Microsoft Windows Media Components ISATAP URL Handling Information Disclosure Vulnerability



Date Discovered

December 9, 2008


Microsoft Windows Media Components is prone to an information-disclosure vulnerability when handling 'ISATAP' (Intra-Site Automatic Tunnel Addressing Protocol) URLs. An attacker can use this vulnerability to obtain information that may aid in further attacks.

Technologies Affected

  • HP Storage Management Appliance 2.1
  • Microsoft Windows Embedded Standard 2009
  • Microsoft Windows Media Format 11
  • Microsoft Windows Media Format 7.1
  • Microsoft Windows Media Format 9.0
  • Microsoft Windows Media Format 9.5
  • Microsoft Windows Media Format 9.5 x64
  • Microsoft Windows Media Player 6.4
  • Microsoft Windows Media Services 2008
  • Microsoft Windows Media Services 4.0
  • Microsoft Windows Media Services 9.0 Series
  • Microsoft Windows XP Embedded SP2
  • Microsoft Windows XP Embedded SP2 Feature Pack 2007
  • Microsoft Windows XP Embedded SP3
  • Microsoft Windows XP Embedded Update Rollup 1.0


Block external access at the network boundary, unless external parties require service.
If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Run all software as a nonprivileged user with minimal access rights.
When possible, run all software as a user with minimal privileges and limited access to system resources. Use additional precautions such as restrictive environments to insulate software that may potentially handle malicious content.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate exploit attempts or activity that results from successful exploits.

Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Microsoft has released an advisory along with fixes to address this issue. Please see the references for more information. NOTE: Microsoft has released new updates for Windows XP Embedded. Users of that operating system need to reinstall updates.




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