CVE-2025-25293: ruby-saml vulnerable to Remote Denial of Service (DoS) with compressed SAML responses
First published: Wed Mar 12 2025(Updated: )
### 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).
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ruby-saml | <1.12.4<1.18.0 | |
| rubygems/ruby-saml | >=1.13.0<1.18.0 | 1.18.0 |
| rubygems/ruby-saml | <1.12.4 | 1.12.4 |
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Reference Links
- 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://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.12.4
- https://github.com/SAML-Toolkits/ruby-saml/releases/tag/v1.18.0
- https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released
- https://nvd.nist.gov/vuln/detail/CVE-2025-25293
- https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials
- https://github.com/advisories/GHSA-92rq-c8cf-prrq (Advisory)
Frequently Asked Questions
What is the severity of CVE-2025-25293?
CVE-2025-25293 has a high severity rating due to its potential for remote Denial of Service (DoS).
How do I fix CVE-2025-25293?
To fix CVE-2025-25293, upgrade ruby-saml to version 1.18.0 or later.
What systems are affected by CVE-2025-25293?
CVE-2025-25293 affects ruby-saml versions from 1.13.0 up to 1.18.0 and below version 1.12.4.
What type of attack does CVE-2025-25293 facilitate?
CVE-2025-25293 facilitates a remote Denial of Service (DoS) attack using compressed SAML responses.
Is there a workaround for CVE-2025-25293?
Currently, the only reliable workaround for CVE-2025-25293 is to update to the fixed versions of ruby-saml.
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