CVE-2023-22491
gatsby-transformer-remark has possible unsanitized JavaScript code injection
Impact
### Impact The gatsby-transformer-remark plugin prior to versions 5.25.1 and 6.3.2 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 in gatsby-transformer-remark when passing input in data mode (querying MarkdownRemark 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 by or added into a file processed by gatsby-transformer-remark. The following payload demonstrates a vulnerable configuration: ``` ---js ((require("child_process")).execSync("id >> /tmp/rce")) --- ``` ### Patches A patch has been introduced in `gatsby-transformer-remark@5.25.1` and `gatsby-transformer-remark@6.3.2` 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 MarkdownRemark input is attempting to use the Frontmatter engine. ### Workarounds If an older version of `gatsby-transformer-remark` 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.** ### For more information Email us at [security@gatsbyjs.com](mailto:security@gatsbyjs.com).
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | gatsby-transformer-remark | >= 6.0.0, < 6.3.2 | 6.3.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Gatsbyjs | Gatsby-Transformer-Remark | before 5.25.1 from 6.0.0 before 6.3.2 |