SUSE update for Includes a kubernetes update to 1.17.17 including a backport for CVE-2021-25741

1) Security restrictions bypass

EUVDB-ID: #VU56902

Risk: Medium

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-25741

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to application does not properly impose security restrictions by allowing hostPath-like access without use of the hostPath feature. A remote user can create a container with subpath volume mounts to access files and directories outside of the volume, including on the host filesystem.

Mitigation

Update the affected package Includes a kubernetes update to 1.17.17 including a backport for CVE-2021-25741 to the latest version.

Vulnerable software versions

SUSE CaaS Platform: 4.0

skuba: before 1.4.13-3.56.2

kubernetes-kubelet: before 1.17.17-4.25.2

kubernetes-kubeadm: before 1.17.17-4.25.2

kubernetes-common: before 1.17.17-4.25.2

kubernetes-client: before 1.17.17-4.25.2

caasp-release: before 4.2.6-24.43.2

skuba-update: before 1.4.13-3.56.2

release-notes-caasp: before 4.2.20210929-4.71.2

External links

http://www.suse.com/support/update/announcement/2021/suse-su-20213323-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.