CVE-2020-27846 : A signature verification vulnerability exists in crewjam/saml. This flaw allows

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.

Published 2020-12-21 16:15:13

Updated 2021-03-31 15:17:53

Source Red Hat, Inc.

View at NVD, CVE.org

Products affected by CVE-2020-27846

Redhat » Enterprise Linux » Version: 8.0
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
Matching versions
Redhat » Openshift Container Platform » Version: 3.11
cpe:2.3:a:redhat:openshift_container_platform:3.11:*:*:*:*:*:*:*
Matching versions
Redhat » Openshift Container Platform » Version: 4.0
cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
Matching versions
Redhat » Openshift Service Mesh » Version: 2.0
cpe:2.3:a:redhat:openshift_service_mesh:2.0:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 32
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Matching versions
Grafana » Grafana » Enterprise Edition
Versions from including (>=) 7.0.0 and before (<) 7.2.3
cpe:2.3:a:grafana:grafana:*:*:*:*:enterprise:*:*:*
Matching versions
Grafana » Grafana » Enterprise Edition
Versions before (<) 6.7.5
cpe:2.3:a:grafana:grafana:*:*:*:*:enterprise:*:*:*
Matching versions
Grafana » Grafana » Enterprise Edition
Versions from including (>=) 7.3.0 and before (<) 7.3.6
cpe:2.3:a:grafana:grafana:*:*:*:*:enterprise:*:*:*
Matching versions
Saml Project » Saml
Versions before (<) 0.4.3
cpe:2.3:a:saml_project:saml:*:*:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2020-27846

Top countries where our scanners detected CVE-2020-27846

Top open port discovered on systems with this issue 53

IPs affected by CVE-2020-27846 56,044

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2020-27846!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2020-27846

EPSS FAQ

1.25%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 84 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-27846

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
10.0	HIGH	AV:N/AC:L/Au:N/C:C/I:C/A:C	10.0	10.0	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2020-27846

CWE-115 Misinterpretation of Input

The product misinterprets an input, whether from an attacker or another product, in a security-relevant fashion.

Assigned by: secalert@redhat.com (Primary)

References for CVE-2020-27846

https://github.com/crewjam/saml/security/advisories/GHSA-4hq8-gmxx-h6w9

XML Processing · Advisory · crewjam/saml · GitHub
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210205-0002/

CVE-2020-27846 Grafana Vulnerability in NetApp Products | NetApp Product Security
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ICP3YRY2VUCNCF2VFUSK77ZMRIC77FEM/

[SECURITY] Fedora 33 Update: grafana-7.3.6-1.fc33 - package-announce - Fedora Mailing-Lists
Mailing List;Third 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/

Grafana 6.7.5, 7.2.3, and 7.3.6 released with important security fix for Grafana Enterprise | Grafana Labs
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1907670

1907670 – (CVE-2020-27846) CVE-2020-27846 crewjam/saml: authentication bypass in saml authentication
Issue Tracking;Patch;Third Party Advisory
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/

Coordinated disclosure of XML round-trip vulnerabilities in Go library
Exploit;Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3YUTKIRWT6TWU7DS6GF3EOANVQBFQZYI/

[SECURITY] Fedora 32 Update: grafana-7.3.6-1.fc32 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory