CVE-2019-0545: Microsoft.NETCore.App Exposure Of Sensitive Information Vulnerability

HIGH
Advisory Identifier: GHSA-2xjx-v99w-gqf3
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CVSS 7.5
CWE-200
Published
Advisory Summary

CVE-2019-0545 is a HIGH (CVSS 7.5) exposure of sensitive information vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Microsoft.NETCore.App libraries in the NuGet ecosystem. The issue involves exposure of sensitive information in system.net.http. Remediation is available by upgrading affected packages to version 2.1.7, 2.2.1.

CVE-2019-0545 at a Glance

CVE Identifier CVE-2019-0545
GHSA Identifier GHSA-2xjx-v99w-gqf3
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Microsoft.NETCore.App
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

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 High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2019-0545

To remediate this vulnerability, upgrade all affected Microsoft.NETCore.App 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.NETCore.App fixed: 2.1.7 
Upgrade Microsoft.NETCore.App to 2.1.7
Microsoft.NETCore.App fixed: 2.2.1 
Upgrade Microsoft.NETCore.App to 2.2.1
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.NETCore.App

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-0545, inspect your project dependencies for Microsoft.NETCore.App:

inspect dependencies for Microsoft.NETCore.App

Analyze the terminal output to locate any version of Microsoft.NETCore.App in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.1.7), 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-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Microsoft.NETCore.App, 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

An information disclosure vulnerability exists in .NET Framework and .NET Core which allows bypassing Cross-origin Resource Sharing (CORS) configurations, aka ".NET Framework Information Disclosure Vulnerability." This affects Microsoft .NET Framework 2.0, Microsoft .NET Framework 3.0, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 4.6, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.7/4.7.1/4.7.2, .NET Core 2.1, Microsoft .NET Framework 4.7.1/4.7.2, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.6/4.6.1/4.6.2, .NET Core 2.2, Microsoft .NET Framework 4.7.2.

CVE-2019-0545 Affected Microsoft.NETCore.App Versions

2 component(s)
Fixed Versions:
2.1.72.2.1
Product / Package Ecosystem Affected Versions Fixed Version
Microsoft.NETCore.App
nuget/Microsoft.NETCore.App
NuGet
≥ 2.1.0
< 2.1.7
2.1.7
Microsoft.NETCore.App
nuget/Microsoft.NETCore.App
NuGet
≥ 2.2.0
< 2.2.1
All 1 versions
2.2.0
2.2.1

References

NVD — CVE-2019-0545 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-0545
Microsoft.NETCore.App Source Repository REPOSITORY
https://github.com/dotnet/announcements/issues/94
access.redhat.com/errata/rhsa-2019:00... WEB
https://access.redhat.com/errata/RHSA-2019:0040
Microsoft.NETCore.App Security Information SECURITY
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0545
Microsoft.NETCore.App Security Information SECURITY
http://www.securityfocus.com/bid/106405

Frequently Asked Questions

What is CVE-2019-0545?
CVE-2019-0545 is a security vulnerability in Microsoft.NETCore.App involving Exposure of Sensitive Information in System.Net.Http under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Microsoft.NETCore.App versions are affected?
Affected versions include releases prior to 2.1.7, 2.2.1 across affected packages: Microsoft.NETCore.App.
What version fixes CVE-2019-0545?
Upgrading to 2.1.7, 2.2.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Microsoft.NETCore.App affected?
Yes, Microsoft.NETCore.App is affected in releases prior to 2.1.7, 2.2.1. Upgrade your dependency to 2.1.7, 2.2.1 or later.
What is the CVSS score of CVE-2019-0545?
CVE-2019-0545 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2019-0545?
CVE-2019-0545 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check NuGet dependencies for CVE-2019-0545?
Run the dependency tree command: 'inspect dependencies for Microsoft.NETCore.App'. 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-2xjx-v99w-gqf3",
  "modified" : "2022-07-08T19:27:45Z",
  "published" : "2022-05-14T01:41:10Z",
  "aliases" : [ "CVE-2019-0545" ],
  "summary" : "Exposure of Sensitive Information in System.Net.Http",
  "details" : "An information disclosure vulnerability exists in .NET Framework and .NET Core which allows bypassing Cross-origin Resource Sharing (CORS) configurations, aka \".NET Framework Information Disclosure Vulnerability.\" This affects Microsoft .NET Framework 2.0, Microsoft .NET Framework 3.0, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 4.6, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.7/4.7.1/4.7.2, .NET Core 2.1, Microsoft .NET Framework 4.7.1/4.7.2, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.6/4.6.1/4.6.2, .NET Core 2.2, Microsoft .NET Framework 4.7.2.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.NETCore.App"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.1.0"
      }, {
        "fixed" : "2.1.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.NETCore.App"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.2.0"
      }, {
        "fixed" : "2.2.1"
      } ]
    } ],
    "versions" : [ "2.2.0" ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-0545"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dotnet/announcements/issues/94"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:0040"
  }, {
    "type" : "WEB",
    "url" : "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0545"
  }, {
    "type" : "WEB",
    "url" : "http://www.securityfocus.com/bid/106405"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-07-08T19:27:45Z",
    "nvd_published_at" : "2019-01-08T21:29:00Z"
  }
}