CVE-2025-27024
📋 TL;DR
This vulnerability allows remote authenticated users with Network Administrator privileges in Infinera G42 version R6.1.3 to read and write arbitrary OS files via SFTP connections. The SFTP service fails to properly restrict users to chrooted directories, exposing the entire file system to authorized attackers.
💻 Affected Systems
- Infinera G42
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise including theft of sensitive data, installation of persistent malware, credential harvesting, and disruption of network operations.
Likely Case
Unauthorized access to configuration files, logs, and sensitive system data leading to information disclosure and potential privilege escalation.
If Mitigated
Limited impact if proper network segmentation, least privilege access, and monitoring are in place to detect unusual SFTP activity.
🎯 Exploit Status
Exploitation requires valid Network Administrator credentials and SFTP access. The vulnerability is straightforward to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available references
Vendor Advisory: Not provided in references
Restart Required: No
Instructions:
1. Contact Infinera support for patch availability and guidance. 2. Monitor vendor security advisories for updates. 3. Apply patch when available following vendor instructions.
🔧 Temporary Workarounds
Disable SFTP Service
linuxTemporarily disable SFTP service if not required for operations
# Check vendor documentation for SFTP disable procedure
# Typically involves service management commands
Restrict Network Access
linuxImplement firewall rules to restrict SFTP access to trusted IP addresses only
iptables -A INPUT -p tcp --dport 22 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Infinera G42 devices from untrusted networks
- Enforce least privilege by reviewing and minimizing Network Administrator accounts, implementing multi-factor authentication, and monitoring SFTP access logs
🔍 How to Verify
Check if Vulnerable:
1. Verify system is Infinera G42 version R6.1.3. 2. Test with Network Administrator credentials via SFTP client to attempt access to files outside expected directories (e.g., /etc/passwd).Check Version:
# Check vendor documentation for version command
# Typically: show version or similar CLI commandVerify Fix Applied:
After applying vendor patch or workarounds, retest SFTP access to confirm chroot restrictions are properly enforced.📡 Detection & Monitoring
Log Indicators:
- Unusual SFTP access patterns
- SFTP connections accessing system directories like /etc, /var, /root
- Multiple failed SFTP authentication attempts followed by successful access
Network Indicators:
- SFTP connections from unexpected IP addresses
- High volume of SFTP data transfer
- SFTP sessions accessing non-standard directories
SIEM Query:
source="sftp_logs" AND (path="*/etc/*" OR path="*/root/*" OR path="*/var/*") AND action="read" OR action="write"