GHSA-v6gp-9mmm-c6p5: Out-of-bounds Write in zlib affects Nokogiri

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
Public exploit or detection template: none known
Published: 2022-04-11 · updated 2024-12-05
Weakness: CWE-787

Description

## 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.

Affected products

Rubygems Nokogiri: before 1.13.4; 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5 (+137) — fixed in 1.13.4

How to fix

Upgrade to a fixed version: Rubygems Nokogiri 1.13.4. Check the vendor advisory for mitigations.

References

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