Vulnerability CVE-2020-26290
Published: 2020-12-28

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).

Type:

CWE-347

 (Improper Verification of Cryptographic Signature)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.8/10
6.4/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Linuxfoundation -> DEX 

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