CVE-2025-25291

Description

ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. An authentication bypass vulnerability was found in ruby-saml prior to versions 1.12.4 and 1.18.0 due to a parser differential. ReXML and Nokogiri parse XML differently; the parsers can generate entirely different document structures from the same XML input. That allows an attacker to be able to execute a Signature Wrapping attack. This issue may lead to authentication bypass. Versions 1.12.4 and 1.18.0 fix the issue.

References

https://www.bleepingcomputer.com/news/security/gitlab-patches-critical-authentication-bypass-vulnerabilities/

https://thehackernews.com/2025/03/github-uncovers-new-ruby-saml.html

https://securityaffairs.com/175370/security/gitlab-addressed-critical-flaws-in-ce-and-ee.html

https://security.netapp.com/advisory/ntap-20250314-0010/

https://github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv

https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-4vc4-m8qh-g8jm

https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0

https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4

https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97

https://github.com/SAML-Toolkits/ruby-saml/commit/e76c5b36bac40aedbf1ba7ffaaf495be63328cd9

https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials

https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4