[NT] Vulnerability in DirectShow Allows Remote Code Execution (MS05-050)

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Vulnerability in DirectShow Allows Remote Code Execution (MS05-050)
------------------------------------------------------------------------

SUMMARY

A remote code execution vulnerability exists in DirectShow that could
allow an attacker who successfully exploited this vulnerability to take
complete control of the affected system.

DETAILS

Affected Software:
* Microsoft DirectX 7.0 on Microsoft Windows 2000 with Service Pack 4 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=2feffe6c-6c1c-42d9-b15e-f8f8d9c0e60e> Download the update
* Microsoft DirectX 8.1 on Microsoft Windows XP Service Pack 1 and on
Microsoft Windows XP with Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=2636cfce-49ea-4d06-80ba-21a84f3658a5> Download the update
* Microsoft DirectX 8.1 on Microsoft Windows XP Professional x64 Edition
-
<http://www.microsoft.com/downloads/details.aspx?FamilyId=ef614cdc-1db5-4b5c-8440-714941799a9f> Download the update
* Microsoft DirectX 8.1 on Microsoft Windows Server 2003 and on Microsoft
Windows Server 2003 with Service Pack 1 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=66f44766-3741-4c83-aa5f-1b3498131dd9> Download the update
* Microsoft DirectX 8.1 on Microsoft Windows Server 2003 for
Itanium-based Systems and on Microsoft Windows Server 2003 with SP1 for
Itanium-based Systems -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=7f8342a0-2462-46d3-9e40-262f72db68a6> Download the update
* Microsoft DirectX 8.1 on Microsoft Windows Server 2003 x64 Edition -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=76c3815c-a966-49eb-825f-1b8454c09bbf> Download the update
* Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and
Microsoft Windows Millennium Edition (ME) Review the FAQ section of this
bulletin for details about these operating systems.

Tested Microsoft Windows Components:
Affected Components:
* Microsoft DirectX 8.0, 8.0a, 8.1, 8.1a, 8.1b, and 8.2 when installed on
Windows 2000 Service Pack 4 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=FEDC7212-27B8-4993-9965-53E9298DB386> Download the update
* Microsoft DirectX 9.0, 9.0a, 9.0b, and 9.0c when installed on Windows
2000 Service Pack 4 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=1853AD1F-92C8-4C2B-8F52-9B2FC8DBF769> Download the update
* Microsoft DirectX 9.0, 9.0a, 9.0b, and 9.0c when installed on Windows
XP Service Pack 1 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=36FBED29-E264-4BC7-AB48-2CC4A59ACAA1> Download the update
* Microsoft DirectX 9.0, 9.0a, 9.0b, and 9.0c when installed on Windows
Server 2003 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=6083BA2D-4F1A-4900-8F7D-A32CB41CB5FA> Download the update

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2128>
CAN-2005-2128

Mitigating Factors for DirectShow Vulnerability:
* An attacker who successfully exploited this vulnerability could gain
the same user rights as the local user. Users whose accounts are
configured to have fewer user rights on the system could be less impacted
than users who operate with administrative user rights.

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who
successfully exploited this vulnerability could remotely take complete
control of an affected system. An attacker could then install programs;
view, change, or delete data; or create new accounts with full user
rights.

What causes the vulnerability?
An unchecked buffer in DirectShow.

What is DirectShow?
Microsoft DirectShow is used for streaming media on Microsoft Windows
operating systems. DirectShow is used for high-quality capture and
playback of multimedia streams. It automatically detects and uses video
and audio acceleration hardware when available, but also supports systems
without acceleration hardware. It is also integrated with other DirectX
technologies

Some of the types of applications that you can create by using DirectShow
include DVD players, video editing applications, AVI to ASF converters,
MP3 players, and digital video capture applications.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could take
complete control of the affected system.

Who could exploit the vulnerability?
On a Windows operating system, any anonymous user who could deliver a
specially crafted .avi file to the affected system could try to exploit
this vulnerability.

In a Web-based attack scenario, an attacker would have to host a Web site
that contains a Web page that is used to try to exploit this
vulnerability. An attacker would have no way to force users to visit a
malicious Web site. Instead, an attacker would have to persuade them to
visit the Web site, typically by getting them to click a link that takes
them to the attacker's site. It could also be possible to display
malicious Web content by using banner advertisements or by using other
methods to deliver Web content to affected systems.

What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be
at more risk if users who do not have sufficient administrative
permissions are given the ability to log on to servers and to run
programs. However, best practices strongly discourage allowing this.

What does the update do?
The update removes the vulnerability by modifying the way that DirectShow
validates the length of a message before it passes the message to the
allocated buffer.

When this security bulletin was issued, had this vulnerability been
publicly disclosed?
No. Microsoft received information about this vulnerability through
responsible disclosure. Microsoft had not received any information to
indicate that this vulnerability had been publicly disclosed when this
security bulletin was originally issued.

When this security bulletin was issued, had Microsoft received any reports
that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this
vulnerability had been publicly used to attack customers and had not seen
any examples of proof of concept code published when this security
bulletin was originally issued.

ADDITIONAL INFORMATION

The information has been provided by Microsoft Product Security.
The original article can be found at:
<http://www.microsoft.com/technet/security/Bulletin/MS05-050.mspx>
http://www.microsoft.com/technet/security/Bulletin/MS05-050.mspx

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