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crewjam/saml vulnerable to signature bypass via multiple Assertion elements due to improper authentication

Critical severity GitHub Reviewed Published Nov 28, 2022 in crewjam/saml • Updated Feb 9, 2023

Package

gomod github.com/crewjam/saml (Go)

Affected versions

< 0.4.9

Patched versions

0.4.9

Description

Impact

The crewjam/saml go library is vulnerable to an authentication bypass when processing SAML responses containing multiple Assertion elements.

Patches

This issue has been corrected in version 0.4.9.

Credit

This issue was reported by Felix Wilhelm from Google Project Zero.

References

@crewjam crewjam published to crewjam/saml Nov 28, 2022
Published by the National Vulnerability Database Nov 28, 2022
Published to the GitHub Advisory Database Nov 29, 2022
Reviewed Nov 29, 2022
Last updated Feb 9, 2023

Severity

Critical

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
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS score

0.564%
(78th percentile)

Weaknesses

CVE ID

CVE-2022-41912

GHSA ID

GHSA-j2jp-wvqg-wc2g

Source code

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