CVE-2024-25659
📋 TL;DR
Infinera TNMS 19.10.3 has an insecure default SFTP server configuration that allows attackers to traverse outside the designated user home directory. This affects all Linux servers running this specific version of the network management system. Attackers can potentially access sensitive system files and directories.
💻 Affected Systems
- Infinera Transcend Network Management System (TNMS)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through access to sensitive configuration files, credentials, or system binaries leading to privilege escalation and lateral movement.
Likely Case
Unauthorized access to sensitive network management data, configuration files, and potentially credential harvesting from accessible directories.
If Mitigated
Limited access to non-critical files if proper directory restrictions and access controls are implemented.
🎯 Exploit Status
Exploitation requires SFTP access credentials but uses standard directory traversal techniques once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for patched version
Vendor Advisory: https://www.cvcn.gov.it/cvcn/cve/CVE-2024-25659
Restart Required: Yes
Instructions:
1. Check vendor advisory for patched version
2. Apply vendor-provided patch or upgrade to fixed version
3. Restart SFTP service and verify configuration
🔧 Temporary Workarounds
Restrict SFTP Directory Access
linuxConfigure SFTP server to enforce chroot jail and prevent directory traversal
Edit SFTP server configuration to include: 'ChrootDirectory /path/to/secure/directory'
Set proper permissions: 'chmod 755 /path/to/secure/directory'
Restart SFTP service
Network Segmentation
linuxRestrict SFTP server access to trusted networks only
Configure firewall rules: 'iptables -A INPUT -p tcp --dport 22 -s trusted_network -j ACCEPT'
iptables -A INPUT -p tcp --dport 22 -j DROP
🧯 If You Can't Patch
- Disable SFTP server if not required for operations
- Implement strict network access controls and monitor all SFTP connections
🔍 How to Verify
Check if Vulnerable:
Check if running TNMS 19.10.3 and test SFTP directory traversal using authenticated accessCheck Version:
Check TNMS version through management interface or consult system documentationVerify Fix Applied:
Test SFTP access after patch to confirm directory traversal is blocked📡 Detection & Monitoring
Log Indicators:
- Unusual SFTP access patterns
- Multiple failed directory traversal attempts
- Access to directories outside expected paths
Network Indicators:
- SFTP connections from unexpected sources
- Unusual data transfer volumes via SFTP
SIEM Query:
source="sftp_logs" AND (event="directory_traversal" OR path="../" OR path="..\")