Active Hard HTB Machine: A Deep Dive Into Penetration Testing Techniques

In this article, we explore the intricacies of penetration testing through the lens of an active Hard HTB (Hack The Box) machine. The focus is on exploiting vulnerabilities in a Linux environment, leveraging tools like Ghidra for binary analysis, and executing privilege escalation techniques.

Key Steps and Commands:

1. Binary Analysis with Ghidra:

Use Ghidra to decompile the binary and identify hardcoded shared memory (shm) size and mode.
Command to open binary in Ghidra:
```
ghidraRun
```

2. Exploiting Shared Memory:

Leak the shared memory location using the identified shm size and mode.
Attach to the process using the shmkey:
```
ipcs -m
```

Inject a command to execute chmod +s /bin/bash:

echo 'chmod +s /bin/bash' | ./vulnerable_binary

3. Privilege Escalation:

Utilize infinite loops to maintain root access:
```
while true; do sudo ./root_script; done
```

4. User Exploitation:

Exploit a CVE on a web portal to obtain a hash.
Crack the hash using tools like John the Ripper:
```
john --format=raw-md5 hash.txt
```
Use leaked passwords to access another web portal and discover exposed file paths.

5. SSH with OTP:

Research and implement OTP for SSH access.

Sync time with the server and SSH in:

ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no user@host

What Undercode Say:

Penetration testing is a critical skill in cybersecurity, requiring a deep understanding of system vulnerabilities and exploitation techniques. The process often involves binary analysis, memory manipulation, and privilege escalation. Tools like Ghidra, John the Ripper, and SSH are indispensable in this field.

In Linux environments, commands such as `ipcs -m` for shared memory analysis, `chmod +s` for setting SUID bits, and `john` for hash cracking are essential. Additionally, understanding how to manipulate system processes with infinite loops and exploit CVEs can lead to successful penetration.

For further reading on binary analysis and exploitation, visit Ghidra’s official documentation. To learn more about OTP and SSH, check out SSH.com’s guide on OTP.

Mastering these techniques not only enhances your penetration testing skills but also deepens your understanding of system security. Always ensure you have proper authorization before performing any penetration testing activities.

Conclusion:

Penetration testing is an ever-evolving field that demands continuous learning and practice. By mastering tools like Ghidra, John the Ripper, and understanding the intricacies of Linux system vulnerabilities, you can significantly enhance your cybersecurity skills. Remember, ethical hacking is about securing systems, not exploiting them without permission. Keep practicing, stay updated with the latest vulnerabilities, and always follow ethical guidelines.

References:

initially reported by: https://www.linkedin.com/posts/matthew-y-138494200_owned-checker-from-hack-the-box-activity-7300293810683617281-bO5S – Hackers Feeds
Extra Hub:
Undercode AI

Listen to this Post