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CVE-2021-43843— Insufficient patch for Regular Expression Denial of Service (ReDoS) to jsx-slack v4.5.1

Quick assessment

Affected
yhatt jsx-slack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

jsx-slack是从JSX为Slack 块套件表面构建 JSON 对象。 jsx-slack 存在安全漏洞，该漏洞源于 CVE-2021-43838 补丁不足以防止正则表达式CNNVD-202112-2019 标签中，那么内部用于转义字符的正则表达式可能会消耗过多的计算资源。

CVSS 5.3 · Medium EPSS 1.92% · P79

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-43843

Vulnerability Information
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Vulnerability Title
Insufficient patch for Regular Expression Denial of Service (ReDoS) to jsx-slack v4.5.1
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
jsx-slack 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
jsx-slack是从JSX为Slack 块套件表面构建 JSON 对象。 jsx-slack 存在安全漏洞，该漏洞源于 CVE-2021-43838 补丁不足以防止正则表达式CNNVD-202112-2019 标签中，那么内部用于转义字符的正则表达式可能会消耗过多的计算资源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
yhatt jsx-slack < 4.5.2 -

II. Public POCs for CVE-2021-43843

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III. Intelligence Information for CVE-2021-43843

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Patches & Fixes for CVE-2021-43843 (1)

Vendor Advisories for CVE-2021-43843 (2)

Other References for CVE-2021-43843 (1)

IV. Related Vulnerabilities

Same product: jsx-slack
Same vendor: yhatt
Same weakness: CWE-400

V. Comments for CVE-2021-43843

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