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Writeup - Valentine (HTB)

·420 words·2 mins·
d3vyce
Author
d3vyce
Cybersecurity, Devops, Infrastructure
Table of Contents

This is a writeup for the Valentine machine from the HackTheBox site.

Enumeration
#

First, let’s start with a scan of our target with the following command:

nmap -sV -T4 -Pn 10.10.10.79

Three TCP port are discovered:

  • 22/tcp : SSH port (OpenSSH 5.9p1)
  • 80/tcp : HTTP (Apache 2.2.22)
  • 443/tcp : HTTPS (Apache 2.2.22)

Exploit
#

First, I start by scanning the site’s folders.

I quickly find the /dev folder where there are 2 files :

To do:

1) Coffee.
2) Research.
3) Fix decoder/encoder before going live.
4) Make sure encoding/decoding is only done client-side.
5) Don't use the decoder/encoder until any of this is done.
6) Find a better way to take notes.
-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-128-CBC,AEB88C140F69BF2074788DE24AE48D46
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-----END RSA PRIVATE KEY-----

This second file is very interesting, it’s an RSA key that should allow me to connect in SSH. The only problem is that it is encrypted and requires a password. So I try to brute force the password. For that I start by extracting a hash with the following command:

ssh2john id_rsa > hash

Then I launch John with the rockyou dictionary.

Unfortunately without success. Let’s look for something else, after performing a vulnerability scan with Nmap, I find that the machine is vulnerable to CVE-2014-0160. After some research I find this github github.

After some executions I find a string in base64:

┌──(d3vyce㉿kali)-[~/Documents]
└─$ echo "aGVhcnRibGVlZGJlbGlldmV0aGVoeXBlCg==" | base64 -d
heartbleedbelievethehype

It could be a password, so I test to connect with :

I now have SSH access and can retrieve the first flag.

While trying to connect via SSH I got the following error: sign_and_send_pubkey: no mutual signature supported. To solve the problem I had to add to the command: PubkeyAcceptedKeyTypes=+ssh-rsa.

Privilege escalation
#

At first I start by running the linpeas.sh script to find a vulnerability. I quickly find a tmux service executed by root.

After some research I find that it is possible to enter a tmux stream via the -S argument which allows to indicate a socket-path.

tmux -S /.devs/dev_sess

I now have a root shell and I can get the last flag.

Recommendations
#

To patch this host I think it would be necessary to perform a number of actions:

  • Do not leave large files accessible directly from a website
  • Update the machine to fix CVE-2014-0160
  • Do not create a tmux session as root

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