CVE-2021-42279: Microsoft.ChakraCore Chakra Scripting Engine And ChakraCore Vulnerability

HIGH
Advisory Identifier: GHSA-jgrp-6qqq-3284
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CVSS 7.5
CWE-787
Published
Advisory Summary

CVE-2021-42279 is a HIGH (CVSS 7.5) chakra scripting engine and chakracore vulnerability (CWE-787: Out-of-bounds Write) affecting Microsoft.ChakraCore libraries in the NuGet ecosystem. The issue involves chakra scripting engine and chakracore vulnerable to memory corruption. Remediation is available in the latest vendor maintenance releases.

CVE-2021-42279 at a Glance

CVE Identifier CVE-2021-42279
GHSA Identifier GHSA-jgrp-6qqq-3284
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-787: Out-of-bounds Write
Affected Product Microsoft.ChakraCore
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:H/PR:N/UI:R/S:U/C:H/I:H/A:H).

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

How to Fix CVE-2021-42279

To remediate this vulnerability, upgrade all affected Microsoft.ChakraCore 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.ChakraCore fixed: Latest secure release 
Upgrade Microsoft.ChakraCore to Latest secure release
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.ChakraCore

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-42279, inspect your project dependencies for Microsoft.ChakraCore:

inspect dependencies for Microsoft.ChakraCore

Analyze the terminal output to locate any version of Microsoft.ChakraCore in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-787: Out-of-bounds Write, where the product writes data past the end, or before the beginning, of the intended buffer. In Microsoft.ChakraCore, 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

Chakra Scripting Engine and ChakraCore are vulnerable to memory corruption due to an out-of-bounds write. The Microsoft advisory for CVE-2021-42279 was modified in August 2022 to include Microsoft.ChakraCore as an affected product.

CVE-2021-42279 Affected Microsoft.ChakraCore Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
Microsoft.ChakraCore
nuget/Microsoft.ChakraCore
NuGet
≤ 1.11.24

References

NVD — CVE-2021-42279 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-42279
Microsoft.ChakraCore Security Information SECURITY
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42279

Frequently Asked Questions

What is CVE-2021-42279?
CVE-2021-42279 is a security vulnerability in Microsoft.ChakraCore involving Chakra Scripting Engine and ChakraCore Vulnerable to Memory Corruption under CWE-787: Out-of-bounds Write.
Which Microsoft.ChakraCore versions are affected?
Affected versions include releases prior to current release patches across affected packages: Microsoft.ChakraCore.
What version fixes CVE-2021-42279?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is Microsoft.ChakraCore affected?
Yes, Microsoft.ChakraCore is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2021-42279?
CVE-2021-42279 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-42279?
CVE-2021-42279 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).
How can I check NuGet dependencies for CVE-2021-42279?
Run the dependency tree command: 'inspect dependencies for Microsoft.ChakraCore'. 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-jgrp-6qqq-3284",
  "modified" : "2022-08-30T20:17:18Z",
  "published" : "2022-05-24T19:20:22Z",
  "aliases" : [ "CVE-2021-42279" ],
  "summary" : "Chakra Scripting Engine and ChakraCore Vulnerable to Memory Corruption",
  "details" : "Chakra Scripting Engine and ChakraCore are vulnerable to memory corruption due to an out-of-bounds write. The Microsoft advisory for CVE-2021-42279 was modified in August 2022 to include Microsoft.ChakraCore as an affected product.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.ChakraCore"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.11.24"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-42279"
  }, {
    "type" : "WEB",
    "url" : "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42279"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-08-30T20:17:18Z",
    "nvd_published_at" : "2021-11-10T01:19:00Z"
  }
}