CVE-2021-34485

MEDIUM

.NET Core Information Disclosure Vulnerability

Published October 20, 2022Updated December 6, 2024Source: osv

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. An information disclosure vulnerability exists in .NET 5.0, .NET Core 3.1 and .NET Core 2.1 when dumps created by the tool to collect crash dumps and dumps on demand are created with global read permissions on Linux and macOS. ### Patches * If you're using .NET 5.0, you should download and install Runtime 5.0.9 or SDK 5.0.206 (for Visual Studio 2019 v16.8) or SDK 5.0.303 (for Visual Studio 2019 V16.10) from https://dotnet.microsoft.com/download/dotnet-core/5.0. * If you're using .NET Core 3.1, you should download and install Runtime 3.1.18 or SDK 3.1.118 (for Visual Studio 2019 v16.4) or 3.1.412 (for Visual Studio 2019 v16.7 or later) from https://dotnet.microsoft.com/download/dotnet-core/3.1. * If you're using .NET Core 2.1, you should download and install Runtime 2.1.29 or SDK 2.1.525 (for Visual Studio 2019 v15.9) or 2.1.817 from https://dotnet.microsoft.com/download/dotnet-core/2.1. #### Other Details - Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/196 - An Issue for this can be found at https://github.com/dotnet/runtime/issues/57174 - MSRC details for this can be found at https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-34485

Remediation

Upgrade to the fixed version using your package manager.

NuGet

Update Microsoft.NETCore.App.Runtime.linux-arm64 to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-arm64 --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.linux-arm64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.linux-arm64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.linux-arm to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.linux-arm --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.linux-musl-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.linux-arm to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-arm --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.osx-x64 to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.osx-x64 --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.win-arm to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.win-arm --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.linux-musl-x64 to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-x64 --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.linux-musl-arm to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.win-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.win-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.win-x64 to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.win-x64 --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.linux-musl-arm64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.win-arm64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.win-arm64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.win-x86 to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.win-x86 --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.linux-x64 to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-x64 --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.linux-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.linux-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.linux-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.linux-musl-arm64 to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm64 --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.win-arm64 to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.win-arm64 --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.linux-arm to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-arm --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.rhel.6-x64 to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.rhel.6-x64 --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.win-x86 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.win-x86 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.osx-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.osx-x64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.linux-arm64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.linux-arm64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App.Runtime.win-arm to 3.1.18 or later

dotnet add package Microsoft.NETCore.App.Runtime.win-arm --version 3.1.18

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64 --version 5.0.9

NuGet

Update Microsoft.NETCore.App to 2.1.29 or later

dotnet add package Microsoft.NETCore.App --version 2.1.29

NuGet

Update Microsoft.NETCore.App.Runtime.Mono.osx-x64 to 5.0.9 or later

dotnet add package Microsoft.NETCore.App.Runtime.Mono.osx-x64 --version 5.0.9

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (34)

Package	Ecosystem	Affected	Fixed In
Microsoft.NETCore.App.Runtime.linux-arm64	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.Mono.linux-arm64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.Mono.linux-arm	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.linux-musl-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.linux-arm	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.osx-x64	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.win-arm	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.linux-musl-x64	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.linux-musl-arm	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.win-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.win-x64	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.linux-musl-arm64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.win-arm64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.win-x86	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.linux-x64	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.Mono.linux-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.linux-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.linux-musl-arm64	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.win-arm64	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.linux-arm	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.rhel.6-x64	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.win-x86	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.osx-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.linux-arm64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App.Runtime.win-arm	nuget	3.1.0, 3.1.1, 3.1.10, 3.1.11 (+14 more)	3.1.18
Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9
Microsoft.NETCore.App	nuget	2.1.0, 2.1.1, 2.1.10, 2.1.11 (+25 more)	2.1.29
Microsoft.NETCore.App.Runtime.Mono.osx-x64	nuget	5.0.0, 5.0.1, 5.0.2, 5.0.3 (+5 more)	5.0.9

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.5 score means for each attack dimension.

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

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

References

Frequently Asked Questions

What is CVE-2021-34485?: .NET Core Information Disclosure Vulnerability This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.5/10).
How do I check if my project is affected by CVE-2021-34485?: CVE-2021-34485 affects Microsoft.NETCore.App.Runtime.linux-arm64, Microsoft.NETCore.App.Runtime.Mono.linux-arm64 and Microsoft.NETCore.App.Runtime.Mono.linux-arm (and 21 more). Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-34485 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

5.5

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-vgwq-hfqc-58wv

BIT-dotnet-2021-34485

BIT-dotnet-sdk-2021-34485

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