Conceal uses IPSec to secure connectivity to the server and nothing is exposed by default except SNMP and IPSec. After finding the preshared key by enumerating with SNMP, we connect to the server, upload an ASP payload to gain RCE then privesc to SYSTEM using RottenPotato. Not a bad box overall, but the initial part of figuring out the IPSec configuration parameters took me a while to figure out/guess.
Lightweight was a fun box that uses Linux capabilities set on tcpdump so we can capture packets on the loopback interface and find credentials in an LDAP session. We then find more credentials in the source code of the web application and finally priv esc to root by abusing a copy of the openssl program that all has Linux caps set on it.
Bighead was an extremely difficult box by 3mrgnc3 that starts with website enumeration to find two sub-domains and determine there is a custom webserver software running behind an Nginx proxy. We then need to exploit a buffer overflow in the HEAD requests by creating a custom exploit. After getting a shell, there’s some pivoting involved to access a limited SSH server, then an LFI to finally get a shell as SYSTEM. For the final stretch there is an NTFS alternate data stream with a Keepass file that contains the final flag.
Irked is an easy box running a backdoored UnrealIRC installation. I used a Metasploit module to get a shell then ran steghide to obtain the SSH credentials for the low privileged user then got root by exploiting a vulnerable SUID binary.
Teacher uses the Moodle Open Source Learning platform and contains a vulnerability in the math formula that gives us RCE. The credentials for the Moodle application are found in a .png file that contains text instead of an actual image. After getting a shell with the math formula, we find the low privilege user credentials in the MySQL database. We then escalate to root by abusing a backup script running from a cronjob as root.
Redcross has a bit of everything: Cross-Site Scripting, a little bit of SQL injection, reviewing C source code to find a command injection vulnerability, light exploit modification and enumeration.
This is the writeup for Vault, a machine with pivoting across different network segments.
This is the writeup for Curling, a pretty easy box with Joomla running. We can log in after doing basic recon and some educated guessing of the password.
This is the writeup for Frolic, a CTF-like machine with esoteric programming languages and a nice priv esc that requires binary exploitation.
This is the writeup for Carrier, a Linux machine I created for Hack the Box requiring some networking knowledge to perform MITM with BGP prefix hijacking.