CVE-2021-30151: Sidekiq Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-grh7-935j-hg6w
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2021-30151 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Sidekiq libraries in the RubyGems ecosystem. The issue involves cross-site scripting in sidekiq. Remediation is available by upgrading affected packages to version 5.2.0, 6.2.1.

CVE-2021-30151 at a Glance

CVE Identifier CVE-2021-30151
GHSA Identifier GHSA-grh7-935j-hg6w
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Sidekiq
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 6.1

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:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-30151

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

sidekiq fixed: 5.2.0 
Upgrade sidekiq to 5.2.0
sidekiq fixed: 6.2.1 
Upgrade sidekiq to 6.2.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for sidekiq

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-30151, inspect your project dependencies for Sidekiq:

inspect dependencies for sidekiq

Analyze the terminal output to locate any version of Sidekiq in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.2.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Sidekiq, 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

Sidekiq through 5.1.3 and 6.x through 6.2.0 allows XSS via the queue name of the live-poll feature when Internet Explorer is used.

CVE-2021-30151 Affected Sidekiq Versions

2 component(s)
Fixed Versions:
5.2.06.2.1
Product / Package Ecosystem Affected Versions Fixed Version
sidekiq
gem/sidekiq
RubyGems
< 5.2.0
5.2.0
sidekiq
gem/sidekiq
RubyGems
≥ 6.0.0
< 6.2.1
6.2.1

References

NVD — CVE-2021-30151 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30151
Sidekiq Source Repository REPOSITORY
https://github.com/mperham/sidekiq/issues/4852
Security Fix Commit FIX COMMIT
https://github.com/mperham/sidekiq/commit/64f70339d1dcf50a55c00d36bfdb61d97ec63ed8
Sidekiq Source Repository REPOSITORY
https://github.com/mperham/sidekiq
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2022/03/msg00015.html

Frequently Asked Questions

What is CVE-2021-30151?
CVE-2021-30151 is a security vulnerability in Sidekiq involving Cross-site Scripting in Sidekiq under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Sidekiq versions are affected?
Affected versions include releases prior to 5.2.0, 6.2.1 across affected packages: sidekiq.
What version fixes CVE-2021-30151?
Upgrading to 5.2.0, 6.2.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is sidekiq affected?
Yes, sidekiq is affected in releases prior to 5.2.0, 6.2.1. Upgrade your dependency to 5.2.0, 6.2.1 or later.
What is the CVSS score of CVE-2021-30151?
CVE-2021-30151 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-30151?
CVE-2021-30151 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check RubyGems dependencies for CVE-2021-30151?
Run the dependency tree command: 'inspect dependencies for sidekiq'. 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-grh7-935j-hg6w",
  "modified" : "2023-01-24T15:03:47Z",
  "published" : "2021-10-06T17:47:17Z",
  "aliases" : [ "CVE-2021-30151" ],
  "summary" : "Cross-site Scripting in Sidekiq",
  "details" : "Sidekiq through 5.1.3 and 6.x through 6.2.0 allows XSS via the queue name of the live-poll feature when Internet Explorer is used.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "sidekiq"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.2.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "sidekiq"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
        "fixed" : "6.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-30151"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mperham/sidekiq/issues/4852"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mperham/sidekiq/commit/64f70339d1dcf50a55c00d36bfdb61d97ec63ed8"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mperham/sidekiq"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2022/03/msg00015.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-10-06T16:52:11Z",
    "nvd_published_at" : "2021-04-06T06:15:00Z"
  }
}