CVE-2026-109618 & CVE-2026-109619: Critical PHP2Shell Flaws in Siemens RUGGEDCOM APE1808 — Detection and Remediation Guide

---
title: Siemens RUGGEDCOM APE1808 Web Service Command Execution
id: 8a4f2b91-3c7e-4d5a-b9f1-2e8d6c1a9f3b
status: experimental
description: Detects PHP or web server processes spawning command shells on Siemens RUGGEDCOM APE1808 devices, indicative of PHP2Shell exploitation.
references:
  - https://www.cisa.gov/news-events/ics-advisories/icsa-26-316-05
  - https://attack.mitre.org/techniques/T1059/
author: Security Arsenal
date: 2026/11/12
tags:
  - attack.execution
  - attack.t1059
logsource:
  category: process_creation
  product: linux
detection:
  selection:
    ParentImage|endswith:
      - '/php'
      - '/php-fpm'
      - '/httpd'
      - '/nginx'
      - '/lighttpd'
      - '/apache2'
    Image|endswith:
      - '/sh'
      - '/bash'
      - '/dash'
      - '/zsh'
      - '/python'
      - '/python3'
      - '/perl'
      - '/nc'
      - '/netcat'
  condition: selection
falsepositives:
  - Legitimate administrative scripts or maintenance tasks executed via web management interfaces.
level: high
---
title: Suspicious PHP longjmp Exploitation Patterns in Web Logs
id: 2b7e9d14-5f3a-4c8b-a2d6-7e1f9b3c5a8d
status: experimental
description: Detects HTTP requests containing patterns commonly associated with PHP longjmp() exploitation or PHP2Shell payloads targeting industrial web interfaces.
references:
  - https://www.cisa.gov/news-events/ics-advisories/icsa-26-316-05
  - https://attack.mitre.org/techniques/T1190/
author: Security Arsenal
date: 2026/11/12
tags:
  - attack.initial_access
  - attack.t1190
logsource:
  category: webserver
  product: linux
detection:
  selection:
    cs-uri-query|contains:
      - 'longjmp'
      - 'setjmp'
      - 'preg_replace'
      - 'eval('
      - 'assert('
      - 'base64_decode('
      - 'shell_exec'
      - 'system('
      - 'passthru('
      - 'exec('
  condition: selection
falsepositives:
  - Legitimate PHP applications using these functions; however, they are rare in industrial control system management interfaces.
level: high

// Hunt for suspicious child processes spawned by web servers or PHP on APE1808 devices ingested via Syslog/CEF
CommonSecurityLog
| where TimeGenerated > ago(24h)
| where DeviceProduct contains "RUGGEDCOM" or DeviceProduct contains "APE1808" or DeviceVendor contains "Siemens"
| where ProcessName in~ ("sh", "bash", "dash", "python", "python3", "perl", "nc", "netcat")
| where ParentProcessName has_any ("php", "httpd", "nginx", "lighttpd", "apache2")
| summarize count() by DeviceName, ProcessName, ParentProcessName, CommandLine, SourceIP, bin(TimeGenerated, 1h)
| order by TimeGenerated desc;

// Alternative: Syslog table for direct syslog ingestion
Syslog
| where TimeGenerated > ago(24h)
| where Computer contains "APE1808" or SyslogMessage contains "RUGGEDCOM"
| where SyslogMessage has_any ("php", "httpd", "nginx") and SyslogMessage has_any ("sh", "bash", "python", "nc")
| project TimeGenerated, Computer, ProcessName, SyslogMessage
| order by TimeGenerated desc;

-- Hunt for suspicious child processes of web servers and PHP on APE1808 devices
SELECT Pid, Name, CommandLine, Exe, Username, CreateTime, Ppid, PpidName
FROM pslist()
WHERE PpidName =~ '(?i)(php|httpd|nginx|lighttpd|apache2)'
  AND Name =~ '(?i)(sh|bash|dash|zsh|python|python3|perl|nc|netcat)'
ORDER BY CreateTime DESC

#!/bin/bash
# Siemens RUGGEDCOM APE1808 CVE-2026-109618/109619 Verification and Hardening Script
# Run on the APE1808 or management station with SSH access

echo "=== RUGGEDCOM APE1808 PHP2Shell Mitigation Script ==="

# 1. Verify current firmware/software version
echo "[+] Checking installed software version..."
cat /etc/os-release 2>/dev/null || echo "OS release info not found"
# Check Siemens-specific version file if present
ls /etc/ruggedcom_version 2>/dev/null && cat /etc/ruggedcom_version

# 2. Check for PHP processes and web servers
echo "[+] Identifying running PHP and web server processes..."
ps aux | grep -E "(php|httpd|nginx|lighttpd|apache2)" | grep -v grep

# 3. Check listening ports for web management interfaces
echo "[+] Checking listening ports..."
netstat -tlnp 2>/dev/null | grep -E ":(80|443|8080|8443)" || ss -tlnp | grep -E ":(80|443|8080|8443)"

# 4. Restrict management interface to trusted networks (if iptables available)
echo "[+] Applying temporary network restrictions..."
# Allow only from management subnet (adjust 192.168.1.0/24 to your management network)
iptables -L INPUT -n | grep -E "(80|443)" > /dev/null 2>&1
if [ $? -eq 0 ]; then
    echo "Web ports open. Consider restricting access:"
    echo "  iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT"
    echo "  iptables -A INPUT -p tcp --dport 443 -j DROP"
else
    echo "No web ports found open or iptables not available."
fi

# 5. Disable PHP error display to prevent information leakage
echo "[+] Checking PHP configuration..."
PHP_INI=$(php --ini 2>/dev/null | grep "Loaded Configuration" | cut -d: -f2 | xargs)
if [ -n "$PHP_INI" ] && [ -f "$PHP_INI" ]; then
    echo "PHP config found at $PHP_INI"
    grep -i "display_errors" "$PHP_INI"
    grep -i "expose_php" "$PHP_INI"
    echo "Recommended: display_errors = Off, expose_php = Off"
else
    echo "PHP CLI not found or config not accessible."
fi

# 6. Check for Palo Alto Networks related files
echo "[+] Checking for PAN-OS components..."
find / -name "*panos*" -o -name "*paloalto*" 2>/dev/null | head -20

echo "[+] Review Siemens advisory and apply official patches: https://www.cisa.gov/news-events/ics-advisories/icsa-26-316-05"
echo "[+] Consult Palo Alto Networks upstream advisories for specific workarounds."