SYMPTOMS
Microsoft has made a patch available for the Windows Media
Player 6.4 and 7 "Buffer Overrun Vulnerability." This vulnerability is a
variant of the buffer overrun vulnerability that is described in the following
Microsoft Security Bulletin:
Windows Media Player supports the use of .asx files so you can
play streaming media that resides on intranet or Internet sites. However, the
code that parses .asx files has an unchecked buffer, and this could potentially
enable a malicious user to run code on another user's computer. The attacker
could either send an affected file to another user and entice the user to run
or preview it, or the attacker could host such a file on a Web site and cause
it to start automatically whenever a user visited the site. The code could take
any action on the computer that the legitimate user could take.
Mitigating Factors
- The attacker would need the ability to entice the user into
either visiting a Web site that is under the attacker's control, or open an
HTML e-mail message the attacker had prepared.
- The attacker would need to know the specific operating
system that the user was running to tailor the attack code properly. If the
attacker made an incorrect guess about the user's operating system, the attack
would cause the user's program to stop responding (hang), but not run code of
the attacker's choice.
RESOLUTION
Windows Media Player 7
To resolve this problem, view the following Microsoft Web site to
upgrade to Windows Media Player 7.1 or later:
For more information about Windows Media Technologies, please see
the following Microsoft Web site:
Windows Media Player 6.4
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that you determine are at risk of attack. Evaluate the computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to the computer. See the associated
Microsoft Security Bulletin to help determine the degree of risk. This hotfix may receive additional testing. If the computer is sufficiently at risk, we recommend that you apply this hotfix now.
To resolve this problem immediately, download the hotfix by following the instructions later in this article or contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The following file is available for
download from the Microsoft Download Center:
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
The English version of this fix
should have the following file attributes or later:
Date Time Version Size File name
-----------------------------------------------------
01/31/2001 11:33p 516 Control.xml
05/03/2001 04:24p 6.4.7.1117 498,448 Dxm550.dll
05/03/2001 05:02p 6.4.7.1117 525,312 Dxmasf.dll
05/11/2001 09:28a 5,891 Eula.txt
04/20/2001 04:33p 4.1.0.3925 28,160 Laprxy.dll
04/20/2001 04:33p 4.1.0.3925 68,608 Logagent.exe
04/05/2001 04:09p 6.4.9.1116 844,048 Msdxm.ocx
04/05/2001 04:10p 6.4.7.1116 845,584 Msdxm550.ocx
05/01/2001 05:08p 7.1.0.3055 274,432 Setup_wm.exe
04/20/2001 01:14p 4.1.0.3925 251,904 Strmdll.dll
12/06/2000 12:43a 7.0.0.1958 65,592 Wminf.exe
05/08/2001 03:10p 8,636 Wmqfe.cat
04/25/2001 04:10p 2,439 Wmqfe.inf
