local mssql = require "mssql" local nmap = require "nmap" local stdnse = require "stdnse" local string = require "string" local table = require "table" local unpwdb = require "unpwdb" -- -*- mode: lua -*- -- vim: set filetype=lua : description = [[ Performs password guessing against Microsoft SQL Server (ms-sql). Works best in conjunction with the broadcast-ms-sql-discover script. SQL Server credentials required: No (will not benefit from mssql.username & mssql.password). Run criteria: * Host script: Will run if the mssql.instance-all, mssql.instance-name or mssql.instance-port script arguments are used (see mssql.lua). * Port script: Will run against any services identified as SQL Servers, but only if the mssql.instance-all, mssql.instance-name and mssql.instance-port script arguments are NOT used. WARNING: SQL Server 2005 and later versions include support for account lockout policies (which are enforced on a per-user basis). If an account is locked out, the script will stop running for that instance, unless the ms-sql-brute.ignore-lockout argument is used. NOTE: Communication with instances via named pipes depends on the smb library. To communicate with (and possibly to discover) instances via named pipes, the host must have at least one SMB port (e.g. TCP 445) that was scanned and found to be open. Additionally, named pipe connections may require Windows authentication to connect to the Windows host (via SMB) in addition to the authentication required to connect to the SQL Server instances itself. See the documentation and arguments for the smb library for more information. NOTE: By default, the ms-sql-* scripts may attempt to connect to and communicate with ports that were not included in the port list for the Nmap scan. This can be disabled using the mssql.scanned-ports-only script argument. ]] --- -- @usage -- nmap -p 445 --script ms-sql-brute --script-args mssql.instance-all,userdb=customuser.txt,passdb=custompass.txt -- nmap -p 1433 --script ms-sql-brute --script-args userdb=customuser.txt,passdb=custompass.txt -- -- @output -- | ms-sql-brute: -- | [192.168.100.128\TEST] -- | No credentials found -- | Warnings: -- | sa: AccountLockedOut -- | [192.168.100.128\PROD] -- | Credentials found: -- | webshop_reader:secret => Login Success -- | testuser:secret1234 => PasswordMustChange -- |_ lordvader:secret1234 => Login Success -- ---- -- @args ms-sql-brute.ignore-lockout WARNING! Including this argument will cause -- the script to continue attempting to brute-forcing passwords for users -- even after a user has been locked out. This may result in many SQL -- Server logins being locked out! -- -- @args ms-sql-brute.brute-windows-accounts Enable targeting Windows accounts -- as part of the brute force attack. This should be used in conjunction -- with the mssql library's mssql.domain argument. -- -- Created 01/17/2010 - v0.1 - created by Patrik Karlsson -- Revised 02/01/2011 - v0.2 (Chris Woodbury) -- - Added ability to run against all instances on a host; -- - Added recognition of account-locked out and password-expired error codes; -- - Added storage of credentials on a per-instance basis -- - Added compatibility with changes in mssql.lua author = "Patrik Karlsson" license = "Same as Nmap--See http://nmap.org/book/man-legal.html" categories = {"brute", "intrusive"} dependencies = {"ms-sql-empty-password"} hostrule = mssql.Helper.GetHostrule_Standard() portrule = mssql.Helper.GetPortrule_Standard() --- Returns formatted output for the given instance local function create_instance_output_table( instance ) local instanceOutput = {} instanceOutput["name"] = string.format( "[%s]", instance:GetName() ) if ( instance.ms_sql_brute.credentials ) then local credsOutput = {} credsOutput["name"] = "Credentials found:" table.insert( instanceOutput, credsOutput ) for username, result in pairs( instance.ms_sql_brute.credentials ) do local password = result[1] local errorCode = result[2] password = password:len()>0 and password or "" if errorCode then local errorMessage = mssql.LoginErrorMessage[ errorCode ] or "unknown error" table.insert( credsOutput, string.format( "%s:%s => %s", username, password, errorMessage ) ) else table.insert( credsOutput, string.format( "%s:%s => Login Success", username, password ) ) end end if ( #credsOutput == 0 ) then table.insert( instanceOutput, "No credentials found" ) end end if ( instance.ms_sql_brute.warnings ) then local warningsOutput = {} warningsOutput["name"] = "Warnings:" table.insert( instanceOutput, warningsOutput ) for _, warning in ipairs( instance.ms_sql_brute.warnings ) do table.insert( warningsOutput, warning ) end end if ( instance.ms_sql_brute.errors ) then local errorsOutput = {} errorsOutput["name"] = "Errors:" table.insert( instanceOutput, errorsOutput ) for _, error in ipairs( instance.ms_sql_brute.errors ) do table.insert( errorsOutput, error ) end end return instanceOutput end local function test_credentials( instance, helper, username, password ) local database = "tempdb" local stopUser, stopInstance = false, false local status, result = helper:ConnectEx( instance ) local loginErrorCode if( status ) then stdnse.debug2("Attempting login to %s as %s/%s", instance:GetName(), username, password ) status, result, loginErrorCode = helper:Login( username, password, database, instance.host.ip ) end helper:Disconnect() local passwordIsGood, canLogin if status then passwordIsGood = true canLogin = true elseif ( loginErrorCode ) then if ( ( loginErrorCode ~= mssql.LoginErrorType.InvalidUsernameOrPassword ) and ( loginErrorCode ~= mssql.LoginErrorType.NotAssociatedWithTrustedConnection ) ) then stopUser = true end if ( loginErrorCode == mssql.LoginErrorType.PasswordExpired ) then passwordIsGood = true elseif ( loginErrorCode == mssql.LoginErrorType.PasswordMustChange ) then passwordIsGood = true elseif ( loginErrorCode == mssql.LoginErrorType.AccountLockedOut ) then stdnse.debug1("Account %s locked out on %s", username, instance:GetName() ) table.insert( instance.ms_sql_brute.warnings, string.format( "%s: Account is locked out.", username ) ) if ( not stdnse.get_script_args( "ms-sql-brute.ignore-lockout" ) ) then stopInstance = true end end if ( mssql.LoginErrorMessage[ loginErrorCode ] == nil ) then stdnse.debug2("%s: Attemping login to %s as (%s/%s): Unknown login error number: %s", SCRIPT_NAME, instance:GetName(), username, password, loginErrorCode ) table.insert( instance.ms_sql_brute.warnings, string.format( "Unknown login error number: %s", loginErrorCode ) ) end stdnse.debug3("%s: Attempt to login to %s as (%s/%s): %d (%s)", SCRIPT_NAME, instance:GetName(), username, password, loginErrorCode, tostring( mssql.LoginErrorMessage[ loginErrorCode ] ) ) else table.insert( instance.ms_sql_brute.errors, string.format("Network error. Skipping instance. Error: %s", result ) ) stopUser = true stopInstance = true end if ( passwordIsGood ) then stopUser = true instance.ms_sql_brute.credentials[ username ] = { password, loginErrorCode } -- Add credentials for other ms-sql scripts to use but don't -- add accounts that need to change passwords if ( canLogin ) then instance.credentials[ username ] = password -- Legacy storage method (does not distinguish between instances) nmap.registry.mssqlusers = nmap.registry.mssqlusers or {} nmap.registry.mssqlusers[username]=password end end return stopUser, stopInstance end --- Processes a single instance, attempting to detect an empty password for "sa" local function process_instance( instance ) -- One of this script's features is that it will report an instance's -- in both the port-script results and the host-script results. In order to -- avoid redundant login attempts on an instance, we will just make the -- attempt once and then re-use the results. We'll use a mutex to make sure -- that multiple script instances (e.g. a host-script and a port-script) -- working on the same SQL Server instance can only enter this block one at -- a time. local mutex = nmap.mutex( instance ) mutex( "lock" ) -- If this instance has already been tested (e.g. if we got to it by both the -- hostrule and the portrule), don't test it again. if ( instance.tested_brute ~= true ) then instance.tested_brute = true instance.credentials = instance.credentials or {} instance.ms_sql_brute = instance.ms_sql_brute or {} instance.ms_sql_brute.credentials = instance.ms_sql_brute.credentials or {} instance.ms_sql_brute.warnings = instance.ms_sql_brute.warnings or {} instance.ms_sql_brute.errors = instance.ms_sql_brute.errors or {} local result, status local stopUser, stopInstance local usernames, passwords, username, password local helper = mssql.Helper:new() if ( not instance:HasNetworkProtocols() ) then stdnse.debug1("%s has no network protocols enabled.", instance:GetName() ) table.insert( instance.ms_sql_brute.errors, "No network protocols enabled." ) stopInstance = true end status, usernames = unpwdb.usernames() if ( not(status) ) then stdnse.debug1("Failed to load usernames list." ) table.insert( instance.ms_sql_brute.errors, "Failed to load usernames list." ) stopInstance = true end if ( status ) then status, passwords = unpwdb.passwords() if ( not(status) ) then stdnse.debug1("Failed to load passwords list." ) table.insert( instance.ms_sql_brute.errors, "Failed to load passwords list." ) stopInstance = true end end if ( status ) then for username in usernames do if stopInstance then break end -- See if the password is the same as the username (which may not -- be in the password list) stopUser, stopInstance = test_credentials( instance, helper, username, username ) for password in passwords do if stopUser then break end stopUser, stopInstance = test_credentials( instance, helper, username, password ) end passwords("reset") end end end -- The password testing has been finished. Unlock the mutex. mutex( "done" ) return create_instance_output_table( instance ) end action = function( host, port ) local scriptOutput = {} local status, instanceList = mssql.Helper.GetTargetInstances( host, port ) local domain, bruteWindows = stdnse.get_script_args("mssql.domain", "ms-sql-brute.brute-windows-accounts") if ( domain and not(bruteWindows) ) then local ret = "\n " .. "Windows authentication was enabled but the argument\n " .. "ms-sql-brute.brute-windows-accounts was not given. As there is currently no\n " .. "way of detecting accounts being locked out when Windows authentication is \n " .. "used, make sure that the amount entries in the password list\n " .. "(passdb argument) are at least 2 entries below the lockout threshold." return ret end if ( not status ) then return stdnse.format_output( false, instanceList ) else for _, instance in pairs( instanceList ) do local instanceOutput = process_instance( instance ) if instanceOutput then table.insert( scriptOutput, instanceOutput ) end end end return stdnse.format_output( true, scriptOutput ) end