CVE-2022-25758: Scss tokenizer Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-7mwh-4pqv-wmr8
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CVSS 7.5
CWE-1333
Published
Advisory Summary

CVE-2022-25758 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-1333: Inefficient Regular Expression Complexity) affecting Scss tokenizer libraries in the npm ecosystem. The issue involves regular expression denial of service in scss-tokenizer. Remediation is available by upgrading affected packages to version 0.4.3.

CVE-2022-25758 at a Glance

CVE Identifier CVE-2022-25758
GHSA Identifier GHSA-7mwh-4pqv-wmr8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-1333: Inefficient Regular Expression Complexity
Affected Product Scss tokenizer
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

How to Fix CVE-2022-25758

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

scss-tokenizer fixed: 0.4.3 
npm install scss-tokenizer@0.4.3
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 scss-tokenizer

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2022-25758, inspect your project dependencies using npm:

npm ls scss-tokenizer

Analyze the terminal output to locate any version of Scss tokenizer in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.3), your application is affected.

Note: The npm ls scss-tokenizer 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-1333: Inefficient Regular Expression Complexity, where the product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. In Scss tokenizer, 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

All versions of the package `scss-tokenizer` prior to 0.4.3 are vulnerable to Regular Expression Denial of Service (ReDoS) via the `loadAnnotation()` function, due to the usage of insecure regex.

CVE-2022-25758 Affected Scss tokenizer Versions

1 component(s)
Fixed Versions:
0.4.3
Product / Package Ecosystem Affected Versions Fixed Version
scss-tokenizer
npm/scss-tokenizer
npm
< 0.4.3
0.4.3

References

NVD — CVE-2022-25758 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-25758
Scss tokenizer Source Repository REPOSITORY
https://github.com/sasstools/scss-tokenizer/issues/45
Scss tokenizer Source Repository REPOSITORY
https://github.com/sasstools/scss-tokenizer/pull/49
Security Fix Commit FIX COMMIT
https://github.com/sasstools/scss-tokenizer/commit/a53b6f233e648cc01acbdd89c58786cf8ba56e35
Scss tokenizer Source Repository REPOSITORY
https://github.com/sasstools/scss-tokenizer
snyk.io/vuln/snyk-java-orgw... WEB
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2936782
snyk.io/vuln/snyk-js-scssto... WEB
https://snyk.io/vuln/SNYK-JS-SCSSTOKENIZER-2339884

Frequently Asked Questions

What is CVE-2022-25758?
CVE-2022-25758 is a security vulnerability in Scss tokenizer involving Regular expression denial of service in scss-tokenizer under CWE-1333: Inefficient Regular Expression Complexity.
Which Scss tokenizer versions are affected?
Affected versions include releases prior to 0.4.3 across affected packages: scss-tokenizer.
What version fixes CVE-2022-25758?
Upgrading to 0.4.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is scss-tokenizer affected?
Yes, scss-tokenizer is affected in releases prior to 0.4.3. Upgrade your dependency to 0.4.3 or later.
What is the CVSS score of CVE-2022-25758?
CVE-2022-25758 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-25758?
CVE-2022-25758 is classified under CWE-1333: Inefficient Regular Expression Complexity (The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.).
How can I check npm dependencies for CVE-2022-25758?
Run the dependency tree command: 'npm ls scss-tokenizer'. 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-7mwh-4pqv-wmr8",
  "modified" : "2022-08-15T21:58:30Z",
  "published" : "2022-07-02T00:00:19Z",
  "aliases" : [ "CVE-2022-25758" ],
  "summary" : "Regular expression denial of service in scss-tokenizer",
  "details" : "All versions of the package `scss-tokenizer` prior to 0.4.3 are vulnerable to Regular Expression Denial of Service (ReDoS) via the `loadAnnotation()` function, due to the usage of insecure regex.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "scss-tokenizer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.4.2"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-25758"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sasstools/scss-tokenizer/issues/45"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sasstools/scss-tokenizer/pull/49"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sasstools/scss-tokenizer/commit/a53b6f233e648cc01acbdd89c58786cf8ba56e35"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sasstools/scss-tokenizer"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2936782"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-SCSSTOKENIZER-2339884"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-07-06T21:07:13Z",
    "nvd_published_at" : "2022-07-01T20:15:00Z"
  }
}