Home/CVE/A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authenticatio
CVE

CVE-2020-27846

A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authenticatio

A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CRITICAL · CVSS 9.8 EPSS 0.07544
Act now
  • EPSS percentile: top 8% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules3 YARA rules0
⬡

Weakness Classification

CWE-115Misinterpretation of Input
▤

Affected Products & Versions

8
grafana< 6.7.5
grafana>= 7.0.0 and < 7.2.3
grafana>= 7.3.0 and < 7.3.6
saml project saml< 0.4.3
redhat openshift container platformall versions
redhat openshift service meshall versions
redhat enterprise linuxall versions
fedoraproject fedoraall versions
▤

Affected Packages

1
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/crewjam/saml CRITICAL fixed in 0.4.3
⚠

Public Exploits & PoCs

1
pocmattermost.com · coordinated-disclosure-go-xml-vulnerabilitiesmattermost.com
◈

Sigma Hunt Rules

3
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSAML Token Issuer Anomaly
productmediumAWS SAML Provider Deletion Activity
productmediumAWS Suspicious SAML Activity
▣

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 NVD21 Dec 2020 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

2
rhsaRHSA-2020:5633Moderate
rhsaRHSA-2021:1859Critical
🔗

References & Sources

6
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=1907670Issue TrackingPatchThird Party Advisory
https://github.com/crewjam/saml/security/advisories/GHSA-4hq8-gmxx-h6w9Third Party Advisory
https://grafana.com/blog/2020/12/17/grafana-6.7.5-7.2.3-and-7.3.6-released-with-important-security-fix-for-grafana-enterprise/Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YUTKIRWT6TWU7DS6GF3EOANVQBFQZYI/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ICP3YRY2VUCNCF2VFUSK77ZMRIC77FEM/
https://security.netapp.com/advisory/ntap-20210205-0002/Third Party Advisory
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