module

Microsoft SharePoint Unsafe Control and ViewState RCE

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Disclosed
2021-05-11
Created
2021-06-16

Description

The EditingPageParser.VerifyControlOnSafeList method fails to properly validate user supplied data. This
can be leveraged by an attacker to leak sensitive information in rendered-preview content. This module will
leak the ViewState validation key and then use it to sign a crafted object that will trigger code execution
when deserialized.

Tested against SharePoint 2019 and SharePoint 2016, both on Windows Server 2016.

Authors

Unknown
Spencer McIntyre
wvu wvu@metasploit.com

Platform

Windows

Architectures

cmd, x86, x64

References

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/sharepoint_unsafe_control
    msf exploit(sharepoint_unsafe_control) > show targets
        ...targets...
    msf exploit(sharepoint_unsafe_control) > set TARGET < target-id >
    msf exploit(sharepoint_unsafe_control) > show options
        ...show and set options...
    msf exploit(sharepoint_unsafe_control) > exploit
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