Gentoo: GLSA-201701-22: NGINX: Privilege escalation
Summary
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.
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
[ 1 ] CVE-2016-1247 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-1247 [ 2 ] DSA-3701 https://www.debian.org/security/2016/dsa-3701 [ 3 ] Technical analysis https://legalhackers.com/advisories/Nginx-Exploit-Deb-Root-PrivEsc-CVE-2016-1247.html
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201701-22
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.
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 ------------------------------------------------------------------- 1 www-servers/nginx < 1.10.2-r3 >= 1.10.2-r3
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.
