HTB Irked

-

Lessons Learned

  1. Debian doesn't have the command sudo if root password is set.
  2. steghide extract -sf irked.jpg (steghide exists).
  3. TEST OUT ALL SUIDS THAT DON'T END UP IN DEFAULT.
  4. HexChat is an IRC client.

Walkthrough

I first do an aggressive nmap scan. I find a web server with a few IRC ports open.

I connect via netcat on port 6697, 8067, and 65534. I see some activity going on. The other port, 40542 is not responding. From using IRC in the past, I know I need an IRC client. I download HexChat to use.

I see that the banner version is displaying when I connect. It says Unreal3.2.8.1. I try out some exploits and find this one works the best: https://github.com/Ranger11Danger/UnrealIRCd-3.2.8.1-Backdoor

Open up exploit.py and change the lines to your IP Address and port

Be careful with the shell. If it gets stuck, you will need to restart the box. A trick of mine is to have the shell open up another shell with OpenBSD Netcat. If I quit the second shell, the first shell will go back to normal.

This part I had to look up. I guess you would know to use steghide if you encountered it before. The image contains a pass.txt and with the .backup password, you can open it.

I return to my shell tab and input the password for djmardov.

I tried a few different things to Priv Esc. I was confused on why sudo wasn't on the box. I found a few answers that said something along the lines of this: https://unix.stackexchange.com/questions/106529/why-is-sudo-not-installed-by-default-in-debian. All of my sudo jutsus were trashed. LinPeas wasn't picking up anything. Neither was LinEnum. I ran Lin-Local-Suggester and found DirtyC0w was highly possible. I tried 3 dirtyc0w exploits and they failed. I noticed viewuser in suid and that was the way to escalate.

Comments

Post a Comment

Popular posts from this blog

HTB - Jarvis MySQL

-
Image
Brad Traversy MySQL CheatSheet PentestMonkey SQL CheatSheet MySQL Statement Architecture Jarvis Walkthrough Step 1 - Try to make your query. Visualize it. SELECT Id, Name, Rating, Picture, Cost, Description, UNKNOWN7Field FROM Room WHERE Id = 1 Queries don't need a " or ' Keep going up until it works http://10.10.10.143/room.php?cod=3 union select 1,2,3,4 http://10.10.10.143/room.php?cod=3 union select 1,2,3,4,5 http://10.10.10.143/room.php?cod=3 union select 1,2,3,4,5,6 http://10.10.10.143/room.php?cod=3 union select 1,2,3,4,5,6,7 -OR- http://10.10.10.143/room.php?cod=3 order by 1,2,3,4,5,6,7 The union select works when the left and right are equal in column size. If the left has 7 selections, the right needs 7 selections too SELECT Id, Rating, Name, Cost, Description, UNKNOWN6 FROM Room WHERE Id = 1 UNION SELECT 1,2,3,4,5,6 In order to shift to the right side, put in a faulty value for 1 like negative 1 or 9999 SELECT Id, Rating, Name, Co
Read more

Palo Alto for GNS3 CCDC Tutorial

-
Image
Opening Hello fellow CCDC Competitors! Struggling to get a Palo-Alto VM? I know how you can get one! Email me at ASzampiasSWD@gmail.com. I'll tell you the steps to get a PA-VM for GNS3. Why am I giving this info to you? Wouldn't it make sense to hog the info to myself? Wouldn't my team have an advantage? There are have and have not universities when it comes to PaloAltos. I fell into the "have not" group. Our college didn't have access to PA-VMs and still doesn't. Even if PA Cybersecurity Academy is free, there is too much red tape. I can't change the outcome. I can only come up with this one solution. Another reason is Tri-C is a tryout team. I think its pretty unfair as a potential Firewall Admin I'm the only one with access. No one can challenge me unless they spend 2K for a PA-VM. It becomes a rich-person only position. I have a leftover PA-VM from 2018 I promised not to share. I couldn't share that with my challengers. But I f
Read more

Trace Labs Global Missing Persons CTF V

-
Image
Trace Labs CTF V TraceLabs hosted the Global Missing Persons CTF V event on July 11, 2020. My team //synergy got 64th place out of 190 teams. Introduction This was my first Trace Labs CTF. I captained a team. The good thing about being a captain is you can control who is on the team. My rules were: Must have sock puppet accounts ready. Must have a VPN. Writing out this is a competitive team where we work the entire 6 hours. I was worried about a future team member spamming submissions and disqualifying the team. I thought my requirements would eliminate people who weren't serious. The team hit 4 members Friday evening pretty quickly. Notes My laptop was too slow for this event. My virtual machine froze and I had to restart. Restarting means I have to login to my accounts again. I'll use my desktop next time. The team used Slack and Trello. Our strategy was to research a person and rotate every hour. This strategy broke after 1 rotation. Some missin
Read more