CVE-2021-26543: Git parse Command Injection Vulnerability

HIGH
Advisory Identifier: GHSA-m744-2jj8-vpfv
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CVSS 8.8
CWE-74
Published
Advisory Summary

CVE-2021-26543 is a HIGH (CVSS 8.8) command injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')) affecting Git parse libraries in the npm ecosystem. The issue involves command injection in git-parse. Remediation is available by upgrading affected packages to version 1.0.5.

CVE-2021-26543 at a Glance

CVE Identifier CVE-2021-26543
GHSA Identifier GHSA-m744-2jj8-vpfv
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Affected Product Git parse
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 8.8

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
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-2021-26543

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

git-parse fixed: 1.0.5 
npm install git-parse@1.0.5
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls git-parse

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-26543, inspect your project dependencies using npm:

npm ls git-parse

Analyze the terminal output to locate any version of Git parse in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.5), your application is affected.

Note: The npm ls git-parse command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'), where the product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. In Git parse, 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

The "gitDiff" function in Wayfair git-parse <=1.0.4 has a command injection vulnerability. Clients of the git-parse library are unlikely to be aware of this, so they might unwittingly write code that contains a vulnerability.

CVE-2021-26543 Affected Git parse Versions

1 component(s)
Fixed Versions:
1.0.5
Product / Package Ecosystem Affected Versions Fixed Version
git-parse
npm/git-parse
npm
< 1.0.5
1.0.5

References

NVD — CVE-2021-26543 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26543
advisory.checkmarx.net/advisory/cx-2020-43... WEB
https://advisory.checkmarx.net/advisory/CX-2020-4302
Git parse Source Repository REPOSITORY
https://github.com/wayfair/git-parse
www.npmjs.com/package/git-parse WEB
https://www.npmjs.com/package/git-parse

Frequently Asked Questions

What is CVE-2021-26543?
CVE-2021-26543 is a security vulnerability in Git parse involving Command injection in git-parse under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection').
Which Git parse versions are affected?
Affected versions include releases prior to 1.0.5 across affected packages: git-parse.
What version fixes CVE-2021-26543?
Upgrading to 1.0.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is git-parse affected?
Yes, git-parse is affected in releases prior to 1.0.5. Upgrade your dependency to 1.0.5 or later.
What is the CVSS score of CVE-2021-26543?
CVE-2021-26543 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-26543?
CVE-2021-26543 is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.).
How can I check npm dependencies for CVE-2021-26543?
Run the dependency tree command: 'npm ls git-parse'. 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-m744-2jj8-vpfv",
  "modified" : "2022-02-10T23:51:16Z",
  "published" : "2022-02-10T23:51:16Z",
  "aliases" : [ "CVE-2021-26543" ],
  "summary" : "Command injection in git-parse",
  "details" : "The \"gitDiff\" function in Wayfair git-parse <=1.0.4 has a command injection vulnerability. Clients of the git-parse library are unlikely to be aware of this, so they might unwittingly write code that contains a vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "git-parse"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-26543"
  }, {
    "type" : "WEB",
    "url" : "https://advisory.checkmarx.net/advisory/CX-2020-4302"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/wayfair/git-parse"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/git-parse"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-19T20:35:31Z",
    "nvd_published_at" : "2021-05-06T13:15:00Z"
  }
}