CVE-2020-7782: Spritesheet js Command Injection Vulnerability

CRITICAL
Advisory Identifier: GHSA-333x-qr3v-g4xx
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CVSS 9.8
CWE-74
Published
Advisory Summary

CVE-2020-7782 is a CRITICAL (CVSS 9.8) command injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')) affecting Spritesheet js libraries in the npm ecosystem. The issue involves command injection in spritesheet-js. Remediation is available in the latest vendor maintenance releases.

CVE-2020-7782 at a Glance

CVE Identifier CVE-2020-7782
GHSA Identifier GHSA-333x-qr3v-g4xx
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Affected Product Spritesheet js
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:N/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 None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2020-7782

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

spritesheet-js fixed: Latest secure release 
npm install spritesheet-js@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: 

npm ls spritesheet-js

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7782, inspect your project dependencies using npm:

npm ls spritesheet-js

Analyze the terminal output to locate any version of Spritesheet js 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: The npm ls spritesheet-js 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 Spritesheet js, 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

This affects all versions of package spritesheet-js. It depends on a vulnerable package platform-command. The injection point is located in line 32 in lib/generator.js, which is triggered by main entry of the package.

CVE-2020-7782 Affected Spritesheet js Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
spritesheet-js
npm/spritesheet-js
npm
≤ 1.2.6

References

NVD — CVE-2020-7782 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7782
Spritesheet js Source Repository REPOSITORY
https://github.com/krzysztof-o/spritesheet.js/blob/master/lib/generator.js#23L32
snyk.io/vuln/snyk-js-sprite... WEB
https://snyk.io/vuln/SNYK-JS-SPRITESHEETJS-1048333
www.npmjs.com/package/spritesheet... WEB
https://www.npmjs.com/package/spritesheet-js

Frequently Asked Questions

What is CVE-2020-7782?
CVE-2020-7782 is a security vulnerability in Spritesheet js involving Command injection in spritesheet-js under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection').
Which Spritesheet js versions are affected?
Affected versions include releases prior to current release patches across affected packages: spritesheet-js.
What version fixes CVE-2020-7782?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is spritesheet-js affected?
Yes, spritesheet-js 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-2020-7782?
CVE-2020-7782 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-7782?
CVE-2020-7782 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-2020-7782?
Run the dependency tree command: 'npm ls spritesheet-js'. 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-333x-qr3v-g4xx",
  "modified" : "2021-04-05T19:04:46Z",
  "published" : "2021-04-13T15:30:16Z",
  "aliases" : [ "CVE-2020-7782" ],
  "summary" : "Command injection in spritesheet-js",
  "details" : "This affects all versions of package spritesheet-js. It depends on a vulnerable package platform-command. The injection point is located in line 32 in lib/generator.js, which is triggered by main entry of the package.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "spritesheet-js"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.2.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7782"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/krzysztof-o/spritesheet.js/blob/master/lib/generator.js#23L32"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-SPRITESHEETJS-1048333"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/spritesheet-js"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-05T19:04:46Z",
    "nvd_published_at" : "2021-02-08T19:15:00Z"
  }
}