GHSA-v6gp-9mmm-c6p5: Nokogiri Out-of-bounds Write Vulnerability

HIGH
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CVSS 7.5
CWE-787
Published
Advisory Summary

GHSA-v6gp-9mmm-c6p5 is a HIGH (CVSS 7.5) out-of-bounds write vulnerability (CWE-787: Out-of-bounds Write) affecting Nokogiri libraries in the RubyGems ecosystem. The issue involves out-of-bounds write in zlib affects nokogiri. Remediation is available by upgrading affected packages to version 1.13.4.

GHSA-v6gp-9mmm-c6p5 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-v6gp-9mmm-c6p5
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-787: Out-of-bounds Write
Affected Product Nokogiri
Package Ecosystem RubyGems
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 GHSA-v6gp-9mmm-c6p5

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: 1.13.4 
Upgrade nokogiri to 1.13.4
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 GHSA-v6gp-9mmm-c6p5, 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 1.13.4), 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-787: Out-of-bounds Write, where the product writes data past the end, or before the beginning, of the intended buffer. 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

## Summary Nokogiri v1.13.4 updates the vendored zlib from 1.2.11 to 1.2.12, which addresses [CVE-2018-25032](https://nvd.nist.gov/vuln/detail/CVE-2018-25032). That CVE is scored as CVSS 7.4 "High" on the NVD record as of 2022-04-05. Please note that this advisory only applies to the CRuby implementation of Nokogiri `< 1.13.4`, and only if the packaged version of `zlib` is being used. Please see [this document](https://nokogiri.org/LICENSE-DEPENDENCIES.html#default-platform-release-ruby) for a complete description of which platform gems vendor `zlib`. If you've overridden defaults at installation time to use system libraries instead of packaged libraries, you should instead pay attention to your distro's `zlib` release announcements. ## Mitigation Upgrade to Nokogiri `>= v1.13.4`. ## Impact ### [CVE-2018-25032](https://nvd.nist.gov/vuln/detail/CVE-2018-25032) in zlib - **Severity**: High - **Type**: [CWE-787](https://cwe.mitre.org/data/definitions/787.html) Out of bounds write - **Description**: zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.

GHSA-v6gp-9mmm-c6p5 Affected Nokogiri Versions

1 component(s)
Fixed Versions:
1.13.4
Product / Package Ecosystem Affected Versions Fixed Version
nokogiri
gem/nokogiri
RubyGems
< 1.13.4
1.13.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-v6gp-9mmm-c6p5
NVD — GHSA-v6gp-9mmm-c6p5 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-25032
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-jc36-42cf-vqwj
Nokogiri Source Repository REPOSITORY
https://github.com/sparklemotion/nokogiri
Nokogiri Release RELEASE
https://github.com/sparklemotion/nokogiri/releases/tag/v1.13.4
Nokogiri Security Information SECURITY
https://groups.google.com/g/ruby-security-ann/c/vX7qSjsvWis/m/TJWN4oOKBwAJ?utm_medium=email&utm_source=footer

Frequently Asked Questions

What is GHSA-v6gp-9mmm-c6p5?
GHSA-v6gp-9mmm-c6p5 is a security vulnerability in Nokogiri involving Out-of-bounds Write in zlib affects Nokogiri under CWE-787: Out-of-bounds Write.
Which Nokogiri versions are affected?
Affected versions include releases prior to 1.13.4 across affected packages: nokogiri.
What version fixes GHSA-v6gp-9mmm-c6p5?
Upgrading to 1.13.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is nokogiri affected?
Yes, nokogiri is affected in releases prior to 1.13.4. Upgrade your dependency to 1.13.4 or later.
What is the CVSS score of GHSA-v6gp-9mmm-c6p5?
GHSA-v6gp-9mmm-c6p5 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 GHSA-v6gp-9mmm-c6p5?
GHSA-v6gp-9mmm-c6p5 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).
How can I check RubyGems dependencies for GHSA-v6gp-9mmm-c6p5?
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-v6gp-9mmm-c6p5",
  "modified" : "2022-04-11T21:21:28Z",
  "published" : "2022-04-11T21:21:28Z",
  "aliases" : [ ],
  "summary" : "Out-of-bounds Write in zlib affects Nokogiri",
  "details" : "## Summary\n\nNokogiri v1.13.4 updates the vendored zlib from 1.2.11 to 1.2.12, which addresses [CVE-2018-25032](https://nvd.nist.gov/vuln/detail/CVE-2018-25032). That CVE is scored as CVSS 7.4 \"High\" on the NVD record as of 2022-04-05.\n\nPlease note that this advisory only applies to the CRuby implementation of Nokogiri `< 1.13.4`, and only if the packaged version of `zlib` is being used. Please see [this document](https://nokogiri.org/LICENSE-DEPENDENCIES.html#default-platform-release-ruby) for a complete description of which platform gems vendor `zlib`. If you've overridden defaults at installation time to use system libraries instead of packaged libraries, you should instead pay attention to your distro's `zlib` release announcements. \n\n## Mitigation\n\nUpgrade to Nokogiri `>= v1.13.4`.\n\n## Impact\n\n### [CVE-2018-25032](https://nvd.nist.gov/vuln/detail/CVE-2018-25032) in zlib\n\n- **Severity**: High\n- **Type**: [CWE-787](https://cwe.mitre.org/data/definitions/787.html) Out of bounds write\n- **Description**: zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.\n\n",
  "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" : "RubyGems",
      "name" : "nokogiri"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.13.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-v6gp-9mmm-c6p5"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-25032"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-jc36-42cf-vqwj"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sparklemotion/nokogiri"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sparklemotion/nokogiri/releases/tag/v1.13.4"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/g/ruby-security-ann/c/vX7qSjsvWis/m/TJWN4oOKBwAJ?utm_medium=email&utm_source=footer"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-04-11T21:21:28Z",
    "nvd_published_at" : null
  }
}