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XML Processing error in github.com/crewjam/saml

Critical severity GitHub Reviewed Published Dec 14, 2020 in crewjam/saml • Updated Feb 14, 2023

Package

gomod github.com/crewjam/saml (Go)

Affected versions

< 0.4.3

Patched versions

0.4.3

Description

Impact

There are three vulnerabilities in the go encoding/xml package that can allow an attacker to forge part of a signed XML document. For details on this vulnerability see xml-roundtrip-validator

Patches

In version 0.4.3, all XML input is validated prior to being parsed.

References

@crewjam crewjam published to crewjam/saml Dec 14, 2020
Reviewed May 21, 2021
Published to the GitHub Advisory Database Jun 23, 2021
Last updated Feb 14, 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
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

1.251%
(86th percentile)

Weaknesses

CVE ID

CVE-2020-27846

GHSA ID

GHSA-4hq8-gmxx-h6w9

Source code

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