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Category:   Application (Web Server/CGI)  >   nginx Vendors:   nginx.org
nginx on Debian Log File Permissions Let Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1037104
SecurityTracker URL:  http://securitytracker.com/id/1037104
CVE Reference:   CVE-2016-1247   (Links to External Site)
Updated:  Nov 18 2016
Original Entry Date:  Oct 26 2016
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in nginx on Debian-based systems. A local user can obtain elevated privileges on the target system.

The nginx packages on Debian-based systems do not properly handle log file permissions in the '/var/log/nginx' directory. A local user with 'www-data' user privileges can obtain root privileges on the target system.

The original advisory is available at:

https://legalhackers.com/advisories/Nginx-Exploit-Deb-Root-PrivEsc-CVE-2016-1247.html

Dawid Golunski reported this vulnerability.

Impact:   A local user with 'www-data' privileges can obtain root privileges on the target system.
Solution:   Debian has issued a fix (1.6.2-5+deb8u3).

The Debian advisory is available at:

https://www.debian.org/security/2016/dsa-3701

Vendor URL:  nginx.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Debian), Linux (Ubuntu)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 26 2016 (Ubuntu Issues Fix) nginx on Debian Log File Permissions Let Local Users Gain Elevated Privileges
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 16.10.



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