CVE-2025-41772
📋 TL;DR
An unauthenticated remote attacker can steal valid session tokens from UBR devices because tokens are exposed in plaintext within URL parameters of the wwwupdate.cgi endpoint. This affects UBR devices with the vulnerable endpoint exposed, allowing session hijacking without authentication.
💻 Affected Systems
- UBR devices with wwwupdate.cgi endpoint
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through session hijacking leading to administrative access, data theft, and further network penetration.
Likely Case
Unauthenticated attackers steal valid session tokens to impersonate legitimate users, potentially accessing sensitive functions or data.
If Mitigated
Limited impact if endpoint is not internet-facing and network segmentation restricts access to trusted sources only.
🎯 Exploit Status
Exploitation requires network access to the vulnerable endpoint; no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - Check vendor for updates
Vendor Advisory: Not provided in reference
Restart Required: No
Instructions:
1. Contact UBR vendor for security patches. 2. Apply any available firmware updates. 3. Verify wwwupdate.cgi endpoint no longer exposes tokens in URL parameters.
🔧 Temporary Workarounds
Block wwwupdate.cgi endpoint
linuxRestrict access to the vulnerable endpoint using firewall rules or web server configuration.
iptables -A INPUT -p tcp --dport 80 -m string --string "wwwupdate.cgi" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "wwwupdate.cgi" --algo bm -j DROP
Implement reverse proxy filtering
allUse a reverse proxy or WAF to filter requests containing session tokens in URL parameters.
🧯 If You Can't Patch
- Isolate affected devices in separate network segment with strict access controls.
- Implement network monitoring for suspicious access to wwwupdate.cgi endpoint.
🔍 How to Verify
Check if Vulnerable:
Send HTTP request to http://[target]/wwwupdate.cgi and check if response contains session tokens in URL parameters or if tokens are visible in server logs.Check Version:
Check device web interface or use vendor-specific CLI commands (varies by UBR model).Verify Fix Applied:
Test that wwwupdate.cgi endpoint no longer exposes session tokens in URL parameters and requires proper authentication.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to wwwupdate.cgi with token parameters in access logs
- Unusual session creation or token usage patterns
Network Indicators:
- Unusual traffic patterns to wwwupdate.cgi endpoint from unauthenticated sources
- HTTP requests containing session tokens in URL parameters
SIEM Query:
source="web_logs" AND uri="*wwwupdate.cgi*" AND (query="*token=*" OR query="*session=*" OR query="*auth=*")