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Gentoo GLSA-202105-38 High Severity: Nginx Remote Code Execution

gentoo
Calendar Grey May 26, 2021
Dist Gentoo Esm H88
An urgent alert concerning Apache from Fedora has pinpointed a severe security flaw that allows for unapproved remote command execution.
A vulnerability in nginx could lead to remote code execution.

Summary

It was discovered that nginx did not properly handle DNS responses when "resolver" directive is used.

Topics%20covered

Topics Covered

security advisory high severity gentoo remote code execution remote execution nginx

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
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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.

Severity: High
Title: nginx: Remote code execution
Date: May 26, 2021
Bugs: #792087
ID: 202105-38

Topics%20covered

Topics Covered

security advisory high severity gentoo remote code execution remote execution nginx

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.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 www-servers/nginx < 1.21.0 >= 1.20.1:0 >= 1.21.0:mainline

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.

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