CVE-2019-0981: System.Private.Uri Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-5f2m-466j-3848
Share
CVSS 7.5
Published
Advisory Summary

CVE-2019-0981 is a HIGH (CVSS 7.5) denial of service vulnerability (General Security Weakness) affecting System.Private.Uri libraries in the NuGet ecosystem. The issue involves denial of service in asp.net core. Remediation is available by upgrading affected packages to version 4.3.2.

CVE-2019-0981 at a Glance

CVE Identifier CVE-2019-0981
GHSA Identifier GHSA-5f2m-466j-3848
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification General Security Weakness
Affected Product System.Private.Uri
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: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-2019-0981

To remediate this vulnerability, upgrade all affected System.Private.Uri 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.Private.Uri fixed: 4.3.2 
Upgrade System.Private.Uri to 4.3.2
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.Private.Uri

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-0981, inspect your project dependencies for System.Private.Uri:

inspect dependencies for System.Private.Uri

Analyze the terminal output to locate any version of System.Private.Uri in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.3.2), 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 General Security Weakness. In System.Private.Uri, 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

A denial of service vulnerability exists when .NET Framework or .NET Core improperly handle web requests, aka '.Net Framework and .Net Core Denial of Service Vulnerability'. This CVE ID is unique from CVE-2019-0820, CVE-2019-0980.

CVE-2019-0981 Affected System.Private.Uri Versions

1 component(s)
Fixed Versions:
4.3.2
Product / Package Ecosystem Affected Versions Fixed Version
System.Private.Uri
nuget/System.Private.Uri
NuGet
≥ 4.3.0
< 4.3.2
4.3.2

References

NVD — CVE-2019-0981 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-0981
System.Private.Uri Source Repository REPOSITORY
https://github.com/dotnet/announcements/issues/113
System.Private.Uri Source Repository REPOSITORY
https://github.com/github/advisory-database/issues/302
System.Private.Uri Security Information SECURITY
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0981

Frequently Asked Questions

What is CVE-2019-0981?
CVE-2019-0981 is a security vulnerability in System.Private.Uri involving Denial of service in ASP.NET Core under General Security Weakness.
Which System.Private.Uri versions are affected?
Affected versions include releases prior to 4.3.2 across affected packages: System.Private.Uri.
What version fixes CVE-2019-0981?
Upgrading to 4.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is System.Private.Uri affected?
Yes, System.Private.Uri is affected in releases prior to 4.3.2. Upgrade your dependency to 4.3.2 or later.
What is the CVSS score of CVE-2019-0981?
CVE-2019-0981 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:N/I:N/A:H.
What CWE is associated with CVE-2019-0981?
CVE-2019-0981 is classified under General Security Weakness.
How can I check NuGet dependencies for CVE-2019-0981?
Run the dependency tree command: 'inspect dependencies for System.Private.Uri'. 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-5f2m-466j-3848",
  "modified" : "2022-07-07T23:26:13Z",
  "published" : "2022-05-24T16:45:54Z",
  "aliases" : [ "CVE-2019-0981" ],
  "summary" : "Denial of service in ASP.NET Core",
  "details" : "A denial of service vulnerability exists when .NET Framework or .NET Core improperly handle web requests, aka '.Net Framework and .Net Core Denial of Service Vulnerability'. This CVE ID is unique from CVE-2019-0820, CVE-2019-0980.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "System.Private.Uri"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.3.0"
      }, {
        "fixed" : "4.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-0981"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dotnet/announcements/issues/113"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/github/advisory-database/issues/302"
  }, {
    "type" : "WEB",
    "url" : "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0981"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-07-07T23:26:13Z",
    "nvd_published_at" : "2019-05-16T19:29:00Z"
  }
}