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Critical security issues in XML encoding in github.com/dexidp/dex

Critical severity GitHub Reviewed Published Dec 14, 2020 in dexidp/dex • Updated Oct 2, 2023

Package

gomod github.com/dexidp/dex (Go)

Affected versions

< 2.27.0

Patched versions

2.27.0
gomod github.com/russellhaering/goxmldsig (Go)
< 1.1.0
1.1.0

Description

Impact

The following vulnerabilities have been disclosed, which impact users leveraging the SAML connector:

Signature Validation Bypass (CVE-2020-15216): GHSA-q547-gmf8-8jr7

encoding/xml instabilities:

Patches

Immediately update to Dex v2.27.0.

Workarounds

There are no known workarounds.

References

@justaugustus justaugustus published to dexidp/dex Dec 14, 2020
Reviewed May 21, 2021
Published to the GitHub Advisory Database Dec 20, 2021
Last updated Oct 2, 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
Required
Scope
Changed
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:R/S:C/C:H/I:H/A:N

EPSS score

0.322%
(70th percentile)

Weaknesses

CVE ID

CVE-2020-26290

GHSA ID

GHSA-m9hp-7r99-94h5

Source code

No known source code

Credits

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