PT-2025-11127 · Ruby-Saml+3 · Ruby-Saml+3

Ahacker1 + 1 · Published 2025-03-12 · Updated 2025-09-26 · CVE-2025-25291

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions ruby-saml versions prior to 1.12.4 and 1.18.0

Description 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. This allows an attacker to execute a Signature Wrapping attack, which may lead to authentication bypass.

Recommendations To resolve the issue, update ruby-saml to version 1.12.4 or 1.18.0, or later. As a temporary workaround, consider disabling the checkPassword() function or restricting access to the vulnerable ruby-saml module until a patch is available. Avoid using the SAMLResponse parameter in the affected API endpoint until the issue is resolved.

Exploit

Fix

DoS

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-436

CWE-347

Related Identifiers

BDU:2025-02818

BIT-GITLAB-2025-25291

CVE-2025-25291

DLA-4115-1

GHSA-4VC4-M8QH-G8JM

GHSA-HW46-3HMR-X9XV

USN-7409-1

Affected Products

Debian

Linuxmint

Ubuntu

Ruby-Saml

References · 96

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/25xxx/CVE-2025-25291.json · Exploit
• 🔥 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/ruby-saml/CVE-2025-25291.yml · Exploit
• 🔥 https://portswigger.net/research/saml-roulette-the-hacker-always-wins · Exploit
• 🔥 https://github.blog/security/sign-in-as-anyone-bypassing-saml-sso-authentication-with-parser-differentials · Exploit
• https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97 · Patch
• https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-4vc4-m8qh-g8jm · Vendor Advisory
• https://github.com/SAML-Toolkits/ruby-saml/commit/e76c5b36bac40aedbf1ba7ffaaf495be63328cd9 · Patch
• https://github.com/omniauth/omniauth-saml/security/advisories/GHSA-hw46-3hmr-x9xv · Vendor Advisory
• https://about.gitlab.com/releases/2025/03/12/patch-release-gitlab-17-9-2-released · Patch
• https://osv.dev/vulnerability/DLA-4115-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7409-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-25291 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-25291 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-02818 · Security Note
• https://osv.dev/vulnerability/CVE-2025-25291 · Vendor Advisory