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Plesk/myLittleAdmin ViewState .NET Deserialization

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Plesk/myLittleAdmin ViewState .NET Deserialization

Disclosed
05/15/2020
Created
05/22/2020

Description

This module exploits a ViewState .NET deserialization vulnerability in web-based MS SQL Server management tool myLittleAdmin, for version 3.8 and likely older versions, due to hardcoded parameters in the web.config file for ASP.NET. Popular web hosting control panel Plesk offers myLittleAdmin as an optional component that is selected automatically during "full" installation. This exploit caters to the Plesk target, though it should work fine against a standalone myLittleAdmin setup. Successful exploitation results in code execution as the user running myLittleAdmin, which is IUSRPLESK_sqladmin for Plesk and described as the "SQL Admin MSSQL anonymous account." Tested on the latest Plesk Obsidian with optional myLittleAdmin 3.8.

Author(s)

  • Spencer McIntyre
  • wvu <wvu@metasploit.com>

Platform

Windows

Architectures

cmd, 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/http/plesk_mylittleadmin_viewstate
msf exploit(plesk_mylittleadmin_viewstate) > show targets
    ...targets...
msf exploit(plesk_mylittleadmin_viewstate) > set TARGET < target-id >
msf exploit(plesk_mylittleadmin_viewstate) > show options
    ...show and set options...
msf exploit(plesk_mylittleadmin_viewstate) > exploit

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