CVE-2021-23664: @isomorphic git/cors proxy Server Side Request Forgery Vulnerability

HIGH
Advisory Identifier: GHSA-v82v-rq72-phq9
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CVSS 8.6
CWE-918
Published
Advisory Summary

CVE-2021-23664 is a HIGH (CVSS 8.6) server side request forgery vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting @isomorphic git/cors proxy libraries in the npm ecosystem. The issue involves server side request forgery in @isomorphic-git/cors-proxy. Remediation is available by upgrading affected packages to version 2.7.1.

CVE-2021-23664 at a Glance

CVE Identifier CVE-2021-23664
GHSA Identifier GHSA-v82v-rq72-phq9
Severity HIGH
CVSS v3.1 Base Score 8.6
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product @isomorphic git/cors proxy
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 8.6

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:N/S:C/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 Changed (S:C)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2021-23664

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

@isomorphic-git/cors-proxy fixed: 2.7.1 
npm install @isomorphic-git/cors-proxy@2.7.1
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 @isomorphic-git/cors-proxy

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-23664, inspect your project dependencies using npm:

npm ls @isomorphic-git/cors-proxy

Analyze the terminal output to locate any version of @isomorphic git/cors proxy in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.7.1), your application is affected.

Note: The npm ls @isomorphic-git/cors-proxy 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-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In @isomorphic git/cors proxy, 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 package @isomorphic-git/cors-proxy before 2.7.1 is vulnerable to Server-side Request Forgery (SSRF) due to missing sanitization and validation of the redirection action in middleware.js.

CVE-2021-23664 Affected @isomorphic git/cors proxy Versions

1 component(s)
Fixed Versions:
2.7.1
Product / Package Ecosystem Affected Versions Fixed Version
@isomorphic-git/cors-proxy
npm/@isomorphic-git/cors-proxy
npm
< 2.7.1
2.7.1

References

NVD — CVE-2021-23664 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23664
Security Fix Commit FIX COMMIT
https://github.com/isomorphic-git/cors-proxy/commit/1b1c91e71d946544d97ccc7cf0ac62b859e03311
@isomorphic git/cors proxy Source Repository REPOSITORY
https://github.com/isomorphic-git/cors-proxy
snyk.io/vuln/snyk-js-isomor... WEB
https://snyk.io/vuln/SNYK-JS-ISOMORPHICGITCORSPROXY-1734788

Frequently Asked Questions

What is CVE-2021-23664?
CVE-2021-23664 is a security vulnerability in @isomorphic git/cors proxy involving Server side request forgery in @isomorphic-git/cors-proxy under CWE-918: Server-Side Request Forgery (SSRF).
Which @isomorphic git/cors proxy versions are affected?
Affected versions include releases prior to 2.7.1 across affected packages: @isomorphic-git/cors-proxy.
What version fixes CVE-2021-23664?
Upgrading to 2.7.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @isomorphic-git/cors-proxy affected?
Yes, @isomorphic-git/cors-proxy is affected in releases prior to 2.7.1. Upgrade your dependency to 2.7.1 or later.
What is the CVSS score of CVE-2021-23664?
CVE-2021-23664 has a CVSS v3.1 base score of 8.6 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2021-23664?
CVE-2021-23664 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check npm dependencies for CVE-2021-23664?
Run the dependency tree command: 'npm ls @isomorphic-git/cors-proxy'. 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-v82v-rq72-phq9",
  "modified" : "2022-01-31T22:00:02Z",
  "published" : "2022-01-26T22:13:05Z",
  "aliases" : [ "CVE-2021-23664" ],
  "summary" : "Server side request forgery in @isomorphic-git/cors-proxy",
  "details" : "The package @isomorphic-git/cors-proxy before 2.7.1 is vulnerable to Server-side Request Forgery (SSRF) due to missing sanitization and validation of the redirection action in middleware.js.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@isomorphic-git/cors-proxy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.7.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23664"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/isomorphic-git/cors-proxy/commit/1b1c91e71d946544d97ccc7cf0ac62b859e03311"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/isomorphic-git/cors-proxy"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-ISOMORPHICGITCORSPROXY-1734788"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-24T22:53:26Z",
    "nvd_published_at" : "2022-01-21T20:15:00Z"
  }
}