Microsoft Security Advisory CVE-2023-35391: .NET Information Disclosure Vulnerability

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 7.0.9"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.SignalR.StackExchangeRedis"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.0.20"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.SignalR.StackExchangeRedis"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.0.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.SignalR.Redis"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.40"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-35391"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-08-11T20:54:45Z",
    "nvd_published_at": "2023-08-08T19:15:09Z",
    "severity": "HIGH"
  },
  "details": "# Microsoft Security Advisory CVE-2023-35391: .NET Information Disclosure Vulnerability\n\n## \u003ca name=\"executive-summary\"\u003e\u003c/a\u003eExecutive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET core 2.1, .NET 6.0 and, .NET 7.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.\n\nA vulnerability exists in ASP.NET Core 2.1, .NET 6.0 and, .NET 7.0 applications using SignalR when redis backplane use might result in information disclosure.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/267\n\n### \u003ca name=\"mitigation-factors\"\u003e\u003c/a\u003eMitigation factors\n\nMicrosoft has not identified any mitigating factors for this vulnerability.\n\n## \u003ca name=\"affected-software\"\u003e\u003c/a\u003eAffected software\n\n* Any .NET 7.0 application running on .NET 7.0.9 or earlier.\n* Any .NET 6.0 application running on .NET 6.0.20 or earlier.\n\nIf your application uses the following package versions, ensure you update to the latest version of .NET.\n\n### \u003ca name=\".NET 7\"\u003e\u003c/a\u003e.NET 7\n\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.SignalR.StackExchangeRedis](https://www.nuget.org/packages/Microsoft.AspNetCore.SignalR.StackExchangeRedis)      | \u003e= 7.0.0, \u003c= 7.0.9 | 7.0.10\n\n\n### \u003ca name=\".NET 6\"\u003e\u003c/a\u003e.NET 6\n\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.SignalR.StackExchangeRedis](https://www.nuget.org/packages/Microsoft.AspNetCore.SignalR.StackExchangeRedis)        | \u003e= 6.0.0, \u003c= 6.0.20 | 6.0.21\n\n### \u003ca name=\"ASP.NET Core 2.1\"\u003e\u003c/a\u003eASP.NET Core 2.1\n\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.SignalR.Redis](https://www.nuget.org/packages/Microsoft.AspNetCore.SignalR.Redis)      | \u003c 1.0.40 | 1.0.40\n\n## Advisory FAQ\n\n### \u003ca name=\"how-affected\"\u003e\u003c/a\u003eHow do I know if I am affected?\n\nIf you have a runtime or SDK with a version listed, or an affected package listed in [affected software](#affected-software), you\u0027re exposed to the vulnerability.\n\n### \u003ca name=\"how-fix\"\u003e\u003c/a\u003eHow do I fix the issue?\n\n* To fix the issue please install the latest version of .NET 6.0 or .NET 7.0. 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.\n* If you are using one of the affected packages, please update to the patched version listed above.\n* 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;\n\n```\n.NET Core SDK (reflecting any global.json):\n\n Version:   6.0.300\n Commit:    8473146e7d\n\nRuntime Environment:\n\n OS Name:     Windows\n OS Version:  10.0.18363\n OS Platform: Windows\n RID:         win10-x64\n Base Path:   C:\\Program Files\\dotnet\\sdk\\6.0.300\\\n\nHost (useful for support):\n\n  Version: 6.0.5\n  Commit:  8473146e7d\n\n.NET Core SDKs installed:\n\n  6.0.300 [C:\\Program Files\\dotnet\\sdk]\n\n.NET Core runtimes installed:\n\n  Microsoft.AspNetCore.App 6.0.5 [C:\\Program Files\\dotnet\\shared\\Microsoft.AspNetCore.App]\n  Microsoft.NETCore.App 6.0.5 [C:\\Program Files\\dotnet\\shared\\Microsoft.NETCore.App]\n  Microsoft.WindowsDesktop.App 6.0.5 [C:\\Program Files\\dotnet\\shared\\Microsoft.WindowsDesktop.App]\n\nTo install additional .NET Core runtimes or SDKs:\n  https://aka.ms/dotnet-download\n```\n\n* If you\u0027re using .NET 7.0, you should download and install Runtime 7.0.10 or SDK 7.0.110 (for Visual Studio 2022 v17.4) from https://dotnet.microsoft.com/download/dotnet-core/7.0.\n* If you\u0027re using .NET 6.0, you should download and install Runtime 6.0.21 or SDK 6.0.316 (for Visual Studio 2022 v17.2) from https://dotnet.microsoft.com/download/dotnet-core/6.0.\n\n.NET 6.0 and and .NET 7.0 updates are also available from Microsoft Update. To access this either type \"Check for updates\" in your Windows search, or open Settings, choose Update \u0026 Security and then click Check for Updates.\n\nOnce you have installed the updated runtime or SDK, restart your apps for the update to take effect.\n\nAdditionally, if you\u0027ve deployed [self-contained applications](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf you have found a potential security issue in .NET 6.0 or .NET 7.0, please email details to secure@microsoft.com. Reports may qualify for the Microsoft .NET Core \u0026 .NET 5 Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at \u003chttps://aka.ms/corebounty\u003e.\n\n### Support\n\nYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime and https://github.com/dotnet/aspnet/. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n\n### External Links\n\n[CVE-2023-35391]( https://www.cve.org/CVERecord?id=CVE-2023-35391)\n\n### Revisions\n\nV1.0 (August 08, 2023): Advisory published.\n\n_Version 1.0_\n\n_Last Updated 2023-08-08_",
  "id": "GHSA-j8rm-cm55-qqj6",
  "modified": "2023-08-11T20:54:45Z",
  "published": "2023-08-11T20:54:45Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/aspnetcore/security/advisories/GHSA-j8rm-cm55-qqj6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-35391"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/announcements/issues/267"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dotnet/aspnetcore"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35391"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": ".NET Information Disclosure Vulnerability"
}