CVE-2021-43838

描述

jsx-slack v4.5.1 and earlier versions are vulnerable to a regular expression denial-of-service (ReDoS) attack. ### Impact If attacker can put a lot of JSX elements into `<blockquote>` tag, an internal regular expression for escaping characters may consume an excessive amount of computing resources. ```javascript /** @jsxImportSource jsx-slack */ import { Section } from 'jsx-slack' console.log( <Section> <blockquote> {[...Array(40)].map((_, i) => ( <p>{i + 1}</p> ))} </blockquote> </Section> ) ``` ### Patches _See also: https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6_ jsx-slack v4.5.2 has updated regular expressions to prevent catastrophic backtracking. jsx-slack v4.5.1 also had patched a workaround. It has no problems to contents with ASCII characters, but _still vulnerable to contents with multibyte characters_. (https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d) ### References - https://nvd.nist.gov/vuln/detail/CVE-2021-43838 - https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d ### Credits Thanks to @hieki for finding out this vulnerability.

如何修補 CVE-2021-43838

要修補 CVE-2021-43838,請將受影響套件升級到下列已修補版本。

• —升級至 4.5.1 或更新版本

CVE-2021-43838 正在被利用嗎?

低 — EPSS 為 1.4%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 4.5.1

CVSS 分數