CVE-2018-8292: System.Net.Http .NET Core Information Disclosure Vulnerability

HIGH
Advisory Identifier: GHSA-7jgj-8wvc-jh57
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CVSS 7.5
CWE-200
Published
Advisory Summary

CVE-2018-8292 is a HIGH (CVSS 7.5) .net core information disclosure vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting System.Net.Http libraries in the NuGet ecosystem. The issue involves .net core information disclosure. Remediation is available by upgrading affected packages to version 4.3.4.

CVE-2018-8292 at a Glance

CVE Identifier CVE-2018-8292
GHSA Identifier GHSA-7jgj-8wvc-jh57
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product System.Net.Http
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-2018-8292

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

System.Net.Http fixed: 4.3.4 
Upgrade System.Net.Http to 4.3.4
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 System.Net.Http

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-8292, inspect your project dependencies for System.Net.Http:

inspect dependencies for System.Net.Http

Analyze the terminal output to locate any version of System.Net.Http in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.3.4), 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 System.Net.Http, 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 Core when authentication information is inadvertently exposed in a redirect, aka ".NET Core Information Disclosure Vulnerability." This affects .NET Core 2.1, .NET Core 1.0, .NET Core 1.1, PowerShell Core 6.0.

CVE-2018-8292 Affected System.Net.Http Versions

1 component(s)
Fixed Versions:
4.3.4
Product / Package Ecosystem Affected Versions Fixed Version
System.Net.Http
nuget/System.Net.Http
NuGet
< 4.3.4
4.3.4

References

NVD — CVE-2018-8292 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-8292
System.Net.Http Source Repository REPOSITORY
https://github.com/dotnet/announcements/issues/88
access.redhat.com/errata/rhsa-2018:29... WEB
https://access.redhat.com/errata/RHSA-2018:2902
System.Net.Http Security Information SECURITY
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8292
System.Net.Http Security Information SECURITY
http://www.securityfocus.com/bid/105548

Frequently Asked Questions

What is CVE-2018-8292?
CVE-2018-8292 is a security vulnerability in System.Net.Http involving .NET Core Information Disclosure under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which System.Net.Http versions are affected?
Affected versions include releases prior to 4.3.4 across affected packages: System.Net.Http.
What version fixes CVE-2018-8292?
Upgrading to 4.3.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is System.Net.Http affected?
Yes, System.Net.Http is affected in releases prior to 4.3.4. Upgrade your dependency to 4.3.4 or later.
What is the CVSS score of CVE-2018-8292?
CVE-2018-8292 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-2018-8292?
CVE-2018-8292 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-2018-8292?
Run the dependency tree command: 'inspect dependencies for System.Net.Http'. 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-7jgj-8wvc-jh57",
  "modified" : "2021-04-21T19:15:50Z",
  "published" : "2021-04-21T19:16:06Z",
  "aliases" : [ "CVE-2018-8292" ],
  "summary" : ".NET Core Information Disclosure",
  "details" : "An information disclosure vulnerability exists in .NET Core when authentication information is inadvertently exposed in a redirect, aka \".NET Core Information Disclosure Vulnerability.\" This affects .NET Core 2.1, .NET Core 1.0, .NET Core 1.1, PowerShell Core 6.0.",
  "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" : "System.Net.Http"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.3.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-8292"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dotnet/announcements/issues/88"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:2902"
  }, {
    "type" : "WEB",
    "url" : "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8292"
  }, {
    "type" : "WEB",
    "url" : "http://www.securityfocus.com/bid/105548"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-21T19:15:50Z",
    "nvd_published_at" : null
  }
}