CVE-2021-36775 Deleting PRTBs associated to a group doesn't cause deletion of corresponding RoleBindings

High 8.8 Published 1 Apr 2022 Updated 16 Sep 2024

Attackers retain revoked privileges because deleting Project Role Template Bindings fails to remove associated RoleBindings in SUSE Rancher.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2021-36775?

CVE-2021-36775 is a high-severity missing authorization vulnerability in SUSE Rancher, published on 1 Apr 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

a Improper Access Control vulnerability in SUSE Rancher allows users to keep privileges that should have been revoked. This issue affects: SUSE Rancher Rancher versions prior to 2.4.18; Rancher versions prior to 2.5.12; Rancher versions prior to 2.6.3.

Weakness: CWE-284

Which versions are affected by CVE-2021-36775?

7 open source packages ship an affected version, including github.com/rancher/rancher. It affects 1 product.

Package	Affected	Fixed in
`github.com/rancher/rancher` Go	All versions	None
`github.com/rancher/rancher` Go	All versions	`2.4.18`
`github.com/rancher/rancher` Go	All versions	`2.4.18`
`github.com/rancher/rancher` Go	From `2.5.0`	`2.5.12`
`github.com/rancher/rancher` Go	From `2.5.0`	`2.5.12`
`github.com/rancher/rancher` Go	From `2.6.0`	`2.6.3`

1 more packages

github.com/rancher/rancher Go From 2.6.0 2.6.3

Products include Rancher Rancher.

How do I fix CVE-2021-36775?

Upgrade github.com/rancher/rancher to a fixed version for your release line: 2.4.18, 2.5.12 or 2.6.3.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-36775 being exploited?

There is no known exploitation of CVE-2021-36775 in the wild and no public exploit code.

Sources

Also known as GHSA-28g7-896h-695v, GO-2024-2760.