It is possible to manipulate the JWT token without the knowledge of the JWT secret and authenticate without valid JWT token as any user. This is happening only in the situation when zOSMF doesn’t have the APAR PH12143 applied. This issue affects: 1.16 versions to 1.19. What happens is that the services using the ZAAS client or the API ML API to query will be deceived into believing the information in the JWT token is valid when it isn’t. It’s possible to use this to persuade the southbound service that different user is authenticated.
Published 2023-01-18 16:15:11
Updated 2023-01-26 18:33:59
Source Zowe
View at NVD,   CVE.org
Vulnerability category: BypassGain privilege

Exploit prediction scoring system (EPSS) score for CVE-2021-4314

0.06%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 25 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-4314

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.3
MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.9
1.4
NIST

CWE ids for CVE-2021-4314

  • The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
    Assigned by: zowe-security@lists.openmainframeproject.org (Secondary)
  • 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)

References for CVE-2021-4314

  • https://github.com/zowe/api-layer/
    GitHub - zowe/api-layer: The API Mediation Layer provides a single point of access for mainframe service REST APIs.
    Third Party Advisory

Products affected by CVE-2021-4314

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