It was found in OpenShift, before version 4.8, that the generated certificate for the in-cluster Service CA, incorrectly included additional certificates. The Service CA is automatically mounted into all pods, allowing them to safely connect to trusted in-cluster services that present certificates signed by the trusted Service CA. The incorrect inclusion of additional CAs in this certificate would allow an attacker that compromises any of the additional CAs to masquerade as a trusted in-cluster service.
Published 2021-07-30 20:15:08
Updated 2022-10-27 12:28:53
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: BypassGain privilege

Exploit prediction scoring system (EPSS) score for CVE-2021-3636

0.04%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 11 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-3636

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.1
MEDIUM AV:A/AC:L/Au:S/C:P/I:P/A:N
5.1
4.9
NIST
4.6
MEDIUM CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
2.1
2.5
NIST

CWE ids for CVE-2021-3636

  • When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
    Assigned by:
    • nvd@nist.gov (Primary)
    • secalert@redhat.com (Secondary)
  • The product does not validate, or incorrectly validates, a certificate.
    Assigned by: secalert@redhat.com (Secondary)

References for CVE-2021-3636

Products affected by CVE-2021-3636

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