CVE-2025-25292: Ruby SAML allows a SAML authentication bypass due to namespace handling (parser differential)
(updated )
An authentication bypass vulnerability was found in ruby-saml 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.
References
- about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released
- github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials
- github.com/SAML-Toolkits/ruby-saml
- github.com/SAML-Toolkits/ruby-saml/commit/e76c5b36bac40aedbf1ba7ffaaf495be63328cd9
- github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97
- github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4
- github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0
- github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-754f-8gm6-c4r2
- github.com/advisories/GHSA-754f-8gm6-c4r2
- github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv
- github.com/rubysec/ruby-advisory-db/blob/master/gems/ruby-saml/CVE-2025-25292.yml
- news.ycombinator.com/item?id=43374519
- nvd.nist.gov/vuln/detail/CVE-2025-25292
- portswigger.net/research/saml-roulette-the-hacker-always-wins
- security.netapp.com/advisory/ntap-20250314-0009
Code Behaviors & Features
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