Description
ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. Prior to versions 1.12.4 and 1.18.0, ruby-saml is susceptible to remote Denial of Service (DoS) with compressed SAML responses. ruby-saml uses zlib to decompress SAML responses in case they're compressed. It is possible to bypass the message size check with a compressed assertion since the message size is checked before inflation and not after. This issue may lead to remote Denial of Service (DoS). Versions 1.12.4 and 1.18.0 fix the issue.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
SAML-Toolkits ruby-saml
< 1.12.4affected>= 1.13.0, < 1.18.0affected
References
- https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-92rq-c8cf-prrq ↗
- https://github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv ↗
- https://github.com/SAML-Toolkits/ruby-saml/commit/acac9e9cc0b9a507882c614f25d41f8b47be349a ↗
- https://github.com/SAML-Toolkits/ruby-saml/commit/e2da4c6dae7dc01a4d9cd221395140a67e2b3eb1 ↗
- https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released ↗
- https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials ↗
- https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4 ↗
- https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0 ↗
- https://securitylab.github.com/advisories/GHSL-2024-355_ruby-saml ↗
- https://security.netapp.com/advisory/ntap-20250314-0008/ ↗
- https://lists.debian.org/debian-lts-announce/2025/04/msg00011.html ↗