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passport-wsfed-saml2 vulnerable to Signature Bypass in SAML2 token

High severity GitHub Reviewed Published Jun 21, 2023 in auth0/passport-wsfed-saml2

Package

npm passport-wsfed-saml2 (npm)

Affected versions

< 3.0.5

Patched versions

3.0.5

Description

Information

Please note that this is not a new disclosure, and is previously reported in our SECURITY-NOTICE.md which we removed in favor of github advisory.

Overview

This vulnerability allows an attacker to impersonate another user and potentially elevate their privileges if the SAML identity provider:

  • signs SAML response and signs assertion

  • does not sign SAML response and signs assertion

Am I affected?

You may be affected if you use SAML2 protocol with passport-wsfed-saml2 versions below 3.0.5 and your SAML identity Provider:

  1. signs SAML response and signs assertion; or
  2. does not sign SAML response and signs assertion

How do I fix it?

You may fix this vulnerability by upgrading your library to version 3.0.5 or above.

Will the fix impact my users?

This fix patches the library that your application runs, but will not impact your users, their current state, or any existing sessions.

References

@mdel93 mdel93 published to auth0/passport-wsfed-saml2 Jun 21, 2023
Published to the GitHub Advisory Database Jun 21, 2023
Reviewed Jun 21, 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
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.245%
(64th percentile)

Weaknesses

CVE ID

CVE-2017-16897

GHSA ID

GHSA-77fw-rf4v-vfp9
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