Affected: AlmaLinux:9: aspnetcore-runtime-8.0, AlmaLinux:9: aspnetcore-targeting-pack-8.0, AlmaLinux:9: dotnet-apphost-pack-8.0, AlmaLinux:9: dotnet-host, AlmaLinux:9: dotnet-hostfxr-8.0, AlmaLinux:9: dotnet-runtime-8.0, AlmaLinux:9: dotnet-sdk-8.0, AlmaLinux:9: dotnet-sdk-8.0-source-built-artifacts, AlmaLinux:9: dotnet-targeting-pack-8.0, AlmaLinux:9: dotnet-templates-8.0 and 1 more

.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.

Security Fix(es):

* dotnet: Arbitrary File Write and Deletion Vulnerability: FormatFtpCommand (CVE-2023-36049) * dotnet: ASP.NET Security Feature Bypass Vulnerability in Blazor forms (CVE-2023-36558)

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.

Affected: Bitnami: dotnet

.NET, .NET Framework, and Visual Studio Elevation of Privilege Vulnerability

Affected: CleanStart: dotnet6-build, CleanStart: dotnet6-runtime

CVE-2023-36049 affects multiple packages. . See references for individual vulnerability details.

.NET, .NET Framework, and Visual Studio Elevation of Privilege Vulnerability

Affected: NuGet: System.Net.Requests

# Microsoft Security Advisory CVE-2023-36049: .NET Elevation of Privilege Vulnerability

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

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 6.0, .NET 7.0 and .NET 8.0 RC2. This advisory also provides guidance on what developers can do to update their applications to address this vulnerability.

An elevation of privilege vulnerability exists in .NET where untrusted URIs provided to System.Net.WebRequest.Create can be used to inject arbitrary commands to backend FTP servers.

## Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/287

### <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 6.0.24 or earlier. * Any .NET 7.0 application running on .NET 7.0.13 or earlier. * Any .NET 8.0 application running on .NET 8.0 RC2.

## 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](#affected-software), 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 7.0 or .NET 6.0. If you have installed one or more .NET SDKs through…

An issue was discovered in libxml2 before 2.10.3. When parsing a multi-gigabyte XML document with the XML_PARSE_HUGE parser option enabled, several integer counters can overflow. This results in an attempt to access an array at a negative 2GB offset, typically leading to a segmentation fault. An issue was discovered in libxml2 before 2.10.3. Certain invalid XML entity definitions can corrupt a hash table key, potentially leading to subsequent logic errors. In one case, a double-free can be provoked. A security vulnerability has been identified in all supported versions of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems. Policy processing is disabled by default but can be enabled by passing the `-policy` argument to the command line utilities or by calling the `X509_VERIFY_PARAM_set1_policies()` function. Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent…

dotnet: Arbitrary File Write and Deletion Vulnerability: FormatFtpCommand dotnet: ASP.NET Security Feature Bypass Vulnerability in Blazor forms

dotnet: Arbitrary File Write and Deletion Vulnerability: FormatFtpCommand dotnet: ASP.NET Security Feature Bypass Vulnerability in Blazor forms

Affected: Ubuntu:22.04:LTS: dotnet6, Ubuntu:22.04:LTS: dotnet7

.NET, .NET Framework, and Visual Studio Elevation of Privilege Vulnerability

Ein entfernter Angreifer kann mehrere Schwachstellen in Microsoft .NET Framework, Microsoft ASP.NET, Microsoft Visual Studio und Microsoft Visual Studio Code ausnutzen, um Sicherheitsmechanismen zu umgehen, um seine Privilegien zu erhöhen und um einen Denial of Service Zustand herbeizuführen.