Microsoft Windows Vista Teredo Interface Firewall Bypass Vulnerability



Date Discovered

July 10, 2007


Windows Firewall for Windows Vista is prone to a vulnerability that may permit a bypass of existing firewall rules. An attacker may trigger this vulnerability by sending malicious network data through the Teredo network transport system to obtain sensitive information; other attacks are also possible. Note that Windows Vista systems configured with a 'Public' network profile are not vulnerable to this issue.

Technologies Affected

  • Avaya CIE 1.0.2
  • Microsoft Windows Vista
  • Microsoft Windows Vista Beta 1
  • Microsoft Windows Vista Business
  • Microsoft Windows Vista Enterprise
  • Microsoft Windows Vista Home Basic
  • Microsoft Windows Vista Home Premium
  • Microsoft Windows Vista Ultimate
  • Microsoft Windows Vista beta 2
  • Microsoft Windows Vista beta
  • Microsoft Windows Vista x64 Edition


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 successful exploits.

Implement multiple redundant layers of security.
Secondary firewall solutions may prevent exposure to this and other latent vulnerabilities.

The vendor has released advisory MS07-038 and fixes to address this issue; please see the references for details. Microsoft advisory MS07-038 has been revised; please see the referenced bulletin for specific details.



Jim Hoagland and Ollie Whitehouse of Symantec are credited with the discovery of this vulnerability.

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