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CVE-2023-41890— Sustainsys.Saml2 Insufficient Identity Provider Issuer Validation

Quick assessment

Affected
Sustainsys Saml2
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SAML是Ross Kinder个人开发者的一个包含了 golang 中 saml 标准的部分实现的库。即允许第三方对您的用户进行身份验证，或允许第三者依靠我们对其用户进行身份认证。 Sustainsys Saml2 1.0.3之前版本、2.0.0 到 2.9.1版本存在安全漏洞，该漏洞源于在处理响应时，身份提供商的颁发者未得到充分验证，这可能允许恶意身份提供者制作 Saml2 响应，该响应的处理就像是由另一个身份提供者发出的一样，攻击者利用该漏洞可能在处理来自提供商的响应时存储另一个身份提供商的状态。

CVSS 7.5 · High EPSS 0.75% · P54

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship
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I. Basic Information for CVE-2023-41890

Vulnerability Information
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Vulnerability Title
Sustainsys.Saml2 Insufficient Identity Provider Issuer Validation
Source: CVE Program / CVE List V5
Vulnerability Description
Sustainsys.Saml2 library adds SAML2P support to ASP.NET web sites, allowing the web site to act as a SAML2 Service Provider. Prior to versions 1.0.3 and 2.9.2, when a response is processed, the issuer of the Identity Provider is not sufficiently validated. This could allow a malicious identity provider to craft a Saml2 response that is processed as if issued by another identity provider. It is also possible for a malicious end user to cause stored state intended for one identity provider to be used when processing the response from another provider. An application is impacted if they rely on any of these features in their authentication/authorization logic: the issuer of the generated identity and claims; or items in the stored request state (AuthenticationProperties). This issue is patched in versions 2.9.2 and 1.0.3. The `AcsCommandResultCreated` notification can be used to add the validation required if an upgrade to patched packages is not possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选名称进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
SAML 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SAML是Ross Kinder个人开发者的一个包含了 golang 中 saml 标准的部分实现的库。即允许第三方对您的用户进行身份验证，或允许第三者依靠我们对其用户进行身份认证。 Sustainsys Saml2 1.0.3之前版本、2.0.0 到 2.9.1版本存在安全漏洞，该漏洞源于在处理响应时，身份提供商的颁发者未得到充分验证，这可能允许恶意身份提供者制作 Saml2 响应，该响应的处理就像是由另一个身份提供者发出的一样，攻击者利用该漏洞可能在处理来自提供商的响应时存储另一个身份提供商的状态。
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 < 1.0.3 -

II. Public POCs for CVE-2023-41890

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 9291 chars
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III. Intelligence Information for CVE-2023-41890

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Vendor Advisories for CVE-2023-41890 (1)

Other References for CVE-2023-41890 (2)

IV. Related Vulnerabilities

Same product: Saml2
Same vendor: Sustainsys
Same weakness: CWE-289

V. Comments for CVE-2023-41890

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