What is the severity of ZDI-21-828?

The severity of ZDI-21-828 is classified as critical due to its potential to allow remote code execution.

How do I fix ZDI-21-828?

To fix ZDI-21-828, apply the latest security updates from Microsoft for SharePoint.

Which versions of Microsoft SharePoint are affected by ZDI-21-828?

ZDI-21-828 affects various versions of Microsoft SharePoint that include the specific flaw in the WorkflowActions.SetVariableActivity class.

Is authentication required to exploit ZDI-21-828?

Yes, authentication is required to exploit the ZDI-21-828 vulnerability.

What is the potential impact of ZDI-21-828?

The potential impact of ZDI-21-828 includes unauthorized remote code execution on affected SharePoint installations.

Vulnerability/
ZDI-21-828

high

8.8

16/1/2024

ZDI-21-828: Microsoft SharePoint SetVariableActivity Deserialization of Untrusted Data Remote Code Execution Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft SharePoint. Authentication is required to exploit this vulnerability. The specific flaw exists within the Microsoft.SharePoint.WorkflowActions.SetVariableActivity class. A crafted SetVariableActivity element can result in instantiation of an arbitrary .NET type. An attacker can leverage this vulnerability to execute code in the context of the web service account.

Affected Software	Affected Version	How to fix

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Frequently Asked Questions

What is the severity of ZDI-21-828?
The severity of ZDI-21-828 is classified as critical due to its potential to allow remote code execution.
How do I fix ZDI-21-828?
To fix ZDI-21-828, apply the latest security updates from Microsoft for SharePoint.
Which versions of Microsoft SharePoint are affected by ZDI-21-828?
ZDI-21-828 affects various versions of Microsoft SharePoint that include the specific flaw in the WorkflowActions.SetVariableActivity class.
Is authentication required to exploit ZDI-21-828?
Yes, authentication is required to exploit the ZDI-21-828 vulnerability.
What is the potential impact of ZDI-21-828?
The potential impact of ZDI-21-828 includes unauthorized remote code execution on affected SharePoint installations.

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agent/severity
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source/ZDI
alias/ZDI-21-828
alias/ZDI-CAN-13358
alias/CVE-2021-34520
agent/software-canonical-lookup
agent/tags
agent/event
agent/source
vendor/microsoft
canonical/microsoft sharepoint

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Frequently Asked Questions

What is the severity of ZDI-21-828?
The severity of ZDI-21-828 is classified as critical due to its potential to allow remote code execution.
How do I fix ZDI-21-828?
To fix ZDI-21-828, apply the latest security updates from Microsoft for SharePoint.
Which versions of Microsoft SharePoint are affected by ZDI-21-828?
ZDI-21-828 affects various versions of Microsoft SharePoint that include the specific flaw in the WorkflowActions.SetVariableActivity class.
Is authentication required to exploit ZDI-21-828?
Yes, authentication is required to exploit the ZDI-21-828 vulnerability.
What is the potential impact of ZDI-21-828?
The potential impact of ZDI-21-828 includes unauthorized remote code execution on affected SharePoint installations.