CVE-2024-41685
📋 TL;DR
This vulnerability in SyroTech SY-GPON-1110-WDONT routers allows attackers to steal session cookies from the web management interface due to missing HTTPOnly flags. Attackers with network access can intercept these cookies to gain unauthorized access to router administration. All users of affected routers with the web interface enabled are vulnerable.
💻 Affected Systems
- SyroTech SY-GPON-1110-WDONT Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full administrative control of the router, enabling network traffic interception, DNS manipulation, credential theft from connected devices, and persistent backdoor installation.
Likely Case
Attacker captures admin session cookies, accesses router configuration, changes network settings, and potentially intercepts unencrypted traffic passing through the router.
If Mitigated
With proper network segmentation and access controls, impact is limited to the router's management interface without compromising internal network resources.
🎯 Exploit Status
Exploitation requires the attacker to have network access to intercept HTTP traffic. No authentication bypass is needed as the vulnerability is in cookie handling.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor for specific patched firmware version
Vendor Advisory: https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2024-0225
Restart Required: Yes
Instructions:
1. Access router web interface. 2. Navigate to firmware update section. 3. Download latest firmware from SyroTech vendor site. 4. Upload and apply firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Web Management Interface
allDisable the vulnerable web interface and use alternative management methods
Access router CLI via SSH/Telnet
Disable HTTP service in configuration
Restrict Management Interface Access
allLimit web interface access to specific trusted IP addresses only
Configure firewall rules to restrict access to router management IP:port
🧯 If You Can't Patch
- Isolate router management interface on separate VLAN with strict access controls
- Implement network monitoring for unauthorized access attempts to router management interface
🔍 How to Verify
Check if Vulnerable:
Inspect browser developer tools while accessing router web interface - check if session cookies have HTTPOnly flag set (should be false if vulnerable)Check Version:
Check router web interface status page or use CLI command 'show version' via SSH/TelnetVerify Fix Applied:
After patching, verify session cookies now have HTTPOnly flag set to true in browser developer tools📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts to router web interface
- Unusual configuration changes in router logs
- Access from unexpected IP addresses to management interface
Network Indicators:
- HTTP traffic interception attempts to router management IP
- Unusual outbound connections from router after compromise
SIEM Query:
source="router_logs" AND (event="configuration_change" OR event="admin_login" FROM NOT trusted_ips)