Multiple vulnerabilities in Kubernetes apiserver



| Updated: 2024-09-06
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2023-2727
CVE-2023-2728
CWE-ID CWE-264
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
 apiserver
Web applications / Other software

Vendor Kubernetes

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU77525

Risk: Medium

CVSSv4.0: 6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-2727

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

Exploit availability: No

Description

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

The vulnerability exists due to improperly imposed security restrictions. A remote user can launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers.

Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

apiserver: 1.18.0 - 1.27.2

CPE2.3 External links

https://groups.google.com/a/kubernetes.io/g/dev/c/sBNyUMzDXSk/m/D6wP8ZowAAAJ?pli=1


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU77526

Risk: Medium

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2023-2728

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 improperly imposed security restrictions. A remote user can launch containers that bypass the mountable secrets policy enforced by the ServiceAccount admission plugin when using ephemeral containers.

Kubernetes clusters are only affected if the ServiceAccount admission plugin and the kubernetes.io/enforce-mountable-secrets annotation are used together with ephemeral containers.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

apiserver: 1.18.0 - 1.27.2

CPE2.3 External links

https://groups.google.com/a/kubernetes.io/g/dev/c/_Xx3ZrNeZYg/m/cjBUC0IxAAAJ


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged 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.



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