CVE-2020-29457: OPCFoundation.NetStandard.Opc.Ua.Core Improper Certificate Validation Vulnerability

MODERATE
Advisory Identifier: GHSA-mjww-934m-h4jw
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CVSS 4.4
CWE-295
Published
Advisory Summary

CVE-2020-29457 is a MODERATE (CVSS 4.4) improper certificate validation vulnerability (CWE-295: Improper Certificate Validation) affecting OPCFoundation.NetStandard.Opc.Ua.Core libraries in the NuGet ecosystem. The issue involves improper certificate validation in opcfoundation.netstandard.opc.ua.core. Remediation is available by upgrading affected packages to version 1.4.365.10.

CVE-2020-29457 at a Glance

CVE Identifier CVE-2020-29457
GHSA Identifier GHSA-mjww-934m-h4jw
Severity MODERATE
CVSS v3.1 Base Score 4.4
CWE Classification CWE-295: Improper Certificate Validation
Affected Product OPCFoundation.NetStandard.Opc.Ua.Core
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 4.4

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

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

How to Fix CVE-2020-29457

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

OPCFoundation.NetStandard.Opc.Ua.Core fixed: 1.4.365.10 
Upgrade OPCFoundation.NetStandard.Opc.Ua.Core to 1.4.365.10
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 OPCFoundation.NetStandard.Opc.Ua.Core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-29457, inspect your project dependencies for OPCFoundation.NetStandard.Opc.Ua.Core:

inspect dependencies for OPCFoundation.NetStandard.Opc.Ua.Core

Analyze the terminal output to locate any version of OPCFoundation.NetStandard.Opc.Ua.Core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.365.10), 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-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In OPCFoundation.NetStandard.Opc.Ua.Core, 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 Privilege Elevation vulnerability in OPC UA .NET Standard Stack 1.4.363.107 allows attackers to establish a connection using invalid certificates.

CVE-2020-29457 Affected OPCFoundation.NetStandard.Opc.Ua.Core Versions

1 component(s)
Fixed Versions:
1.4.365.10
Product / Package Ecosystem Affected Versions Fixed Version
OPCFoundation.NetStandard.Opc.Ua.Core
nuget/OPCFoundation.NetStandard.Opc.Ua.Core
NuGet
< 1.4.365.10
1.4.365.10

References

NVD — CVE-2020-29457 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-29457
OPCFoundation.NetStandard.Opc.Ua.Core Source Repository REPOSITORY
https://github.com/OPCFoundation/UA-.NETStandard/pull/1229
OPCFoundation.NetStandard.Opc.Ua.Core Source Repository REPOSITORY
https://github.com/OPCFoundation/UA-.NETStandard/pull/1229/commits/d815cfb972bd668c1b6e461f6ff97519d6b26f25
OPCFoundation.NetStandard.Opc.Ua.Core Source Repository REPOSITORY
https://github.com/OPCFoundation/UA-.NETStandard
OPCFoundation.NetStandard.Opc.Ua.Core Security Information SECURITY
https://opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2020-29457.pdf
www.nuget.org/packages/opcfoundat... WEB
https://www.nuget.org/packages/OPCFoundation.NetStandard.Opc.Ua

Frequently Asked Questions

What is CVE-2020-29457?
CVE-2020-29457 is a security vulnerability in OPCFoundation.NetStandard.Opc.Ua.Core involving Improper Certificate Validation in OPCFoundation.NetStandard.Opc.Ua.Core under CWE-295: Improper Certificate Validation.
Which OPCFoundation.NetStandard.Opc.Ua.Core versions are affected?
Affected versions include releases prior to 1.4.365.10 across affected packages: OPCFoundation.NetStandard.Opc.Ua.Core.
What version fixes CVE-2020-29457?
Upgrading to 1.4.365.10 (or the latest patched release for your respective branch) resolves the vulnerability.
Is OPCFoundation.NetStandard.Opc.Ua.Core affected?
Yes, OPCFoundation.NetStandard.Opc.Ua.Core is affected in releases prior to 1.4.365.10. Upgrade your dependency to 1.4.365.10 or later.
What is the CVSS score of CVE-2020-29457?
CVE-2020-29457 has a CVSS v3.1 base score of 4.4 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2020-29457?
CVE-2020-29457 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).
How can I check NuGet dependencies for CVE-2020-29457?
Run the dependency tree command: 'inspect dependencies for OPCFoundation.NetStandard.Opc.Ua.Core'. 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-mjww-934m-h4jw",
  "modified" : "2022-09-01T20:13:29Z",
  "published" : "2021-11-19T20:19:53Z",
  "aliases" : [ "CVE-2020-29457" ],
  "summary" : "Improper Certificate Validation in OPCFoundation.NetStandard.Opc.Ua.Core",
  "details" : "A Privilege Elevation vulnerability in OPC UA .NET Standard Stack 1.4.363.107 allows attackers to establish a connection using invalid certificates.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "OPCFoundation.NetStandard.Opc.Ua.Core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.365.10"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.4.365.2"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-29457"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OPCFoundation/UA-.NETStandard/pull/1229"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OPCFoundation/UA-.NETStandard/pull/1229/commits/d815cfb972bd668c1b6e461f6ff97519d6b26f25"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/OPCFoundation/UA-.NETStandard"
  }, {
    "type" : "WEB",
    "url" : "https://opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2020-29457.pdf"
  }, {
    "type" : "WEB",
    "url" : "https://www.nuget.org/packages/OPCFoundation.NetStandard.Opc.Ua"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-07T21:55:21Z",
    "nvd_published_at" : "2021-02-16T20:15:00Z"
  }
}