Home/CVE/A vulnerability exists in the SAML connector of the github.com/dexidp/dex library used to process SAML Signature Validat
CVE

CVE-2020-27847

A vulnerability exists in the SAML connector of the github.com/dexidp/dex library used to process SAML Signature Validat

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.

CRITICAL · CVSS 9.8 EPSS 0.00357
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-228Improper Handling of Syntactically Invalid Structure
▤

Affected Products & Versions

1
linuxfoundation dex< 2.27.0
▤

Affected Packages

2
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go github.com/dexidp/dex CRITICAL fixed in 2.27.0
Go github.com/russellhaering/goxmldsig CRITICAL fixed in 1.1.0
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 May 2021 · 11:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=1907732Issue TrackingThird Party Advisory
https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5PatchThird Party Advisory
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/Vendor Advisory
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