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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0586 -- Microsoft Security Bulletin MS03-030 REVISED Unchecked Buffer in DirectX Could Enable System Compromise (819696) 21 August 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: DirectX Publisher: Microsoft Operating System: Windows Impact: Execute Arbitrary Code/Commands Denial of Service Access Required: Remote CVE Names: CAN-2003-0346 Ref: ESB-2003.0509 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- - - ---------------------------------------------------------------------- Title: Unchecked Buffer in DirectX Could Enable System Compromise (819696) Released: 23 July 2003 Revised: 20 August 2003 (version 2.0) Software: Microsoft DirectX(r) 5.2 on Windows 98 Microsoft DirectX 6.1 on Windows 98 SE Microsoft DirectX 7.1 on Windows Millennium Edition Microsoft DirectX 7.0 on Windows 2000 Microsoft DirectX 8.0, 8.0a, 8.1, 8.1a, and 8.1b when installed on Windows 98, Windows 98 SE, Windows Millennium Edition or Windows 2000 Microsoft DirectX 8.1 on Windows XP or Windows Server 2003 Microsoft DirectX 9.0a when installed on Windows 98, Windows 98 SE, Windows Millennium Edition (Windows Me), Windows 2000, Windows XP, or 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 Bulletin at: http://www.microsoft.com/technet/security/bulletin/MS03-030.asp http://www.microsoft.com/security/security_bulletins/MS03-030.asp - - ---------------------------------------------------------------------- Reason for Revision: ==================== Subsequent to the original release of this bulletin, customers requested that we support additional versions of DirectX that were not covered by the original patches. This bulletin has been updated to provide information about this new patch. 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 could 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: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletins at http://www.microsoft.com/technet/security/bulletin/MS03-030.asp http://www.microsoft.com/security/security_bulletins/MS03-30.asp for information on obtaining this patch. Acknowledgment: =============== - - - eEye Digital Security, http://www.eeye.com - - --------------------------------------------------------------------- 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. - -----BEGIN PGP SIGNATURE----- Version: PGP 7.1 iQEVAwUBP0OhuI0ZSRQxA/UrAQH4Cgf/YwFILLEzgB44EjDdJRPU2HngXEi6NUkK QyTejhXUS2VvxrlWNwPD55JliEpdiG+Ee5pk+soK4Mu+KSqbcs3WhIWBZIvw3zv6 VfIDRnGExMEhI5ic5WgbT/e1r4+1Td4llTqDG9g27bNWbdOM/wvKb5VaVfSbXD6w +bS2OPz4trWv3YAcZtKStT459wi0H255YBszfeLVXvTTFp+YmFoIXqMbwznwBTnx CrLgRXnQ3Mgt2X/z8W9sB6r78FeYI0Idg3FtNY8cb+cYByUkUtPWNBps2NtKZO5e lZijRiL/RAtjE04eEHKa82m9GfSL4I+AKfR+XKc0knQcxqHomvZREw== =BVrU - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBP0Ql7Ch9+71yA2DNAQHxgQP/dDuA+cEhr3EOISbzgXqtYwNnPsxOJGEC kb3yu+DKjTcooPbDyo48fUs4G7iZTfi3g7YnFMaBoy82faGanx168L1qi0XGLDsc ne0jgQE/kAPNbm+ISM12xWrJruMbuPY/P2CxvEIiFjUMlaYqzUGW0UADMMN0r1Rs GlWVAIeIlWg= =iDo/ -----END PGP SIGNATURE-----