CVE-2022-25863 – gatsby-plugin-mdx

Package

Manager: npm
Name: gatsby-plugin-mdx
Vulnerable Version: >=0 <2.14.1 || >=3.0.0 <3.15.2

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00676 pctl0.70581

Details

Unsanitized JavaScript code injection possible in gatsby-plugin-mdx ### Impact The gatsby-plugin-mdx plugin prior to versions 3.15.2 and 2.14.1 passes input through to the `gray-matter` npm package, which is vulnerable to JavaScript injection in its default configuration, unless input is sanitized. The vulnerability is present when passing input in both webpack (MDX files in `src/pages` or MDX file imported as component in frontend / React code) and data mode (querying MDX nodes via GraphQL). Injected JavaScript executes in the context of the build server. To exploit this vulnerability untrusted/unsanitized input would need to be sourced or added into an MDX file. The following MDX payload demonstrates a vulnerable configuration: ``` ---js ((require("child_process")).execSync("id >> /tmp/rce")) --- ``` ### Patches A patch has been introduced in `gatsby-plugin-mdx@3.15.2` and `gatsby-plugin-mdx@2.14.1` which mitigates the issue by disabling the `gray-matter` JavaScript Frontmatter engine. The patch introduces a new option, `JSFrontmatterEngine` which is set to `false` by default. When setting `JSFrontmatterEngine` to `true`, input passed to `gatsby-plugin-mdx` must be sanitized before processing to avoid a security risk. Warnings are displayed when enabling `JSFrontmatterEngine` to `true` or if it appears that the MDX input is attempting to use the Frontmatter engine. ### Workarounds If an older version of `gatsby-plugin-mdx` must be used, input passed into the plugin should be sanitized ahead of processing. **We encourage projects to upgrade to the latest major release branch for all Gatsby plugins to ensure the latest security updates and bug fixes are received in a timely manner.** ### Credits We would like to thank Snyk [snyk.io] for initially bringing the issue to our attention, as well as Feng Xiao and Zhongfu Su, who reported the issue to Snyk. ### For more information Email us at [security@gatsbyjs.com](mailto:security@gatsbyjs.com).

Metadata

Created: 2022-06-03T22:32:06Z
Modified: 2022-06-06T18:59:37Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/06/GHSA-mj46-r4gr-5x83/GHSA-mj46-r4gr-5x83.json
CWE IDs: ["CWE-502"]
Alternative ID: GHSA-mj46-r4gr-5x83
Finding: F096
Auto approve: 1