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Title: Unchecked Buffer in Windows Redirector Could Allow
Privilege Elevation (810577)
Date: 05 February 2003
Software: Microsoft Windows XP
Impact: Privilege elevation
Max Risk: Important
Bulletin: MS03-005

Microsoft encourages customers to review the Security Bulletins at:
http://www.microsoft.com/technet/security/bulletin/ms03-005.asp
http://www.microsoft.com/security/security_bulletins/ms03-005.asp

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Issue:

The Windows Redirector is used by a Windows client to access files,
whether local or remote, regardless of the underlying network
protocols in use. For example, the "Add a Network Place" Wizard or
the NET USE command can be used to map a network share as a local
drive, and the Windows Redirector will handle the routing of
information to and from the network share.

A security vulnerability exists in the implementation of the
Windows Redirector on Windows XP because an unchecked buffer is
used to receive parameter information. By providing malformed data
to the Windows Redirector, an attacker could cause the system to
fail, or if the data was crafted in a particular way, could run
code of the attacker's choice.

Mitigating Factors:

• An attacker would require the ability to log onto the system
  interactively in order to run programs that use the Windows
  Redirector. This vulnerability cannot be exploited remotely.
• Windows XP systems that are not shared between users would not
  be at risk.

Risk Rating:

• Windows XP: Important

Patch Availability:

• A patch is available to fix this vulnerability. Please read the
  Security Bulletins at

  http://www.microsoft.com/technet/security/bulletin/ms03-005.asp
  http://www.microsoft.com/security/security_bulletins/ms03-005.asp

  for information on obtaining this patch.

Acknowledgment:

• NSFocus (http://www.nsfocus.com)

Home User Security Notification Service

Microsoft is now offering the Microsoft Security Update, a security
bulletin notification service for home users. To learn more about
this service, please go to:

http://www.microsoft.com/security/security_bulletins/decision.asp

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