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March 9, 2024

AppSanity – HackTheBox Writeup

Thoviti Siddharth HackTheBox, Infosec ASPX, chisel, DLL Hijacking, dnSpy, ffuf, HackTheBox, HTB, JWT, metasploit, meterpreter, Session Hijacking, SSRF, Windows 0

Machine Name: AppSanity
IP: 10.10.11.238
Difficulty: Hard

Summary

AppSanity is a hard difficulty machine that starts with subdomain enumeration and manipulation of the registration process. Utilizing JWT for session hijacking, the journey led to SSRF and finally gaining a user shell through bypassing file-type restrictions. For privilege escalation, analysis of the ExaminationManagement.dll revealed a registry key, providing user credentials. Reverse port forwarding via Chisel unveiled the service on port 100, enabling exploitation of DLL hijacking to escalate privileges and eventually access administrator shell and root flag.

August 26, 2023

OnlyForYou – HackTheBox Writeup

Thoviti Siddharth HackTheBox, Infosec chisel, Cipher Injection, code review, dig, ffuf, Flask, Gogs, HackTheBox, HTB, Lateral Movement, LFI, LinPeas, Linux Box, Neo4j, pip3 download, Port Forwarding, Source Code Review, sub-domain-enumeration 0

Machine Name: OnlyForYou
IP: 10.10.11.210
Difficulty: Medium

Summary

OnlyForYou is a medium machine that starts with discovering a subdomain that is vulnerable to LFI. The LFI is used to read the source code of the application. Improper sanitization of user data in the a part of code that executes shell commands was leveraged to gain a shell as www-data. From this shell, two active ports were found, one of which hosted a login page that used default credentials. The dashboard revealed that the application uses Neo4j database. This information was used to test for Cipher injection. The cipher injection was successful and was used to gain password hashes from the database. The cracked hashes were used to login as user John. Privilege escalation involved abusing the “pip3 download” command that could be run as root by the user.