GLSA 201701-22: NGINX: Privilege escalation

http://security.gentoo.org/

Severity:	normal
Title:	NGINX: Privilege escalation
Date:	01/11/2017
Bugs:	#605008
ID:	201701-22

Synopsis

Gentoo's NGINX ebuilds are vulnerable to privilege escalation due to the way log files are handled.

Background

nginx is a robust, small, and high performance HTTP and reverse proxy server.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
www-servers/nginx	< 1.10.2-r3	>= 1.10.2-r3	All supported architectures

Description

It was discovered that Gentoo’s default NGINX installation applied similar problematic permissions on “/var/log/nginx” as Debian (DSA-3701) and is therefore vulnerable to the same attack described in CVE-2016-1247.

Impact

A local attacker, who either is already NGINX’s system user or belongs to NGINX’s group, could potentially escalate privileges.

Workaround

Ensure that no untrusted user can create files in directories which are used by NGINX (or an NGINX vhost) to store log files.

Resolution

All NGINX users should upgrade to the latest ebuild revision:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=www-servers/nginx-1.10.2-r3"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201701-22.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.