CVE-2025-23208: IdP group membership revocation ignored in zot
Description
zot is a production-ready vendor-neutral OCI image registry. The group data stored for users in the boltdb database (meta.db) is an append-list so group revocations/removals are ignored in the API. SetUserGroups is alled on login, but instead of replacing the group memberships, they are appended. This may be due to some conflict with the group definitions in the config file, but that wasn't obvious to me if it were the case. Any Zot configuration that relies on group-based authorization will not respect group remove/revocation by an IdP. This issue has been addressed in version 2.1.2. All users are advised to upgrade. There are no known workarounds for this vulnerability.
Classification
CVE ID: CVE-2025-23208
CVSS Base Severity: HIGH
CVSS Base Score: 7.3
Affected Products
Vendor: project-zot
Product: zot
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 17.96% (scored less or equal to compared to others)
EPSS Date: 2025-02-15 (when was this score calculated)
References
https://github.com/project-zot/zot/security/advisories/GHSA-c9p4-xwr9-rfhxhttps://github.com/project-zot/zot/commit/002ac62d8a15bf0cba010b3ba7bde86f9837b613
https://github.com/project-zot/zot/blob/5e30fec65c49e3139907e2819ccb39b2e3bd784e/pkg/meta/boltdb/boltdb.go#L1665