CVE-2020-1595 Microsoft SharePoint Remote Code Execution Vulnerability

Critical 9.9 Published 11 Sep 2020 Updated 18 Nov 2024

An attacker can execute arbitrary code by sending specially formatted input to a SharePoint API, requiring user interaction to access the endpoint.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-1595?

CVE-2020-1595 is a critical unsafe deserialization vulnerability in Microsoft Sharepoint Enterprise Server, published on 11 Sep 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A remote code execution vulnerability exists in Microsoft SharePoint where APIs aren't properly protected from unsafe data input. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account. Exploitation of this vulnerability requires that a user access a susceptible API on an affected version of SharePoint with specially-formatted input. The security update addresses the vulnerability by correcting how SharePoint handles deserialization of untrusted data.

Weakness: CWE-494

Which versions are affected by CVE-2020-1595?

It affects 3 products.

Products include Microsoft Sharepoint Enterprise Server, Microsoft Sharepoint Foundation, Microsoft Sharepoint Server.

How do I fix CVE-2020-1595?

No fix has been published for CVE-2020-1595 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2020-1595 being exploited?

There is no known exploitation of CVE-2020-1595 in the wild and no public exploit code.

All Microsoft Sharepoint Enterprise Server vulnerabilities

Sources

Also known as GHSA-85x5-vr9q-4m59.