Vulnerability CVE-2020-27847
Published: 2021-05-28

Description:
A vulnerability exists in the SAML connector of the github.com/dexidp/dex library used to process SAML Signature Validation. This flaw allows an attacker to bypass SAML authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. This flaw affects dex versions before 2.27.0.

Type:

CWE-228

 (Improper Handling of Syntactically Invalid Structure)

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

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Linuxfoundation -> DEX 

 References:
https://bugzilla.redhat.com/show_bug.cgi?id=1907732
https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/
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