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CVE-2021-32723— Regular Expression Denial of Service (ReDoS) in Prism

Quick assessment

Affected
PrismJS prism
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.

Prism是美国Prism个人开发者的一个应用软件。是一种轻量级的，可扩展的语法突出显示工具。 Prism 1.24.0之前版本存在安全漏洞，该漏洞源于当Prism用于突出显示不受信任的文本时，攻击者可利用该漏洞精心制作一个字符串，需要非常非常长的时间来显示。

CVSS 7.4 · High EPSS 1.43% · P71

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-32723

Vulnerability Information
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Vulnerability Title
Regular Expression Denial of Service (ReDoS) in Prism
Source: CVE Program / CVE List V5
Vulnerability Description
Prism is a syntax highlighting library. Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS). When Prism is used to highlight untrusted (user-given) text, an attacker can craft a string that will take a very very long time to highlight. This problem has been fixed in Prism v1.24. As a workaround, do not use ASCIIDoc or ERB to highlight untrusted text. Other languages are not affected and can be used to highlight untrusted text.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
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
Prism 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Prism是美国Prism个人开发者的一个应用软件。是一种轻量级的，可扩展的语法突出显示工具。 Prism 1.24.0之前版本存在安全漏洞，该漏洞源于当Prism用于突出显示不受信任的文本时，攻击者可利用该漏洞精心制作一个字符串，需要非常非常长的时间来显示。
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
PrismJS prism < 1.24 -

II. Public POCs for CVE-2021-32723

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III. Intelligence Information for CVE-2021-32723

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Patches & Fixes for CVE-2021-32723 (2)

Vendor Advisories for CVE-2021-32723 (2)

IV. Related Vulnerabilities

Same product: prism
Same vendor: PrismJS
Same weakness: CWE-400

V. Comments for CVE-2021-32723

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