Ruby SAML allows remote Denial of Service (DoS) with compressed SAML responses
Published: March 12, 2025
SECURITY IDENTIFIERS
- CVE: CVE-2025-25293 (NVD)
- GHSA: GHSA-92rq-c8cf-prrq
- Vendor Advisory: https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-92rq-c8cf-prrq
GEM
SEVERITY
CVSS v3.x: 7.5 (High)
PATCHED VERSIONS
~> 1.12.4
>= 1.18.0
DESCRIPTION
Summary
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.
Impact
This issue may lead to remote Denial of Service (DoS).
RELATED
- https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-92rq-c8cf-prrq
- https://github.com/SAML-Toolkits/ruby-saml/commit/acac9e9cc0b9a507882c614f25d41f8b47be349a
- https://github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv
- https://nvd.nist.gov/vuln/detail/CVE-2025-25293
- 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://github.com/advisories/GHSA-92rq-c8cf-prrq