module

Microsoft SharePoint Server-Side Include and ViewState RCE

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Disclosed
Oct 13, 2020
Created
Oct 19, 2020

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 [email protected]

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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