Published: 28/12/2020 Updated: 30/12/2020

CVSS v2 Base Score: 6.8 | Impact Score: 6.4 | Exploitability Score: 8.6

CVSS v3 Base Score: 9.6 | Impact Score: 6 | Exploitability Score: 2.8

VMScore: 605

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

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).

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linuxfoundation dex

CWE-347 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 https://nvd.nist.gov

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CVE-2020-26290

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