CVE-2020-1147

critical KEV

Published 2022-05-24 · Modified 2021-11-03

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CVSS v3

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CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H

CVSS v4 NEW

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not yet in upstream

VIR risk

10.0

Description

Microsoft .NET Framework, Microsoft SharePoint, and Visual Studio contain a remote code execution vulnerability when the software fails to check the source markup of XML file input. Successful exploitation allows an attacker to execute code in the context of the process responsible for deserialization of the XML content.

CISA KEV

Vendor: Microsoft
Product: .NET Framework, SharePoint, Visual Studio
Due date: 2022-05-03

Predictions

Exploit likelihood

99%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-50151 webapps aspx

Podalirius · 2021-07-23

Microsoft SharePoint Server 2019 - Remote Code Execution (2)

Source code queued for fetch — refresh in a moment.

EDB-48747 webapps aspx

West Shepherd · 2020-08-17

Microsoft SharePoint Server 2019 - Remote Code Execution

Source code queued for fetch — refresh in a moment.

Metasploit modules

exploit_windows/http/sharepoint_data_deserialization rank 600

SharePoint DataSet / DataTable Deserialization

Source fetch failed: fetch_error — view the original via the link above.

OS impact

Red Hat Fixed 1 release

Version	Status	Fixed in
8	Fixed	—

Package impact

Ecosystem	Package	Vulnerable	Fixed
NuGet	Microsoft.NETCore.App	`>=2.1.0,<2.1.20`	`2.1.20`
NuGet	Microsoft.NETCore.App.Runtime.linux-arm	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.linux-arm64	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.linux-musl-arm64	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.linux-musl-x64	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.linux-x64	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.osx-x64	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.rhel.6-x64	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.win-arm	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.win-arm64	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.win-x64	`>=3.1.0,<3.1.6`	`3.1.6`
NuGet	Microsoft.NETCore.App.Runtime.win-x86	`>=3.1.0,<3.1.6`	`3.1.6`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.