CVE-2021-30560: Nokogiri Nokogiri Has Vulnerable Dependencies On Vulnerability

HIGH
Advisory Identifier: GHSA-59gp-qqm7-cw4j
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CVSS 8.8
CWE-416
Published
Advisory Summary

CVE-2021-30560 is a HIGH (CVSS 8.8) nokogiri has vulnerable dependencies on vulnerability (CWE-416: Use After Free) affecting Nokogiri libraries in the RubyGems ecosystem. The issue involves nokogiri has vulnerable dependencies on libxml2 and libxslt. Remediation is available by upgrading affected packages to version 1.13.2.

CVE-2021-30560 at a Glance

CVE Identifier CVE-2021-30560
GHSA Identifier GHSA-59gp-qqm7-cw4j
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-416: Use After Free
Affected Product Nokogiri
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 8.8

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:R/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 Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-30560

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

nokogiri fixed: 1.13.2 
Upgrade nokogiri to 1.13.2
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 nokogiri

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-30560, inspect your project dependencies for Nokogiri:

inspect dependencies for nokogiri

Analyze the terminal output to locate any version of Nokogiri in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.13.2), 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-416: Use After Free, where the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. In Nokogiri, 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

Use after free in Blink XSLT in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

CVE-2021-30560 Affected Nokogiri Versions

1 component(s)
Fixed Versions:
1.13.2
Product / Package Ecosystem Affected Versions Fixed Version
nokogiri
gem/nokogiri
RubyGems
< 1.13.2
1.13.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-fq42-c5rg-92c2
NVD — CVE-2021-30560 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30560
chromereleases.googleblog.com/2021/07/stable-chan... WEB
https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop.html
crbug.com/1219209 WEB
https://crbug.com/1219209
Nokogiri Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2021-30560.yml
Nokogiri Source Repository REPOSITORY
https://github.com/sparklemotion/nokogiri
Nokogiri Release RELEASE
https://github.com/sparklemotion/nokogiri/releases/tag/v1.13.2
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2022/09/msg00010.html
Nokogiri Security Information SECURITY
https://security.gentoo.org/glsa/202310-23
Nokogiri Security Information SECURITY
https://www.debian.org/security/2022/dsa-5216

Frequently Asked Questions

What is CVE-2021-30560?
CVE-2021-30560 is a security vulnerability in Nokogiri involving Nokogiri has vulnerable dependencies on libxml2 and libxslt under CWE-416: Use After Free.
Which Nokogiri versions are affected?
Affected versions include releases prior to 1.13.2 across affected packages: nokogiri.
What version fixes CVE-2021-30560?
Upgrading to 1.13.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is nokogiri affected?
Yes, nokogiri is affected in releases prior to 1.13.2. Upgrade your dependency to 1.13.2 or later.
What is the CVSS score of CVE-2021-30560?
CVE-2021-30560 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-30560?
CVE-2021-30560 is classified under CWE-416: Use After Free (The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.).
How can I check RubyGems dependencies for CVE-2021-30560?
Run the dependency tree command: 'inspect dependencies for nokogiri'. 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-59gp-qqm7-cw4j",
  "modified" : "2023-06-23T21:37:02Z",
  "published" : "2022-05-24T19:09:47Z",
  "aliases" : [ "CVE-2021-30560" ],
  "summary" : "Nokogiri has vulnerable dependencies on libxml2 and libxslt",
  "details" : "Use after free in Blink XSLT in Google Chrome prior to 91.0.4472.164 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "nokogiri"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.13.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-fq42-c5rg-92c2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-30560"
  }, {
    "type" : "WEB",
    "url" : "https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop.html"
  }, {
    "type" : "WEB",
    "url" : "https://crbug.com/1219209"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2021-30560.yml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sparklemotion/nokogiri"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sparklemotion/nokogiri/releases/tag/v1.13.2"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2022/09/msg00010.html"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/202310-23"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2022/dsa-5216"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-416" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-06-23T21:37:02Z",
    "nvd_published_at" : "2021-08-03T19:15:00Z"
  }
}