CVE-2019-16641
📋 TL;DR
This vulnerability allows attackers to bypass authentication on Ruijie EG-2000 series gateways via a buffer overflow in client.so. Attackers can log into any account without providing passwords. This affects EG-2000SE devices running EG_RGOS 11.1(1)B1 firmware.
💻 Affected Systems
- Ruijie EG-2000SE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of gateway device, allowing attacker to reconfigure network, intercept traffic, or use as pivot point to internal network.
Likely Case
Unauthorized administrative access to gateway, enabling network configuration changes and traffic monitoring.
If Mitigated
Limited impact if device is isolated, has strict network controls, and authentication bypass attempts are detected.
🎯 Exploit Status
Exploit requires sending crafted requests to login.php endpoint. Public details available in referenced links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Ruijie security advisory for updated firmware version
Vendor Advisory: Not provided in CVE details
Restart Required: Yes
Instructions:
1. Contact Ruijie support for patched firmware. 2. Backup current configuration. 3. Upload and install patched firmware. 4. Reboot device. 5. Verify fix.
🔧 Temporary Workarounds
Network Isolation
allRestrict access to gateway management interface to trusted IPs only
Configure firewall rules to allow only specific source IPs to access gateway management port
Disable Web Management
allUse CLI management only if web interface not required
Configure device to disable HTTP/HTTPS management interface
🧯 If You Can't Patch
- Implement strict network segmentation to isolate gateway from critical systems
- Enable detailed logging and monitoring for authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or CLI: show versionCheck Version:
show versionVerify Fix Applied:
Verify firmware version is updated beyond vulnerable version and test authentication bypass attempts fail📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login from same IP
- Unusual login.php requests with malformed parameters
Network Indicators:
- HTTP POST requests to login.php with abnormal payload sizes
- Traffic from unexpected sources to gateway management interface
SIEM Query:
source="gateway" AND (url="*login.php*" AND (bytes>1000 OR status=200 AND user="admin"))