CVE-2020-1147 Microsoft .NET Framework, SharePoint, Visual Studio: command or code injection
In plain words: The program treats text it receives as instructions instead of plain data. The attacker can run commands on the machine — often the whole device is taken over.
Confirmed exploited by CISA on · US federal patch deadline May 3, 2022
What to do
- Install Microsoft's security update for .NET Framework, SharePoint, Visual Studio. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Microsoft .NET Framework, SharePoint, and Visual Studio Remote Code Execution Vulnerability
- Product
- Microsoft .NET Framework, SharePoint, Visual Studio
- CISA 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.
- Type of flaw
- Command or code injection
- Confirmed exploited
- Nov 3, 2021
- US federal patch deadline
- May 3, 2022
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Answering about CVE-2020-1147 ·
Questions about CVE-2020-1147
Is CVE-2020-1147 being exploited?
Yes. CISA added CVE-2020-1147 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2020-1147?
Install Microsoft's security update for .NET Framework, SharePoint, Visual Studio. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2020-1147?
Only if you use Microsoft .NET Framework, SharePoint, Visual Studio. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.