CVE-2020-26290 Information

Description

Dex is a federated OpenID Connect provider written in Go. In Dex before version 2.27.0 there is a critical set of vulnerabilities which impacts users leveraging the SAML connector. The vulnerabilities enables potential signature bypass due to issues with XML encoding in the underlying Go library. The vulnerabilities have been addressed in version 2.27.0 by using the xml-roundtrip-validator from Mattermost (see related references).

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Reference

https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5 https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ https://github.com/dexidp/dex/releases/tag/v2.27.0 https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8 https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7 https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.6