CVE-2025-46658
📋 TL;DR
CVE-2025-46658 is an information disclosure vulnerability in 4C Strategies ExonautWeb where verbose error messages expose sensitive system information. Attackers can use this information to map the application's structure and potentially identify other vulnerabilities. Organizations using Exonaut 21.6 are affected.
💻 Affected Systems
- 4C Strategies ExonautWeb
📦 What is this software?
Exonaut by 4cstrategies
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain detailed system information, database schemas, file paths, and internal IPs, enabling targeted attacks, privilege escalation, or full system compromise through chained vulnerabilities.
Likely Case
Information leakage that helps attackers understand the application architecture, identify other weaknesses, and reduce attack complexity for subsequent exploitation.
If Mitigated
Limited information disclosure with no direct system access, though still providing reconnaissance value to attackers.
🎯 Exploit Status
Exploitation requires triggering error conditions through malformed requests or invalid inputs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.4cstrategies.com/solutions/exonaut/
Restart Required: No
Instructions:
1. Monitor vendor website for security updates. 2. Apply patch when available. 3. Test in non-production environment first.
🔧 Temporary Workarounds
Disable Detailed Error Messages
allConfigure application to return generic error messages instead of verbose system details.
Edit web.config or application settings to set customErrors mode="On" or "RemoteOnly"
Set debug="false" in compilation settings
Implement Web Application Firewall Rules
allBlock requests that trigger verbose error responses or filter error messages at network perimeter.
WAF rule: Block responses containing stack traces, file paths, or SQL errors
🧯 If You Can't Patch
- Isolate ExonautWeb behind reverse proxy with error message filtering
- Implement strict network segmentation and limit external access
🔍 How to Verify
Check if Vulnerable:
Send malformed requests to ExonautWeb endpoints and check if responses contain detailed error information like stack traces, file paths, or database details.Check Version:
Check Exonaut administration panel or web interface for version information.Verify Fix Applied:
Test with same malformed requests and verify only generic error messages are returned without system details.📡 Detection & Monitoring
Log Indicators:
- Multiple 500 Internal Server Error responses
- Error logs containing detailed stack traces
- Unusual request patterns triggering errors
Network Indicators:
- HTTP responses containing 'System.Exception', stack traces, or file paths
- Increased error response traffic
SIEM Query:
source="web_server" AND (status=500 OR message="*Exception*" OR message="*at *")