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CVE-2020-5268— Subject Confirmation Method not validated in Saml2 Authentication Services for ASP.NET

Quick assessment

Affected
Sustainsys Saml2
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.

Saml2 Authentication services for ASP.NET是一款用于ASP.NET的SAML（安全声明标记语言）身份验证服务。 Saml2 Authentication services for ASP.NET 1.0.2版本和2.0.0版本至2.6.0版本中令牌验证的方法存在安全漏洞。攻击者可利用该漏洞创建登录会话。

CVSS 6.5 · Medium EPSS 1.09% · P64
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I. Basic Information for CVE-2020-5268

Vulnerability Information
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Vulnerability Title
Subject Confirmation Method not validated in Saml2 Authentication Services for ASP.NET
Source: CVE Program / CVE List V5
Vulnerability Description
In Saml2 Authentication Services for ASP.NET versions before 1.0.2, and between 2.0.0 and 2.6.0, there is a vulnerability in how tokens are validated in some cases. Saml2 tokens are usually used as bearer tokens - a caller that presents a token is assumed to be the subject of the token. There is also support in the Saml2 protocol for issuing tokens that is tied to a subject through other means, e.g. holder-of-key where possession of a private key must be proved. The Sustainsys.Saml2 library incorrectly treats all incoming tokens as bearer tokens, even though they have another subject confirmation method specified. This could be used by an attacker that could get access to Saml2 tokens with another subject confirmation method than bearer. The attacker could then use such a token to create a log in session. This vulnerability is patched in versions 1.0.2 and 2.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证算法的不正确实现
Source: CVE Program / CVE List V5
Vulnerability Title
Saml2 Authentication services for ASP.NET 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Saml2 Authentication services for ASP.NET是一款用于ASP.NET的SAML（安全声明标记语言）身份验证服务。 Saml2 Authentication services for ASP.NET 1.0.2版本和2.0.0版本至2.6.0版本中令牌验证的方法存在安全漏洞。攻击者可利用该漏洞创建登录会话。
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
Sustainsys Saml2 < 1.0.2 -

II. Public POCs for CVE-2020-5268

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III. Intelligence Information for CVE-2020-5268

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Patches & Fixes for CVE-2020-5268 (1)

Vendor Advisories for CVE-2020-5268 (1)

Other References for CVE-2020-5268 (2)

IV. Related Vulnerabilities

Same product: Saml2
Same vendor: Sustainsys
Same weakness: CWE-303

V. Comments for CVE-2020-5268

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