Auth bypass in Linuxfoundation Zowe Api Mediation Layer
CVE-2021-4314
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.
Vulnerability class: Privilege Escalation
EPSS: 0.004 (36.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Linuxfoundation Zowe_api_mediation_layer
- Open Mainframe Project Zowe — versions 1.16.0
Weakness classification (CWE)
References
- zowe-security@lists.openmainframeproject.org (Product, product)
Frequently asked questions
- What is CVE-2021-4314?
- CVE-2021-4314 is a medium-severity vulnerability in Linuxfoundation Zowe Api Mediation Layer, classified under Improper Privilege Management. CVSS score: 5.3/10. Published 2023-01-18.
- How severe is CVE-2021-4314?
- Medium severity. CVSS v3 base score is 5.3 out of 10.