Vulnerability identifier: #VU29836

Vulnerability risk: High

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2020-1147

CWE-ID: CWE-91

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Microsoft SharePoint Server
Server applications / Application servers
Visual Studio
Universal components / Libraries / Software for developers
ASP.NET Core MVC
Universal components / Libraries / Software for developers
Microsoft .NET Core
Server applications / Frameworks for developing and running applications
Microsoft .NET Framework
Server applications / Frameworks for developing and running applications

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation when processing XML data in .NET Framework, Microsoft SharePoint, and Visual Studio. A remote unauthenticated attacker can pass specially crafted XML data to the application and execute arbitrary code on the system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft SharePoint Server: 2010 - 2019

Visual Studio: 16.0.0 16.0.28729.10, 16.6.0 16.6.30114.105, 15.9, 16.4.0 16.4.29519.181

ASP.NET Core MVC: 2.1.0

Microsoft .NET Core: 3.1

Microsoft .NET Framework: 4.6, 4.8, 2.0, 3.0, 3.5, 3.5.1, 4.5.2

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1147

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.