CVE-2021-3827

Aliases:GHSA-4pc7-vqv5-5r3v
Advisory lineage Upstream: 0 Downstream: 2
Modified
Published: 23 Aug 2022, 15:52
Last modified:03 Aug 2024, 17:09

Vulnerability Summary

Overall Risk (default)
medium
27/100
CVSS Score
6.8 MEDIUM
v3.1 (nvd)
EPSS Score
0.21% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

23 Aug 2022, 15:52
Published
Vulnerability first disclosed
03 Aug 2024, 17:09
Last Modified
Vulnerability information updated

Description

A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior, an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. The highest threat from this vulnerability is to confidentiality and integrity.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.8CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
  • v3.1•HIGH•Score: 8.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Trends

Current EPSS score: 0.21%• Percentile: 43%

Techniques & Countermeasures

  • CWE-287•Improper Authentication

    When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Affected Systems

  • org.keycloak•keycloak-saml-core

    < 18.0.0

  • redhat•keycloak

    < 18.0.0

  • redhat•openshift_container_platform

    4.8 | 4.9

  • redhat•single_sign-on

    7.0 | 7.5.0

References (6)