CVE-2020-26290

Summary

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).

Affected Software

Weaknesses

• CWE-347: CWE-347: Improper Verification of Cryptographic Signature

ADP Enrichment

CVE Program Container

Additional References

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

References

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

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