.NET Core Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-24112.
Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 5.0, .NET Core 3.1, and .NET Core 2.1. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
A remote code execution vulnerability exists in .NET 5 and .NET Core due to how text encoding is performed.
Discussion
Discussion for this issue can be found at dotnet/runtime#49377
Mitigation factors
Microsoft has not identified any mitigating factors for this vulnerability.
Affected software
The vulnerable package is System.Text.Encodings.Web . Upgrading your package and redeploying your app should be sufficient to address this vulnerability.
Vulnerable package versions:
Any .NET 5, .NET Core, or .NET Framework based application that uses the System.Text.Encodings.Web package with a vulnerable version listed below.
| Package Name | Vulnerable Versions | Secure Versions |
|---|---|---|
| System.Text.Encodings.Web | 4.0.0 - 4.5.0 | 4.5.1 |
| System.Text.Encodings.Web | 4.6.0-4.7.1 | 4.7.2 |
| System.Text.Encodings.Web | 5.0.0 | 5.0.1 |
Please validate that each of the .NET versions you are using is in support. Security updates are only provided for supported .NET versions.
References:- https://nvd.nist.gov/vuln/detail/CVE-2021-26701
- https://github.com/dotnet/announcements/issues/178
- https://lists.fedoraproject.org/archives/list/[email protected]/message/S2AZOUKMCHT2WBHR7MYDTYXWOBHZW5P5/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/TW3ZSJTTMZAFKGW7NJWTVVFZUYYU2SJZ/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/UBOSSX7U6BSHV5RI74FCOW4ITJ5RRJR5/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/WA5WQJVHUL5C4XMJTLY3C67R4WP35EF4/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/XPUKFHIGP5YNJRRFWKDJ2XRS4WTFJNNK/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/YLFATXASXW4OV2ZBSRP4G55HJH73QPBP/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26701
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S2AZOUKMCHT2WBHR7MYDTYXWOBHZW5P5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TW3ZSJTTMZAFKGW7NJWTVVFZUYYU2SJZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBOSSX7U6BSHV5RI74FCOW4ITJ5RRJR5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WA5WQJVHUL5C4XMJTLY3C67R4WP35EF4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XPUKFHIGP5YNJRRFWKDJ2XRS4WTFJNNK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YLFATXASXW4OV2ZBSRP4G55HJH73QPBP/
- https://github.com/advisories/GHSA-ghhp-997w-qr28