Gentoo Linux Security Advisory 202105-38 - A vulnerability in nginx could lead to remote code execution. Versions less than 1.21.0 are affected.
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Gentoo Linux Security Advisory GLSA 202105-38
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https://security.gentoo.org/
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Severity: High
Title: nginx: Remote code execution
Date: May 26, 2021
Bugs: #792087
ID: 202105-38
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Synopsis
========
A vulnerability in nginx could lead to remote code execution.
Background
==========
nginx is a robust, small, and high performance HTTP and reverse proxy
server.
Affected packages
=================
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Package / Vulnerable / Unaffected
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1 www-servers/nginx < 1.21.0 >= 1.20.1:0
>= 1.21.0:mainline
Description
===========
It was discovered that nginx did not properly handle DNS responses when
"resolver" directive is used.
Impact
======
A remote attacker, able to provide DNS responses to a nginx instance,
could cause the execution of arbitrary code with the privileges of the
process or a Denial of Service condition.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All nginx users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/nginx-1.20.1"
All nginx mainline users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot -v ">=www-servers/nginx-1.21.0:mainline"
References
==========
[ 1 ] CVE-2021-23017
https://nvd.nist.gov/vuln/detail/CVE-2021-23017
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/202105-38
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.
License
=======
Copyright 2021 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
https://creativecommons.org/licenses/by-sa/2.5