[ASA-202111-7] kubectl-ingress-nginx: information disclosure

[Jonas Witschel]

Arch Linux Security Advisory ASA-202111-7
=========================================

Severity: High
Date    : 2021-11-18
CVE-ID  : CVE-2021-25742
Package : kubectl-ingress-nginx
Type    : information disclosure
Remote  : Yes
Link    : https://security.archlinux.org/AVG-2490

Summary
=======

The package kubectl-ingress-nginx before version 1.0.4-1 is vulnerable
to information disclosure.

Resolution
==========

Upgrade to 1.0.4-1.

# pacman -Syu "kubectl-ingress-nginx>=1.0.4-1"

The problem has been fixed upstream in version 1.0.4.

Workaround
==========

This issue cannot be fixed solely by upgrading kubectl-ingress-nginx.
To mitigate, set allow-snippet-annotations to false in your ingress-
nginx ConfigMap based on how you deploy ingress-nginx, see the
references for more information.

Description
===========

A security issue was discovered in ingress-nginx before versions 1.0.1
and 0.49.1 where a user that can create or update ingress objects can
use the custom snippets feature to obtain all secrets in the cluster.

This issue cannot be fixed solely by upgrading ingress-nginx. To
mitigate, set allow-snippet-annotations to false in your ingress-nginx
ConfigMap based on how you deploy ingress-nginx, see the references for
more information.

Impact
======

An authenticated remote attacker could disclose all secrets in the
cluster.

References
==========

https://github.com/kubernetes/ingress-nginx/issues/7837
https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/#allow-snippet-annotations
https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/
https://github.com/kubernetes/ingress-nginx/pull/7670
https://github.com/kubernetes/ingress-nginx/commit/4fc57dcc4969cd907c6eeadffbba2d14949db39e
https://security.archlinux.org/CVE-2021-25742
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