CVE-2021-47858
📋 TL;DR
This stored cross-site scripting vulnerability in Genexis Platinum-4410 routers allows attackers to inject malicious scripts into the 'start_addr' parameter of the Security Management interface. The scripts persist and execute when privileged users access the security management page, potentially compromising administrative sessions. All users of Genexis Platinum-4410 P4410-V2-1.31A routers are affected.
💻 Affected Systems
- Genexis Platinum-4410
⚠️ 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
Attackers could steal administrative credentials, hijack router management sessions, reconfigure network settings, or deploy malware to connected devices.
Likely Case
Attackers with network access could inject scripts to steal session cookies or credentials from administrators, gaining persistent access to router management.
If Mitigated
With proper network segmentation and admin access controls, impact is limited to potential session hijacking within the management interface.
🎯 Exploit Status
Exploit requires access to the router's web interface but no authentication for the vulnerable parameter; public exploit code exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not publicly available
Restart Required: No
Instructions:
Check Genexis website for firmware updates; if available, download and apply through router's web interface.
🔧 Temporary Workarounds
Input Validation Filter
allImplement input validation to sanitize the 'start_addr' parameter
Not applicable - requires code modification
Content Security Policy
allImplement CSP headers to restrict script execution
Not applicable - requires web server configuration
🧯 If You Can't Patch
- Restrict access to router management interface to trusted IP addresses only
- Use separate administrative accounts with minimal privileges and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Access router web interface, navigate to Security Management, attempt to inject script payload into 'start_addr' field and check if it persists.Check Version:
Check router web interface status page or use: telnet/router CLI commands specific to Genexis devicesVerify Fix Applied:
After applying any fix, test the same injection attempt to confirm it's properly sanitized or blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual input patterns in 'start_addr' parameter
- Multiple failed login attempts after script injection
Network Indicators:
- HTTP requests with script tags in 'start_addr' parameter
- Unusual outbound connections from router management interface
SIEM Query:
web.url:*/security* AND web.param:start_addr AND (web.param.value:*script* OR web.param.value:*javascript*)