CVE-2023-49255
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute commands with administrative privileges on affected routers by exploiting shared session state. Attackers can create new admin accounts with chosen passwords when any user is logged in with admin rights. All users of vulnerable router models with default configurations are affected.
💻 Affected Systems
- Specific router models not specified in provided references
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attackers to create persistent admin accounts, intercept network traffic, modify configurations, and potentially pivot to internal networks.
Likely Case
Unauthorized administrative access leading to network monitoring, configuration changes, and potential credential theft from connected devices.
If Mitigated
Limited impact if proper network segmentation, authentication controls, and monitoring are in place to detect unauthorized access attempts.
🎯 Exploit Status
Exploitation requires no authentication and minimal technical skill. Attackers need to identify when admin users are logged in to execute commands in their context.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: Not provided in references
Restart Required: No
Instructions:
1. Check vendor website for security advisories
2. Apply firmware updates if available
3. Verify patch addresses session state sharing and authentication requirements
🔧 Temporary Workarounds
Disable router console external access
allRestrict access to router console to internal network only
Configure firewall rules to block external access to router management interface
Implement strong authentication
allRequire multi-factor authentication for administrative access
Configure MFA on router admin accounts if supported
🧯 If You Can't Patch
- Segment router management interface to isolated VLAN with strict access controls
- Implement network monitoring to detect unauthorized access attempts to router console
🔍 How to Verify
Check if Vulnerable:
Attempt to access router console at 'data' field without authentication while another user is logged in. Check if commands can be executed in authenticated user's context.Check Version:
Check router web interface or CLI for firmware version informationVerify Fix Applied:
Verify that router console requires authentication and session states are properly isolated between users.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access attempts to 'data' field
- Unexpected admin user creation
- Multiple simultaneous admin sessions from different IPs
Network Indicators:
- Unusual traffic patterns to router management interface
- Authentication bypass attempts
SIEM Query:
source_ip=external AND destination_port=router_management_port AND (uri_path CONTAINS 'data' OR event_description CONTAINS 'authentication bypass')