CVE-2024-38095

.NET and Visual Studio Denial of Service Vulnerability

Microsoft Security Advisory CVE-2024-38095 | .NET Denial of Service Vulnerability

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

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 6.0 and .NET 8.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A Vulnerability exists when System.Formats.Asn1 in .NET parses an X.509 certificate or collection of certificates, a malicious certificate can result in excessive CPU consumption on all platforms result in Denial of Service.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/312

<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 6.0 application running on .NET 6.0.31 or earlier.
• Any .NET 8.0 application running on .NET 8.0.6 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 6"></a>.NET 6

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.NetCore.App.Runtime.linux-arm | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.linux-arm64 | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.linux-musl-arm | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.linux-musl-arm64 | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.linux-musl-x64 | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.linux-x64 | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.osx-arm64 | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.osx-x64 | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.win-arm | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.win-arm64 | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.win-x64 | >=6.0.0, <= 6.0.31 | 6.0.32 Microsoft.NetCore.App.Runtime.win-x86 | >=6.0.0, <= 6.0.31 | 6.0.32 System.Formats.Asn1 | >=5.0.0-preview.7.20364.11 | 6.0.1

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

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.NetCore.App.Runtime.linux-arm | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.NetCore.App.Runtime.linux-arm64 | >=8.0.0, <= 8.0.6 | 8.0.7 Microsoft.NetCore.App.Runtime.linux-musl-arm | >=8.0.0, <= 8.0.6 | 8.0.7…

.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 6.0.132 and Runtime 6.0.32.

Security Fix(es):

• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

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 Denial of Service 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 6.0.132 and Runtime 6.0.32.

Security Fix(es):

• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

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 6.0 to SDK 6.0.132 and Runtime 6.0.32.

Security Fix(es):

• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

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 8.0.107 and Runtime 8.0.7.

Security Fix(es):

• dotnet: DoS in System.Text.Json (CVE-2024-30105)
• dotnet: DoS in ASP.NET Core 8 (CVE-2024-35264)
• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

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 8.0.107 and Runtime 8.0.7.

Security Fix(es):

• dotnet: DoS in System.Text.Json (CVE-2024-30105)
• dotnet: DoS in ASP.NET Core 8 (CVE-2024-35264)
• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

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 Denial of Service Vulnerability

.NET and Visual Studio Denial of Service 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 8.0.107 and Runtime 8.0.7.

Security Fix(es):

• dotnet: DoS in System.Text.Json (CVE-2024-30105)

• dotnet: DoS in ASP.NET Core 8 (CVE-2024-35264)

• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

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 8.0.107 and Runtime 8.0.7.

Security Fix(es):

• dotnet: DoS in System.Text.Json (CVE-2024-30105)

• dotnet: DoS in ASP.NET Core 8 (CVE-2024-35264)

• dotnet: DoS when parsing X.509 Content and ObjectIdentifiers (CVE-2024-38095)

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.

It was discovered that .NET did not properly handle object deserialization. An attacker could possibly use this issue to cause a denial of service. (CVE-2024-30105)

Radek Zikmund discovered that .NET did not properly manage memory. An attacker could use this issue to cause a denial of service or possibly execute arbitrary code. (CVE-2024-35264)

It was discovered that .NET did not properly parse X.509 Content and ObjectIdentifiers. An attacker could possibly use this issue to cause a denial of service. (CVE-2024-38095)