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Fencer Intel
high 7.8

CVE-2020-1147 kev in the critical feed json

.NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability

published 6y ago modified 4mo ago also GHSA-g5vf-38cp-4px9 , EUVD-2022-3898

cvss
7.8
version 3.1, CNA
cisa kev
Exploited
added 2021-11-03
epss
95.8%
EPSS 95.8% chance of exploitation in 30 days, percentile 99.8%
public exploits
3
Metasploit and Exploit-DB

Summary

A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and Visual Studio when the software fails to check the source markup of XML file input, aka '.NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability'.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • nuget Microsoft.NETCore.App 2.1.20
  • nuget Microsoft.NETCore.App.Runtime.linux-arm 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.linux-arm64 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-x64 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.linux-x64 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.osx-x64 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.rhel.6-x64 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.win-arm 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.win-arm64 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.win-x64 3.1.6
  • nuget Microsoft.NETCore.App.Runtime.win-x86 3.1.6
  • dotnet RHEL 8 3.1.106-1.el8_2
  • dotnet3.1 RHEL 8 3.1.106-1.el8_2
  • dotnet-host RHEL 8 3.1.6-1.el8_2
  • dotnet-sdk-3.1 RHEL 8 3.1.106-1.el8_2
  • dotnet-hostfxr-3.1 RHEL 8 3.1.6-1.el8_2
  • dotnet-runtime-3.1 RHEL 8 3.1.6-1.el8_2
  • dotnet-templates-3.1 RHEL 8 3.1.106-1.el8_2
  • aspnetcore-runtime-3.1 RHEL 8 3.1.6-1.el8_2

red hat advisories RHSA-2020:2988RHSA-2020:2954RHSA-2020:2939RHSA-2020:2937RHSA-2020:2938RHSA-2020:2989

Is CVE-2020-1147 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-1147 updated cvss 8.8

dotnet: XML source markup processing remote code execution

  • Red Hat .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet21 2.1-19.el7, rh-dotnet21-runtime 2.1-19.el7, rh-dotnet21-dotnet 2.1.516-1.el7, rh-dotnet31-dotnet 3.1.106-1.el7, rh-dotnet31-dotnet-host 3.1.6-1.el7, rh-dotnet21-dotnet-host 2.1.20-1.el7, +12 more Red Hat .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet21 2.1-19.el7, rh-dotnet21-runtime 2.1-19.el7, rh-dotnet21-dotnet 2.1.516-1.el7, rh-dotnet31-dotnet 3.1.106-1.el7, rh-dotnet31-dotnet-host 3.1.6-1.el7, rh-dotnet21-dotnet-host 2.1.20-1.el7, +12 more Red Hat .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet21 2.1-19.el7, rh-dotnet21-runtime 2.1-19.el7, rh-dotnet21-dotnet 2.1.516-1.el7, rh-dotnet31-dotnet 3.1.106-1.el7, rh-dotnet31-dotnet-host 3.1.6-1.el7, rh-dotnet21-dotnet-host 2.1.20-1.el7, +12 more
    fixed: vendor fix RHSA-2020:2937
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 2.1.516-1.el8_2, dotnet 3.1.106-1.el8_2, dotnet-host 3.1.6-1.el8_2, dotnet3.1 3.1.106-1.el8_2, dotnet-sdk-2.1 2.1.516-1.el8_2, dotnet-sdk-3.1 3.1.106-1.el8_2, +11 more
    fixed: vendor fix RHSA-2020:2954
  • Red Hat Enterprise Linux AppStream E4S (v. 8.0) dotnet 2.1.516-1.el8_0, dotnet-host 2.1.20-1.el8_0, dotnet-sdk-2.1 2.1.516-1.el8_0, dotnet-runtime-2.1 2.1.20-1.el8_0, dotnet-host-fxr-2.1 2.1.20-1.el8_0, dotnet-sdk-2.1.5xx 2.1.516-1.el8_0
    fixed: vendor fix RHSA-2020:2989
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) dotnet 2.1.516-1.el8_1, dotnet-sdk-2.1 2.1.516-1.el8_1, dotnet-runtime-2.1 2.1.20-1.el8_1, dotnet-host-fxr-2.1 2.1.20-1.el8_1, dotnet-sdk-2.1.5xx 2.1.516-1.el8_1
    fixed: vendor fix RHSA-2020:2988

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (Metasploit exploit/windows/http/sharepoint_data_deserialization)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
5y ago
Patch by
2022-05-03 (4y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Microsoft, .NET Framework, SharePoint, Visual Studio
CISA name
Microsoft .NET Framework, SharePoint, and Visual Studio Remote Code Execution Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

95.80% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Metasploit exploit/windows/http/sharepoint_data_deserialization SharePoint DataSet / DataTable Deserialization metasploit exploit, excellent rank, 2020-07-14
  • EDB-50151 Microsoft SharePoint Server 2019 - Remote Code Execution (2) webapps, 2021-07-23
  • EDB-48747 Microsoft SharePoint Server 2019 - Remote Code Execution webapps, 2020-08-17
  • packetstormsecurity.com http://packetstormsecurity.com/files/158694/SharePoint-DataSet-DataTable-Deserialization.html referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/158876/Microsoft-SharePoint-Server-2019-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified
  • exploitalert.com https://www.exploitalert.com/view-details.html?id=35992 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/163644/Microsoft-SharePoint-Server-2019-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H

Affected packages

ecosystem package affected fixed in
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

Affected products

  • Microsoft Microsoft SharePoint Enterprise Server
  • Microsoft Microsoft SharePoint Server
  • Microsoft Microsoft Visual Studio 2019
  • Microsoft Microsoft Visual Studio 2019 version 16.6 (includes 16.0 - 16.5)
  • Microsoft Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)
  • Microsoft Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)
  • Microsoft .NET Core
  • Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2
  • Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems
  • Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems
  • Microsoft Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation)
  • Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems
  • Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems
  • Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems
  • Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
  • Microsoft Microsoft .NET Framework 4.8 on Windows Server 2016
  • Microsoft Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
  • Microsoft Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1
  • Microsoft Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1
  • Microsoft Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems
  • Microsoft Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems
  • Microsoft Microsoft .NET Framework 4.8 on Windows RT 8.1
  • Microsoft Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Microsoft Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Microsoft Microsoft .NET Framework 4.8 on Windows Server 2012
  • Microsoft Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)
  • Microsoft Microsoft .NET Framework 4.8 on Windows Server 2012 R2
  • Microsoft Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation)
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation)
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32-bit Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server, version 1803 (Server Core Installation)
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation)
  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems
  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016
  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation)

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.