CVE-2023-42821
Last modified
CVE-2023-42821 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.04% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gomarkdown | Markdown | All versions |
References
- https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2Exploit, Vendor Advisory
- https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2Exploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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