markdown prior 0.0.0-20230922105210-14b16010c2ee on Go parser.Mmark Extension out-of-bounds

Summaryinfo

A vulnerability has been found in markdown on Go and classified as problematic. This affects an unknown function of the component parser.Mmark Extension. The manipulation leads to out-of-bounds. This vulnerability is referenced as CVE-2023-42821. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in markdown on Go and classified as problematic. This issue affects an unknown part of the component parser.Mmark Extension. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability. The summary by CVE is:

The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.

The weakness was published 09/23/2023 as GHSA-m9xq-6h2j-65r2. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2023-42821 since 09/14/2023. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.0.0-20230922105210-14b16010c2ee eliminates this vulnerability. Applying the patch 14b16010c2ee7ff33a940a541d993bd043a88940 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• markdown

License

• open-source

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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