CVE-2021-43843

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Summary

CVECVE-2021-43843
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-12-20 22:15:00 UTC
Updated2022-08-09 13:27:00 UTC
Descriptionjsx-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.

Risk And Classification

Problem Types: NVD-CWE-Other

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Jsx-slack Project Jsx-slack All All All All

References

ReferenceSourceLinkTags
Release v4.5.2 · yhatt/jsx-slack · GitHub MISC github.com
Insufficient patch for Regular Expression Denial of Service (ReDoS) to jsx-slack v4.5.1 · Advisory · yhatt/jsx-slack · GitHub CONFIRM github.com
Prevent catastrophic backtracking in blockquote escape replacer · yhatt/jsx-slack@46bc883 · GitHub MISC github.com
Regular Expression Denial of Service (ReDoS) in jsx-slack · Advisory · yhatt/jsx-slack · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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