CVE-2021-43843
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.
How to fix
- jsx-slack_project jsx-slack4.5.2 or later
- jsx-slack4.5.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jsx-slack_project jsx-slack | v < 4.5.2 | 4.5.2 |
| jsx-slacknpm | v < 4.5.2 | 4.5.2 |
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Attack Surface Management
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