module

Microsoft SharePoint Server-Side Include and ViewState RCE

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Disclosed
2020-10-13
Created
2020-10-19

Description

This module exploits a server-side include (SSI) in SharePoint to leak
the web.config file and forge a malicious ViewState with the extracted
validation key.

This exploit is authenticated and requires a user with page creation
privileges, which is a standard permission in SharePoint.

The web.config file will be stored in loot once retrieved, and the
VALIDATION_KEY option can be set to short-circuit the SSI and trigger
the ViewState deserialization.

Tested against SharePoint 2019 on Windows Server 2016.

Authors

mr_me
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_ssi_viewstate
    msf exploit(sharepoint_ssi_viewstate) > show targets
        ...targets...
    msf exploit(sharepoint_ssi_viewstate) > set TARGET < target-id >
    msf exploit(sharepoint_ssi_viewstate) > show options
        ...show and set options...
    msf exploit(sharepoint_ssi_viewstate) > exploit
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