only
Configure firewall rules to block external access to port 80/443 on AP management IP
Disable Radio Scheduling feature
allTurn off vulnerable functionality if not required
Navigate to Radio Scheduling in web interface and disable all scheduling
🧯 If You Can't Patch
- Segment access points on isolated VLAN with strict firewall rules
- Implement strong authentication and limit admin access to minimum required users
🔍 How to Verify
Check if Vulnerable:
Check firmware version in web interface: System Tools > Firmware Upgrade. Compare with vulnerable versions listed above.Check Version:
Web interface: System Tools > Firmware Upgrade shows current versionVerify Fix Applied:
Verify firmware version is newer than vulnerable versions and test Radio Scheduling functionality.📡 Detection & Monitoring
Log Indicators:
- Multiple HTTP POST requests to /cgi-bin/luci/ with action parameter manipulation
- Unusual authentication attempts to web interface
Network Indicators:
- HTTP traffic to access point management interface with unusual parameter lengths
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
source="access_point_logs" AND (url="/cgi-bin/luci/" AND method="POST" AND param="action" AND length>threshold)