CVE-2023-38171: Microsoft.Native.Quic.MsQuic.Schannel Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-xh5m-8qqp-c5x7
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CVSS 7.5
CWE-400 CWE-476
Published
Advisory Summary

CVE-2023-38171 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Microsoft.Native.Quic.MsQuic.Schannel libraries in the NuGet ecosystem. The issue involves remote denial of service vulnerability in microsoft.native.quic.msquic.schannel. Remediation is available by upgrading affected packages to version 2.2.3.

CVE-2023-38171 at a Glance

CVE Identifier CVE-2023-38171
GHSA Identifier GHSA-xh5m-8qqp-c5x7
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Microsoft.Native.Quic.MsQuic.Schannel
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2023-38171

To remediate this vulnerability, upgrade all affected Microsoft.Native.Quic.MsQuic.Schannel dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Microsoft.Native.Quic.MsQuic.Schannel fixed: 2.2.3 
Upgrade Microsoft.Native.Quic.MsQuic.Schannel to 2.2.3
Microsoft.Native.Quic.MsQuic.OpenSSL fixed: 2.2.3 
Upgrade Microsoft.Native.Quic.MsQuic.OpenSSL to 2.2.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for Microsoft.Native.Quic.MsQuic.Schannel

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-38171, inspect your project dependencies for Microsoft.Native.Quic.MsQuic.Schannel:

inspect dependencies for Microsoft.Native.Quic.MsQuic.Schannel

Analyze the terminal output to locate any version of Microsoft.Native.Quic.MsQuic.Schannel in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.3), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Microsoft.Native.Quic.MsQuic.Schannel, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact The MsQuic server application or process will crash, resulting in a denial of service. ### Patches The following patch was made: - Don't Allow Version Negotiation Packets for Server Connections - https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343 ### Workarounds Beyond upgrading to the patched versions, there is no other workaround. You must upgrade or disable MsQuic functionality.

CVE-2023-38171 Affected Microsoft.Native.Quic.MsQuic.Schannel Versions

2 component(s)
Fixed Versions:
2.2.3
Product / Package Ecosystem Affected Versions Fixed Version
Microsoft.Native.Quic.MsQuic.Schannel
nuget/Microsoft.Native.Quic.MsQuic.Schannel
NuGet
< 2.2.3
2.2.3
Microsoft.Native.Quic.MsQuic.OpenSSL
nuget/Microsoft.Native.Quic.MsQuic.OpenSSL
NuGet
< 2.2.3
2.2.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/microsoft/msquic/security/advisories/GHSA-xh5m-8qqp-c5x7
NVD — CVE-2023-38171 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-38171
Security Fix Commit FIX COMMIT
https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343
Microsoft.Native.Quic.MsQuic.Schannel Source Repository REPOSITORY
https://github.com/microsoft/msquic
msrc.microsoft.com/update-guide/vulner... WEB
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38171

Frequently Asked Questions

What is CVE-2023-38171?
CVE-2023-38171 is a security vulnerability in Microsoft.Native.Quic.MsQuic.Schannel involving Remote Denial of Service Vulnerability in Microsoft.Native.Quic.MsQuic.Schannel under CWE-400: Uncontrolled Resource Consumption.
Which Microsoft.Native.Quic.MsQuic.Schannel versions are affected?
Affected versions include releases prior to 2.2.3 across affected packages: Microsoft.Native.Quic.MsQuic.Schannel, Microsoft.Native.Quic.MsQuic.OpenSSL.
What version fixes CVE-2023-38171?
Upgrading to 2.2.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Microsoft.Native.Quic.MsQuic.Schannel affected?
Yes, Microsoft.Native.Quic.MsQuic.Schannel is affected in releases prior to 2.2.3. Upgrade your dependency to 2.2.3 or later.
Is Microsoft.Native.Quic.MsQuic.OpenSSL affected?
Yes, Microsoft.Native.Quic.MsQuic.OpenSSL is affected in releases prior to 2.2.3. Upgrade your dependency to 2.2.3 or later.
What is the CVSS score of CVE-2023-38171?
CVE-2023-38171 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2023-38171?
CVE-2023-38171 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check NuGet dependencies for CVE-2023-38171?
Run the dependency tree command: 'inspect dependencies for Microsoft.Native.Quic.MsQuic.Schannel'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xh5m-8qqp-c5x7",
  "modified" : "2024-06-03T18:35:09Z",
  "published" : "2023-10-10T21:23:27Z",
  "aliases" : [ "CVE-2023-38171" ],
  "summary" : "Remote Denial of Service Vulnerability in Microsoft.Native.Quic.MsQuic.Schannel",
  "details" : "### Impact\nThe MsQuic server application or process will crash, resulting in a denial of service.\n\n### Patches\nThe following patch was made:\n\n- Don't Allow Version Negotiation Packets for Server Connections - https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343\n\n### Workarounds\nBeyond upgrading to the patched versions, there is no other workaround. You must upgrade or disable MsQuic functionality.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.Native.Quic.MsQuic.Schannel"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.2.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.Native.Quic.MsQuic.OpenSSL"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.2.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/security/advisories/GHSA-xh5m-8qqp-c5x7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-38171"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/microsoft/msquic"
  }, {
    "type" : "WEB",
    "url" : "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38171"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-476" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-10-10T21:23:27Z",
    "nvd_published_at" : "2023-10-10T18:15:18Z"
  }
}