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CVE-2021-43838— Regular Expression Denial of Service (ReDoS) in jsx-slack

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，该漏洞源于软件针对正则表达式缺少有效的处理和过滤，用户容易受到正则表达式拒绝服务(ReDoS)攻击。如果攻击者可利用该漏洞可以将大量JSX元素放入标记中，用于转义字符的内部正则表达式可能会消耗过多的计算资源。

CVSS 5.3 · Medium EPSS 1.38% · P70

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-43838

Vulnerability Information
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Vulnerability Title
Regular Expression Denial of Service (ReDoS) in jsx-slack
Source: CVE Program / CVE List V5
Vulnerability Description
jsx-slack is a library for building JSON objects for Slack Block Kit surfaces from JSX. In versions prior to 4.5.1 users are vulnerable to a regular expression denial-of-service (ReDoS) attack. 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. jsx-slack v4.5.1 has patched to a regex for escaping blockquote characters. Users are advised to upgrade as soon as possible.
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，该漏洞源于软件针对正则表达式缺少有效的处理和过滤，用户容易受到正则表达式拒绝服务(ReDoS)攻击。如果攻击者可利用该漏洞可以将大量JSX元素放入标记中，用于转义字符的内部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 < 4.5.1 -

II. Public POCs for CVE-2021-43838

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III. Intelligence Information for CVE-2021-43838

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Patches & Fixes for CVE-2021-43838 (1)

Vendor Advisories for CVE-2021-43838 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-43838

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