Подскажите как повысить привилегии. Каким эксплойтом?

есть два сервера

1:

$ uname -a

Linux ks209234.kimsufi.com 2.6.38.2-xxxx-std-ipv6-64 #2 SMP Thu Aug 25 16:43:23 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/*-release

CentOS release 6.2 (Final)

CentOS release 6.2 (Final)

CentOS release 6.2 (Final)

2:

$ uname -a

Linux php54-web-21 4.4.0-53-generic #74-Ubuntu SMP Fri Dec 2 15:59:10 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/*-release

DISTRIB_ID=Ubuntu

DISTRIB_RELEASE=16.04

DISTRIB_CODENAME=xenial

DISTRIB_DESCRIPTION="Ubuntu 16.04.2 LTS"

NAME="Ubuntu"

VERSION="16.04.2 LTS (Xenial Xerus)"

ID=ubuntu

ID_LIKE=debian

PRETTY_NAME="Ubuntu 16.04.2 LTS"

VERSION_ID="16.04"

HOME_URL="http://www.ubuntu.com/"

SUPPORT_URL="http://help.ubuntu.com/"

BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"

VERSION_CODENAME=xenial

UBUNTU_CODENAME=xenial

Спасибо