Vulnerability Description
jsx-slack is a package for building JSON objects for Slack block kit surfaces from JSX. The maintainers found the patch for CVE-2021-43838 in jsx-slack v4.5.1 is insufficient tfor protection from a Regular Expression Denial of Service (ReDoS) attack. If an attacker can put a lot of JSX elements into `<blockquote>` tag _with including multibyte characters_, an internal regular expression for escaping characters may consume an excessive amount of computing resources. v4.5.1 passes the test against ASCII characters but misses the case of multibyte characters. jsx-slack v4.5.2 has updated regular expressions for escaping blockquote characters to prevent catastrophic backtracking. It is also including an updated test case to confirm rendering multiple tags in `<blockquote>` with multibyte characters.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Jsx-Slack Project | Jsx-Slack | < 4.5.2 |
Related Weaknesses (CWE)
References
- https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ePatchThird Party Advisory
- https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2Release NotesThird Party Advisory
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248qExploitPatchThird Party Advisory
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6ExploitPatchThird Party Advisory
- https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ePatchThird Party Advisory
- https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2Release NotesThird Party Advisory
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248qExploitPatchThird Party Advisory
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6ExploitPatchThird Party Advisory
FAQ
What is CVE-2021-43843?
CVE-2021-43843 is a vulnerability with a CVSS score of 5.3 (MEDIUM). jsx-slack is a package for building JSON objects for Slack block kit surfaces from JSX. The maintainers found the patch for CVE-2021-43838 in jsx-slack v4.5.1 is insufficient tfor protection from a Re...
How severe is CVE-2021-43843?
CVE-2021-43843 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-43843?
Check the references section above for vendor advisories and patch information. Affected products include: Jsx-Slack Project Jsx-Slack.