CVE-2020-26290

Critical security issues in XML encoding in Dex

Severity Score

9.6

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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).

Dex es un proveedor federado de OpenID Connect escrito en Go. En Dex versión anterior a 2.27.0, presenta un conjunto crítico de vulnerabilidades que impacta a usuarios que aprovechan el conector SAML. Las vulnerabilidades permiten una posible omisión de firmas debido a problemas con la codificación XML en la biblioteca Go subyacente. Las vulnerabilidades han sido abordadas en la versión 2.27.0, mediante el uso de xml-roundtrip-validator de Mattermost (consulte las referencias relacionadas)

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-10-01 CVE Reserved
2020-12-28 CVE Published
2023-09-13 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-347: Improper Verification of Cryptographic Signature

CAPEC

References (8)

URL	Tag	Source
https://github.com/dexidp/dex/releases/tag/v2.27.0	Third Party Advisory
https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5	Third Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md	Not Applicable
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md	Not Applicable
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md	Not Applicable
https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7	Not Applicable
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities	Not Applicable

URL	Date	SRC

URL	Date	SRC
https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8	2020-12-30

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linuxfoundation Search vendor "Linuxfoundation"		Dex Search vendor "Linuxfoundation" for product "Dex"				< 2.27.0 Search vendor "Linuxfoundation" for product "Dex" and version " < 2.27.0"		-		Affected