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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
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.
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