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CVE-2021-21267— Regular Expression Denial-of-Service in npm schema-inspector

Quick assessment

Affected
schema-inspector schema-inspector
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.

Npm Schema-Inspector是美国 （Npm）公司的一个应用程序。一个用于清理和验证JS对象的开源工具。 npm schema-inspector before version 2.0.0 存在资源管理错误漏洞，该漏洞源于邮件地址验证是容易受到拒绝服务攻击。

CVSS 7.5 · High EPSS 2.09% · P81

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-21267

Vulnerability Information
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Vulnerability Title
Regular Expression Denial-of-Service in npm schema-inspector
Source: CVE Program / CVE List V5
Vulnerability Description
Schema-Inspector is an open-source tool to sanitize and validate JS objects (npm package schema-inspector). In before version 2.0.0, email address validation is vulnerable to a denial-of-service attack where some input (for example `a@0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.`) will freeze the program or web browser page executing the code. This affects any current schema-inspector users using any version to validate email addresses. Users who do not do email validation, and instead do other types of validation (like string min or max length, etc), are not affected. Users should upgrade to version 2.0.0, which uses a regex expression that isn't vulnerable to ReDoS.
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: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
Npm Schema-Inspector 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Npm Schema-Inspector是美国 （Npm）公司的一个应用程序。一个用于清理和验证JS对象的开源工具。 npm schema-inspector before version 2.0.0 存在资源管理错误漏洞，该漏洞源于邮件地址验证是容易受到拒绝服务攻击。
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
schema-inspector schema-inspector < 2.0.0 -

II. Public POCs for CVE-2021-21267

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III. Intelligence Information for CVE-2021-21267

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Vendor Advisories for CVE-2021-21267 (1)

Other References for CVE-2021-21267 (1)

IV. Related Vulnerabilities

Same product: schema-inspector
Same weakness: CWE-400

V. Comments for CVE-2021-21267

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