CVE-2020-7615: Fsa OS Command Injection Vulnerability

MODERATE
Advisory Identifier: GHSA-3p94-vj97-fm4q
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CVSS 7.8
CWE-78
Published
Advisory Summary

CVE-2020-7615 is a MODERATE (CVSS 7.8) os command injection vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Fsa libraries in the npm ecosystem. The issue involves os command injection in fsa. Remediation is available in the latest vendor maintenance releases.

CVE-2020-7615 at a Glance

CVE Identifier CVE-2020-7615
GHSA Identifier GHSA-3p94-vj97-fm4q
Severity MODERATE
CVSS v3.1 Base Score 7.8
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Fsa
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.8

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

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2020-7615

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

fsa fixed: Latest secure release 
npm install fsa@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 fsa

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7615, inspect your project dependencies using npm:

npm ls fsa

Analyze the terminal output to locate any version of Fsa 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 fsa 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-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Fsa, 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

fsa through 0.5.1 is vulnerable to Command Injection. The first argument of 'execGitCommand()', located within 'lib/rep.js#63' can be controlled by users without any sanitization to inject arbitrary commands.

CVE-2020-7615 Affected Fsa Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
fsa
npm/fsa
npm
≤ 0.5.1

References

NVD — CVE-2020-7615 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7615
Fsa Source Repository REPOSITORY
https://github.com/gregof/fsa/blob/master/lib/rep.js#L12
snyk.io/vuln/snyk-js-fsa-56... WEB
https://snyk.io/vuln/SNYK-JS-FSA-564118

Frequently Asked Questions

What is CVE-2020-7615?
CVE-2020-7615 is a security vulnerability in Fsa involving OS Command Injection in fsa under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Fsa versions are affected?
Affected versions include releases prior to current release patches across affected packages: fsa.
What version fixes CVE-2020-7615?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is fsa affected?
Yes, fsa 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-2020-7615?
CVE-2020-7615 has a CVSS v3.1 base score of 7.8 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-7615?
CVE-2020-7615 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check npm dependencies for CVE-2020-7615?
Run the dependency tree command: 'npm ls fsa'. 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-3p94-vj97-fm4q",
  "modified" : "2021-05-25T16:28:38Z",
  "published" : "2021-12-09T19:56:44Z",
  "aliases" : [ "CVE-2020-7615" ],
  "summary" : "OS Command Injection in fsa",
  "details" : "fsa through 0.5.1 is vulnerable to Command Injection. The first argument of 'execGitCommand()', located within 'lib/rep.js#63' can be controlled by users without any sanitization to inject arbitrary commands.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "fsa"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.5.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7615"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gregof/fsa/blob/master/lib/rep.js#L12"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-FSA-564118"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-78" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-25T16:28:38Z",
    "nvd_published_at" : "2020-04-07T14:15:00Z"
  }
}