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CVE-2024-45409— The Ruby SAML library vulnerable to a SAML authentication bypass via Incorrect XPath selector

Quick assessment

Affected
SAML-Toolkits ruby-saml
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.

Ruby SAML是SAML-Toolkits开源的一个 SAML 授权客户端的实现。 Ruby SAML存在数据伪造问题漏洞，该漏洞源于Ruby-SAML无法正确验证SAML响应的签名，从而允许攻击者以任意用户身份登录易受攻击的系统。

CVSS 10.0 · Critical EPSS 10.68% · P96

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2024-45409

Vulnerability Information
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Vulnerability Title
The Ruby SAML library vulnerable to a SAML authentication bypass via Incorrect XPath selector
Source: CVE Program / CVE List V5
Vulnerability Description
The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.13.0 <= 1.16.0 does not properly verify the signature of the SAML Response. An unauthenticated attacker with access to any signed saml document (by the IdP) can thus forge a SAML Response/Assertion with arbitrary contents. This would allow the attacker to log in as arbitrary user within the vulnerable system. This vulnerability is fixed in 1.17.0 and 1.12.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Ruby SAML 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ruby SAML是SAML-Toolkits开源的一个 SAML 授权客户端的实现。 Ruby SAML存在数据伪造问题漏洞，该漏洞源于Ruby-SAML无法正确验证SAML响应的签名，从而允许攻击者以任意用户身份登录易受攻击的系统。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
SAML-Toolkits ruby-saml < 1.12.3 -

II. Public POCs for CVE-2024-45409

# POC Description Source Link Shenlong Link
1 Ruby-SAML / GitLab Authentication Bypass (CVE-2024-45409) exploit https://github.com/synacktiv/CVE-2024-45409 POC Details
2 The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.13.0 <= 1.16.0 does not properly verify the signature of the SAML Response. https://github.com/projectdiscovery/nuclei-templates/blob/main/code/cves/2024/CVE-2024-45409.yaml POC Details
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Qwen3.6-35B-A3B · 13871 chars
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III. Intelligence Information for CVE-2024-45409

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IV. Related Vulnerabilities

Same product: ruby-saml
Same vendor: SAML-Toolkits
Same weakness: CWE-347

V. Comments for CVE-2024-45409

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