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OmniAuth-SAML authentication bypass via incorrect XML canonicalization and DOM traversal

High severity GitHub Reviewed Published Jul 5, 2019 to the GitHub Advisory Database • Updated Aug 29, 2023

Package

bundler omniauth-saml (RubyGems)

Affected versions

< 1.10.0

Patched versions

1.10.0

Description

OmniAuth OmniAuth-SAML 1.9.0 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.

References

Published to the GitHub Advisory Database Jul 5, 2019
Reviewed Jun 16, 2020
Last updated Aug 29, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS score

0.966%
(84th percentile)

Weaknesses

CVE ID

CVE-2017-11430

GHSA ID

GHSA-94hm-8q65-rmxm

Source code

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