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CVE-2016-1247

Status Candidate

Overview

The nginx package before 1.6.2-5+deb8u3 on Debian jessie, the nginx packages before 1.4.6-1ubuntu3.6 on Ubuntu 14.04 LTS, before 1.10.0-0ubuntu0.16.04.3 on Ubuntu 16.04 LTS, and before 1.10.1-0ubuntu1.1 on Ubuntu 16.10, and the nginx ebuild before 1.10.2-r3 on Gentoo allow local users with access to the web server user account to gain root privileges via a symlink attack on the error log.

Related Files

Gentoo Linux Security Advisory 201701-22
Posted Jan 11, 2017
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201701-22 - Gentoo's NGINX ebuilds are vulnerable to privilege escalation due to the way log files are handled. Versions less than 1.10.2-r3 are affected.

tags | advisory
systems | linux, gentoo
advisories | CVE-2016-1247
MD5 | 6b8b2ccfcc7f829dbb83cd5eaee9e576
Nginx Root Privilege Escalation
Posted Nov 16, 2016
Authored by Dawid Golunski

Nginx web server packaging on Debian-based distributions such as Debian or Ubuntu was found to create log directories with insecure permissions which can be exploited by malicious local attackers to escalate their privileges from nginx/web user (www-data) to root. The vulnerability could be easily exploited by attackers who have managed to compromise a web application hosted on Nginx server and gained access to www-data account as it would allow them to escalate their privileges further to root access and fully compromise the system. This is fixed in 1.6.2-5+deb8u3 package on Debian and 1.10.0-0ubuntu0.16.04.3 on Ubuntu 16.04 LTS. UPDATE 2017/01/13 - nginx packages below version 1.10.2-r3 on Gentoo are also affected.

tags | exploit, web, local, root
systems | linux, debian, ubuntu
advisories | CVE-2016-1247
MD5 | a18720c4e6d5445fab2ac18439149c1f
Ubuntu Security Notice USN-3114-1
Posted Oct 26, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3114-1 - Dawid Golunski discovered that the nginx package incorrectly handled log file permissions. A remote attacker could possibly use this issue to obtain root privileges.

tags | advisory, remote, root
systems | linux, ubuntu
advisories | CVE-2016-1247
MD5 | ce9328090ece3848e39ae263d59a5b9d
Debian Security Advisory 3701-1
Posted Oct 26, 2016
Authored by Debian | Site debian.org

Debian Linux Security Advisory 3701-1 - Dawid Golunski reported the nginx web server packages in Debian suffered from a privilege escalation vulnerability (www-data to root) due to the way log files are handled. This security update changes ownership of the /var/log/nginx directory root. In addition, /var/log/nginx has to be made accessible to local users, and local users may be able to read the log files themselves local until the next logrotate invocation.

tags | advisory, web, local, root
systems | linux, debian
advisories | CVE-2016-1247
MD5 | 3a4c5042c91c64ed49d9200c46b457f8
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