CVE-2024-38167

Microsoft Security Advisory CVE-2024-38167 | .NET Information Disclosure Vulnerability

<a name="executive-summary"></a>Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A vulnerability exists in .NET runtime TlsStream which may result in Information Disclosure.

Discussion

Discussion for this issue can be found at https://github.com/dotnet/runtime/issues/106359

<a name="mitigation-factors"></a>Mitigation factors

Microsoft has not identified any mitigating factors for this vulnerability.

<a name="affected-software"></a>Affected software

• Any .NET 8.0 application running on .NET 8.0.7 or earlier.

<a name="affected-packages"></a>Affected Packages

The vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below

<a name=".NET 8"></a>.NET 8

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.NetCore.App.Runtime.linux-arm | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.linux-arm64 | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.linux-musl-arm | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.linux-musl-x64 | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.linux-x64 | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.osx-arm64 | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.osx-x64 | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.win-arm | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.win-arm64 | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.win-x64 | >= 8.0.0, < 8.0.8 | 8.0.8 Microsoft.NetCore.App.Runtime.win-x86 | >= 8.0.0, < 8.0.8 | 8.0.8

Advisory FAQ

<a name="how-affected"></a>How do I know if I am affected?

If you have a runtime or SDK with a version listed, or an affected package listed in affected software or affected packages, you're exposed to the vulnerability.

<a name="how-fix"></a>How do I fix the issue?

• To fix the issue please install the latest version of .NET 8.0 or .NET 6.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.
• If you have .NET 6.0 or greater installed, you can list the versions you have installed by running the dotnet --info command. You will see output like the following;

.NET Core SDK (reflecting any global.json):


 Version:   8.0.200
 Commit:    8473146e7d

Runtime Environment:

 OS Name:     Windows
 OS Version:  10.0.18363
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program…

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.108 and .NET Runtime 8.0.8.

Security Fix(es):

• dotnet: Information disclosure vulnerability in TlsStream (CVE-2024-38167)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.Security Fix(es):

• EMBARGOED CVE-2024-38167 dotnet8.0: Information disclosure vulnerability in TlsStream (CVE-2024-38167)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET and Visual Studio Information Disclosure Vulnerability

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.108 and .NET Runtime 8.0.8.

Security Fix(es):

• dotnet: Information disclosure vulnerability in TlsStream (CVE-2024-38167)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.Security Fix(es):

• EMBARGOED CVE-2024-38167 dotnet8.0: Information disclosure vulnerability in TlsStream (CVE-2024-38167)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.108 and .NET Runtime 8.0.8.

Security Fix(es):

• dotnet: Information disclosure vulnerability in TlsStream (CVE-2024-38167)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.Security Fix(es):

• EMBARGOED CVE-2024-38167 dotnet8.0: Information disclosure vulnerability in TlsStream (CVE-2024-38167)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

.NET and Visual Studio Information Disclosure Vulnerability

.NET and Visual Studio Information Disclosure Vulnerability

It was discovered that .NET suffered from an information disclosure vulnerability. An attacker could potentially use this issue to read targeted email messages.