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HistoryJul 24, 2003 - 12:00 a.m.

Microsoft Security Bulletin MS03-030: Unchecked Buffer in DirectX Could Enable System Compromise (Q819696)

2003-07-2400:00:00
vulners.com
16

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Title: Unchecked Buffer in DirectX Could Enable System
Compromise (819696)
Date: July 23, 2003
Software: Microsoft DirectX(r) 5.2 on Windows 98
Microsoft DirectX 6.1 on Windows 98 SE
Microsoft DirectX 7.0a on Windows Millennium Edition
Microsoft DirectX 7.0 on Windows 2000
Microsoft DirectX 8.1 on Windows XP
Microsoft DirectX 8.1 on Windows Server 2003
Microsoft DirectX 9.0a when installed on Windows 98
Microsoft DirectX 9.0a when installed on Windows 98 SE
Microsoft DirectX 9.0a when installed on Windows
Millennium Edition
Microsoft DirectX 9.0a when installed on Windows 2000
Microsoft DirectX 9.0a when installed on Windows XP
Microsoft DirectX(r) 9.0a when installed on Windows
Server 2003
Microsoft Windows NT 4.0 Server with either Windows
Media Player 6.4 or Internet Explorer 6 Service Pack 1
installed.
Microsoft Windows NT 4.0, Terminal Server Edition with
either Windows Media Player 6.4 or Internet Explorer 6
Service Pack 1 installed.

Impact: Allow an attacker to execute code on a user's system
Max Risk: Critical
Bulletin: MS03-030

Microsoft encourages customers to review the Security Bulletins at:
http://www.microsoft.com/technet/security/bulletin/MS03-030.asp
http://www.microsoft.com/security/security_bulletins/ms03-030.asp


Issue:

DirectX consists of a set of low-level Application Programming
Interfaces (APIs) that are used by Windows programs for multimedia
support. Within DirectX, the DirectShow technology performs client-
side audio and video sourcing, manipulation, and rendering.

There are two buffer overruns with identical effects in the
function used by DirectShow to check parameters in a Musical
Instrument Digital Interface (MIDI) file. A security vulnerability
results because it would be possible for a malicious user to
attempt to exploit these flaws and execute code in the security
context of the logged-on user.

An attacker could seek to exploit this vulnerability by creating a
specially crafted MIDI file designed to exploit this vulnerability
and then host it on a Web site or on a network share, or send it by
using an HTML-based e-mail. In the case where the file was hosted
on a Web site or network share, the user would need to open the
specially crafted file. If the file was embedded in a page the
vulnerability could be exploited when a user visited the Web page.
In the HTML-based e-mail case, the vulnerability could be exploited
when a user opened or previewed the HTML-based e-mail. A successful
attack could cause DirectShow, or an application making use of
DirectShow, to fail. A successful attack could also cause an
attacker's code to run on the user's computer in the security
context of the user.

Mitigating Factors:

    • By default, Internet Explorer on Windows Server 2003 runs in
      Enhanced Security Configuration. This default configuration of
      Internet Explorer blocks the e-mail-based vector of this attack
      because Microsoft Outlook Express running on Windows Server 2003 by
      default reads e-mail in plain text. If Internet Explorer Enhanced
      Security Configuration were disabled, the protections put in place
      that prevent this vulnerability from being exploited would be
      removed.
    • In the Web-based attack scenario, the attacker would have to host
      a Web site that contained a Web page used to exploit these
      vulnerabilities. An attacker would have no way to force users to
      visit a malicious Web site outside the HTML-based e-mail vector.
      Instead, the attacker would need to lure them there, typically by
      getting them to click a link that would take them to the attacker's
      site.
  • -The combination of the above means that on Windows Server 2003 an
    administrator browsing only to trusted sites should be safe from
    this vulnerability.
    • Code executed on the system would only run under the privileges
      of the logged-on user.

Risk Rating:

  • Critical

Patch Availability:

Acknowledgment:


THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE
FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

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