Vulnerability · Published Dec 20, 2021 · Assigned by GitHub_M
CVE-2021-43843Insufficient patch for Regular Expression Denial of Service (ReDoS) to jsx-slack v4.5.1
Medium 5.3
In plain English
A medium-severity uncontrolled resource consumption in jsx-slack from yhatt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | jsx-slack | 4.5.2 | GHSA-hp68-xhvj-x6j6 |
Affected products (as reported)
Weakness: CWE-400, CWE-1333 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6 x_refsource_CONFIRM
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q x_refsource_MISC
- https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc x_refsource_MISC
- https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2 x_refsource_MISC