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CVE-2021-39171— Unlimited transforms allowed for signed nodes

Quick assessment

Affected
node-saml passport-saml
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.

Passport-SAML是Passport的SAML 2.0身份验证提供程序，Node.js 身份验证库。 Passport-SAML 存在资源管理错误漏洞，该漏洞源于在3.1.0版本之前，恶意SAML负载可能需要消耗大量系统资源来处理的转换。攻击者可利用该漏洞导致服务减少或被拒绝。

CVSS 5.3 · Medium EPSS 1.32% · P70
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I. Basic Information for CVE-2021-39171

Vulnerability Information
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Vulnerability Title
Unlimited transforms allowed for signed nodes
Source: CVE Program / CVE List V5
Vulnerability Description
Passport-SAML is a SAML 2.0 authentication provider for Passport, the Node.js authentication library. Prior to version 3.1.0, a malicious SAML payload can require transforms that consume significant system resources to process, thereby resulting in reduced or denied service. This would be an effective way to perform a denial-of-service attack. This has been resolved in version 3.1.0. The resolution is to limit the number of allowable transforms to 2.
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
Passport-SAML 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Passport-SAML是Passport的SAML 2.0身份验证提供程序，Node.js 身份验证库。 Passport-SAML 存在资源管理错误漏洞，该漏洞源于在3.1.0版本之前，恶意SAML负载可能需要消耗大量系统资源来处理的转换。攻击者可利用该漏洞导致服务减少或被拒绝。
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
node-saml passport-saml < 3.1.0 -

II. Public POCs for CVE-2021-39171

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III. Intelligence Information for CVE-2021-39171

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Patches & Fixes for CVE-2021-39171 (1)

Vendor Advisories for CVE-2021-39171 (1)

IV. Related Vulnerabilities

Same product: passport-saml
Same vendor: node-saml
Same weakness: CWE-400

V. Comments for CVE-2021-39171

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