GLSA 202105-38: nginx: Remote code execution

http://security.gentoo.org/

Severity:	high
Title:	nginx: Remote code execution
Date:	05/26/2021
Bugs:	#792087
ID:	202105-38

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

Package	Vulnerable	Unaffected	Architecture(s)
www-servers/nginx	< 1.21.0	>= 1.20.1	All supported architectures

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 --verbose
      ">=www-servers/nginx-1.21.0:mainline"

References

CVE-2021-23017

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202105-38.xml

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.