Improper Verification of Cryptographic Signature in SAML SSO for Ruby - CVE-2025-25292

Vulnerability identifier: #VU105688

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-25292

CWE-ID: CWE-347

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass authentication on the system.

The vulnerability exists due to a parser differential. A remote attacker can execute a Signature Wrapping attack on the target system.

SAML SSO for Ruby
Gitlab Community Edition
GitLab Enterprise Edition
Aspera Enterprise WebApps
Ubuntu
ruby-saml (Ubuntu package)

Install updates from vendor's website.

SAML SSO for Ruby - addressed in versions 1.12.4, 1.18.0
Gitlab Community Edition - addressed in versions 17.7.7, 17.8.5, 17.9.2
Aspera Enterprise WebApps - update to 1.0.1
GitLab Enterprise Edition - addressed in versions 17.7.7, 17.8.5, 17.9.2
ruby-saml (Ubuntu package) - addressed in versions Ubuntu Pro, 1.15.0-1ubuntu0.24.10.2

• 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/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv
• https://github.com/SAML-Toolkits/ruby-saml/commit/e76c5b36bac40aedbf1ba7ffaaf495be63328cd9
• https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97
• 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/SAML-Toolkits/ruby-saml/security/advisories/GHSA-754f-8gm6-c4r2

• Multiple vulnerabilities in SAML SSO for Ruby
• Multiple vulnerabilities in GitLab Community Edition (CE) and Enterprise Edition (EE)
• Ubuntu update for ruby-saml
• Multiple vulnerabilities in IBM Aspera Enterprise WebApps