CVE-2021-27290: Ssri Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-vx3p-948g-6vhq
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CVSS 7.5
CWE-400
Published
Advisory Summary

CVE-2021-27290 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Ssri libraries in the npm ecosystem. The issue involves regular expression denial of service (redos). Remediation is available by upgrading affected packages to version 6.0.2, 7.1.1, 8.0.1.

CVE-2021-27290 at a Glance

CVE Identifier CVE-2021-27290
GHSA Identifier GHSA-vx3p-948g-6vhq
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Ssri
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-2021-27290

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

ssri fixed: 6.0.2 
npm install ssri@6.0.2
ssri fixed: 7.1.1 
npm install ssri@7.1.1
ssri fixed: 8.0.1 
npm install ssri@8.0.1
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 ssri

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-27290, inspect your project dependencies using npm:

npm ls ssri

Analyze the terminal output to locate any version of Ssri in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.0.2), your application is affected.

Note: The npm ls ssri 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Ssri, 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

npm `ssri` 5.2.2-6.0.1 and 7.0.0-8.0.0, processes SRIs using a regular expression which is vulnerable to a denial of service. Malicious SRIs could take an extremely long time to process, leading to denial of service. This issue only affects consumers using the strict option.

CVE-2021-27290 Affected Ssri Versions

3 component(s)
Fixed Versions:
6.0.27.1.18.0.1
Product / Package Ecosystem Affected Versions Fixed Version
ssri
npm/ssri
npm
≥ 5.2.2
< 6.0.2
6.0.2
ssri
npm/ssri
npm
≥ 7.0.0
< 7.1.1
7.1.1
ssri
npm/ssri
npm
≥ 8.0.0
< 8.0.1
All 1 versions
8.0.0
8.0.1

References

NVD — CVE-2021-27290 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27290
Ssri Source Repository REPOSITORY
https://github.com/npm/ssri/pull/20#issuecomment-842677644
Security Fix Commit FIX COMMIT
https://github.com/npm/ssri/commit/76e223317d971f19e4db8191865bdad5edee40d2
Security Fix Commit FIX COMMIT
https://github.com/npm/ssri/commit/809c84d09ea87c3857fa171d42914586899d4538
Security Fix Commit FIX COMMIT
https://github.com/npm/ssri/commit/b30dfdb00bb94ddc49a25a85a18fb27afafdfbb1
cert-portal.siemens.com/productcert/pdf/ssa... WEB
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
doyensec.com/resources/doyensec_... WEB
https://doyensec.com/resources/Doyensec_Advisory_ssri_redos.pdf
Ssri Source Repository REPOSITORY
https://github.com/npm/ssri
Ssri Source Repository REPOSITORY
https://github.com/yetingli/SaveResults/blob/main/pdf/ssri-redos.pdf
npmjs.com WEB
https://npmjs.com
www.npmjs.com/package/ssri WEB
https://www.npmjs.com/package/ssri
Ssri Security Information SECURITY
https://www.oracle.com/security-alerts/cpuoct2021.html

Frequently Asked Questions

What is CVE-2021-27290?
CVE-2021-27290 is a security vulnerability in Ssri involving Regular Expression Denial of Service (ReDoS) under CWE-400: Uncontrolled Resource Consumption.
Which Ssri versions are affected?
Affected versions include releases prior to 6.0.2, 7.1.1, 8.0.1 across affected packages: ssri.
What version fixes CVE-2021-27290?
Upgrading to 6.0.2, 7.1.1, 8.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ssri affected?
Yes, ssri is affected in releases prior to 6.0.2, 7.1.1, 8.0.1. Upgrade your dependency to 6.0.2, 7.1.1, 8.0.1 or later.
What is the CVSS score of CVE-2021-27290?
CVE-2021-27290 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-2021-27290?
CVE-2021-27290 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for CVE-2021-27290?
Run the dependency tree command: 'npm ls ssri'. 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-vx3p-948g-6vhq",
  "modified" : "2021-10-21T17:38:11Z",
  "published" : "2021-03-19T21:24:36Z",
  "aliases" : [ "CVE-2021-27290" ],
  "summary" : "Regular Expression Denial of Service (ReDoS)",
  "details" : "npm `ssri` 5.2.2-6.0.1 and 7.0.0-8.0.0, processes SRIs using a regular expression which is vulnerable to a denial of service. Malicious SRIs could take an extremely long time to process, leading to denial of service. This issue only affects consumers using the strict option.",
  "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" : "ssri"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.2.2"
      }, {
        "fixed" : "6.0.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "ssri"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.0"
      }, {
        "fixed" : "7.1.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "ssri"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.0.1"
      } ]
    } ],
    "versions" : [ "8.0.0" ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-27290"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/npm/ssri/pull/20#issuecomment-842677644"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/npm/ssri/commit/76e223317d971f19e4db8191865bdad5edee40d2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/npm/ssri/commit/809c84d09ea87c3857fa171d42914586899d4538"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/npm/ssri/commit/b30dfdb00bb94ddc49a25a85a18fb27afafdfbb1"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
  }, {
    "type" : "WEB",
    "url" : "https://doyensec.com/resources/Doyensec_Advisory_ssri_redos.pdf"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/npm/ssri"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yetingli/SaveResults/blob/main/pdf/ssri-redos.pdf"
  }, {
    "type" : "WEB",
    "url" : "https://npmjs.com"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/ssri"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpuoct2021.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-15T18:24:30Z",
    "nvd_published_at" : "2021-03-12T22:15:00Z"
  }
}