CVE-2021-43843

描述

We found the patch for CVE-2021-43838 in jsx-slack v4.5.1 is insufficient to save from Regular Expression Denial of Service (ReDoS) attack. This vulnerability affects to jsx-slack v4.5.1 and earlier versions. ### Impact If 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. ```javascript /** @jsxImportSource jsx-slack */ import { Section } from 'jsx-slack' console.log( <Section> <blockquote> {[...Array(40)].map(() => ( <p>亜</p> ))} </blockquote> </Section> ) ``` v4.5.1 has released by passing the test against ASCII characters but missed the case of multibyte characters. https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q ### Patches 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. ### References - https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc ### Credits Thanks to @hieki for finding out this vulnerability.

如何修補 CVE-2021-43843

要修補 CVE-2021-43843,請將受影響套件升級到下列已修補版本。

• —升級至 4.5.2 或更新版本

CVE-2021-43843 正在被利用嗎?

低 — EPSS 為 1.9%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 4.5.2

CVSS 分數