CVE-2024-55399
📋 TL;DR
This Server-Side Request Forgery (SSRF) vulnerability in 4C Strategies Exonaut allows attackers to make unauthorized requests from the vulnerable server to internal or external systems. Organizations using Exonaut versions before v21.6.2.1-1 are affected, potentially exposing internal network resources or enabling data exfiltration.
💻 Affected Systems
- 4C Strategies Exonaut
📦 What is this software?
Exonaut by 4cstrategies
Exonaut by 4cstrategies
⚠️ Risk & Real-World Impact
Worst Case
Attackers could pivot to internal systems, access sensitive data, or perform reconnaissance on internal networks by making the vulnerable server proxy requests to restricted resources.
Likely Case
Information disclosure from internal services, port scanning of internal networks, or limited data exfiltration through the vulnerable server.
If Mitigated
Limited impact with proper network segmentation and egress filtering, potentially only exposing metadata about internal services.
🎯 Exploit Status
SSRF typically requires some level of access to trigger the vulnerable functionality, though authentication requirements are not specified in available references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v21.6.2.1-1 and later
Vendor Advisory: http://exonaut.com
Restart Required: No
Instructions:
1. Download Exonaut v21.6.2.1-1 or later from official vendor sources. 2. Follow vendor upgrade procedures. 3. Verify successful upgrade and functionality.
🔧 Temporary Workarounds
Network Segmentation and Egress Filtering
allRestrict outbound network traffic from the Exonaut server to only necessary destinations and protocols.
Input Validation Enhancement
allImplement strict validation of user-supplied URLs or host parameters to prevent SSRF attempts.
🧯 If You Can't Patch
- Implement strict network egress filtering to limit the Exonaut server's outbound connections
- Deploy web application firewall (WAF) rules to detect and block SSRF patterns in requests
🔍 How to Verify
Check if Vulnerable:
Check Exonaut version in administration interface or configuration files. If version is below v21.6.2.1-1, the system is vulnerable.Check Version:
Check Exonaut web interface administration panel or consult application documentation for version information.Verify Fix Applied:
Confirm version is v21.6.2.1-1 or higher and test SSRF functionality with controlled test cases.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP/HTTPS requests from Exonaut server to internal IP ranges
- Requests to metadata services (169.254.169.254, etc.)
- Multiple failed connection attempts to various internal ports
Network Indicators:
- Exonaut server making unexpected connections to internal services
- Traffic patterns indicating port scanning from the Exonaut server
SIEM Query:
source_ip="exonaut_server_ip" AND (dest_ip=PRIVATE_IP_RANGE OR dest_ip=169.254.169.254 OR dest_port_SCAN_PATTERN)