SAML-Toolkits ruby-saml up to 1.12.3/1.17.x Message Size resource consumption

Summaryinfo

A vulnerability categorized as problematic has been discovered in SAML-Toolkits ruby-saml up to 1.12.3/1.17.x. This impacts an unknown function of the component Message Size Handler. Such manipulation leads to resource consumption. This vulnerability is traded as CVE-2025-25293. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in SAML-Toolkits ruby-saml up to 1.12.3/1.17.x. Affected by this issue is an unknown functionality of the component Message Size Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2025-25293 since 02/06/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 233790 (Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 : RubySAML vulnerabilities (USN-7409-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.12.4 or 1.18.0 eliminates this vulnerability. The upgrade is hosted for download at about.gitlab.com. Applying the patch acac9e9cc0b9a507882c614f25d41f8b47be349a is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (233790) and EUVD (EUVD-2025-6413). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Programming Language Software

Vendor

• SAML-Toolkits

Name

• ruby-saml

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.12.0
• 1.12.1
• 1.12.2
• 1.12.3
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17

License

• open-source

Website

• Product: https://github.com/SAML-Toolkits/ruby-saml/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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