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CVE-2020-5261— Missing Token Replay Detection

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 2.0.0及之后版本（2.5.0版本已修复）中的身份验证服务（用于ASP.NET）存在安全漏洞，该漏洞源于程序没有正确实现令牌重放检查。攻击者可利用该漏洞绕过身份验证。

CVSS 8.2 · High EPSS 1.50% · P73

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship
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I. Basic Information for CVE-2020-5261

Vulnerability Information
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Vulnerability Title
Missing Token Replay Detection
Source: CVE Program / CVE List V5
Vulnerability Description
Saml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) greater than 2.0.0, and less than version 2.5.0 has a faulty implementation of Token Replay Detection. Token Replay Detection is an important defence in depth measure for Single Sign On solutions. The 2.5.0 version is patched. Note that version 1.0.1 is not affected. It has a correct Token Replay Implementation and is safe to use. Saml2 Authentication services for ASP.NET (NuGet package Sustainsys.Saml2) greater than 2.0.0, and less than version 2.5.0 have a faulty implementation of Token Replay Detection. Token Replay Detection is an important defense measure for Single Sign On solutions. The 2.5.0 version is patched. Note that version 1.0.1 and prior versions are not affected. These versions have a correct Token Replay Implementation and are safe to use.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Saml2 Authentication services for ASP.NET 安全漏洞
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 2.0.0及之后版本（2.5.0版本已修复）中的身份验证服务（用于ASP.NET）存在安全漏洞，该漏洞源于程序没有正确实现令牌重放检查。攻击者可利用该漏洞绕过身份验证。
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 >= 2.0.0, < 2.5.0 -

II. Public POCs for CVE-2020-5261

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III. Intelligence Information for CVE-2020-5261

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Patches & Fixes for CVE-2020-5261 (1)

Vendor Advisories for CVE-2020-5261 (1)

Other References for CVE-2020-5261 (1)

IV. Related Vulnerabilities

Same product: Saml2
Same vendor: Sustainsys
Same weakness: CWE-294

V. Comments for CVE-2020-5261

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