Vulnerability Details CVE-2021-43843
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 67.3%
CVSS Severity
CVSS v3 Score 5.3
CVSS v2 Score 5.0
References
- https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc
- https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6
- https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc
- https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6
Products affected by CVE-2021-43843
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.1.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.10.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.10.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.10.2
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.11.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.11.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.12.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.2.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.3.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.4.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.4.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.4.2
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.4.3
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.5.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.5.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.6.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.7.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.8.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.8.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.9.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.9.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:0.9.2
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.0.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.1.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.2.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.3.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.3.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.4.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.5.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.5.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.6.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:1.7.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:2.0.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:2.1.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:2.2.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:2.2.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:2.3.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:2.4.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:2.5.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:2.5.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:2.6.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:3.0.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.0.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.1.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.2.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.2.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.3.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.4.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.4.1
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.4.2
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.4.3
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.5.0
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cpe:2.3:a:jsx-slack_project:jsx-slack:4.5.1