CVE-2020-26290

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 v3.0 9.6 CRITICAL
CVSS v2.0 6.8 MEDIUM

9.6^/10

CVSS v3.0 : CRITICAL

Vector :

Exploitability : 2.8 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

6.8^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:P/I:P/A:P

Exploitability : 8.6 / Impact : 6.4

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
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 Third Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md	Not Applicable Third Party Advisory
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/	Not Applicable Third Party Advisory
https://github.com/dexidp/dex/releases/tag/v2.27.0	Third Party Advisory
https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8	Patch Third Party Advisory
https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7	Not Applicable Third Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md	Not Applicable Third Party Advisory

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Configurations

Configuration 1 (hide)

cpe:2.3:a:linuxfoundation:dex:*:*:*:*:*:*:*:*

Information

Published : 2020-12-28 12:15

Updated : 2020-12-30 07:12

NVD link : CVE-2020-26290

Mitre link : CVE-2020-26290

JSON object : View

CWE

CWE-347

Improper Verification of Cryptographic Signature

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Products Affected

linuxfoundation

dex

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