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Microsoft SQL Server Clr Stored Procedure Payload Execution

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Microsoft SQL Server Clr Stored Procedure Payload Execution

Disclosed
01/01/1999
Created
05/30/2018

Description

This module executes an arbitrary native payload on a Microsoft SQL server by loading a custom SQL CLR Assembly into the target SQL installation, and calling it directly with a base64-encoded payload. The module requires working credentials in order to connect directly to the MSSQL Server. This method requires the user to have sufficient privileges to install a custom SQL CRL DLL, and invoke the custom stored procedure that comes with it. This exploit does not leave any binaries on disk. Tested on MS SQL Server versions: 2005, 2012, 2016 (all x64).

Author(s)

  • Lee Christensen
  • Nathan Kirk
  • OJ Reeves

Platform

Windows

Architectures

x86, x64

Development

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/windows/mssql/mssql_clr_payload
msf exploit(mssql_clr_payload) > show targets
    ...targets...
msf exploit(mssql_clr_payload) > set TARGET < target-id >
msf exploit(mssql_clr_payload) > show options
    ...show and set options...
msf exploit(mssql_clr_payload) > exploit

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