Vulnerabilities in pkg:npm/safe-flat

PACKAGE
Advisory Identifier: GHSA-33rv-m2gp-mm2r
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Advisory Summary

CVE-2021-25927 is a CRITICAL (CVSS 9.8) prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Safe flat libraries in the npm ecosystem. The issue involves prototype pollution in safe-flat. Remediation is available by upgrading affected packages to version 2.0.2.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/safe-flat

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/safe-flat. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-33rv-m2gp-mm2r CVE-2021-25927 CRITICAL Prototype pollution in safe-flat

CVE-2021-25927 at a Glance

CVE Identifier CVE-2021-25927
GHSA Identifier GHSA-33rv-m2gp-mm2r
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Safe flat
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-2021-25927

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

safe-flat fixed: 2.0.2 
npm install safe-flat@2.0.2
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 safe-flat

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-25927, inspect your project dependencies using npm:

npm ls safe-flat

Analyze the terminal output to locate any version of Safe flat in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.2), your application is affected.

Note: The npm ls safe-flat 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-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), where the product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. In Safe flat, 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

Prototype pollution vulnerability in 'safe-flat' versions 2.0.0 through 2.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.

CVE-2021-25927 Affected Safe flat Versions

1 component(s)
Fixed Versions:
2.0.2
Product / Package Ecosystem Affected Versions Fixed Version
safe-flat
npm/safe-flat
npm
≥ 2.0.0
< 2.0.2
2.0.2

References

NVD — CVE-2021-25927 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-25927
Security Fix Commit FIX COMMIT
https://github.com/jessie-codes/safe-flat/commit/4b9b7db976bba8c968354f4315f5f9c219b7cbf3
www.whitesourcesoftware.com/vulnerability-datab... WEB
https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25927

Frequently Asked Questions

What is CVE-2021-25927?
CVE-2021-25927 is a security vulnerability in Safe flat involving Prototype pollution in safe-flat under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Safe flat versions are affected?
Affected versions include releases prior to 2.0.2 across affected packages: safe-flat.
What version fixes CVE-2021-25927?
Upgrading to 2.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is safe-flat affected?
Yes, safe-flat is affected in releases prior to 2.0.2. Upgrade your dependency to 2.0.2 or later.
What is the CVSS score of CVE-2021-25927?
CVE-2021-25927 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-2021-25927?
CVE-2021-25927 is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.).
How can I check npm dependencies for CVE-2021-25927?
Run the dependency tree command: 'npm ls safe-flat'. 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-33rv-m2gp-mm2r",
  "modified" : "2021-05-20T21:34:56Z",
  "published" : "2021-06-21T17:18:29Z",
  "aliases" : [ "CVE-2021-25927" ],
  "summary" : "Prototype pollution in safe-flat",
  "details" : "Prototype pollution vulnerability in 'safe-flat' versions 2.0.0 through 2.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.",
  "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" : "safe-flat"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.0.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-25927"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jessie-codes/safe-flat/commit/4b9b7db976bba8c968354f4315f5f9c219b7cbf3"
  }, {
    "type" : "WEB",
    "url" : "https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25927"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-20T21:34:56Z",
    "nvd_published_at" : "2021-04-26T11:15:00Z"
  }
}