Microsoft Windows IPsec Information Disclosure Vulnerability



Date Discovered

August 12, 2008


Microsoft Windows is prone to a vulnerability in the IPsec implementation. The vulnerability causes IPsec policies that are imported from a Windows Server 2003 domain to a Windows Server 2008 domain to be ignored. This will cause network traffic to be transmitted in clear text instead of being encrypted.

Technologies Affected

  • Microsoft Windows Server 2008 for 32-bit Systems
  • Microsoft Windows Server 2008 for Itanium-based Systems
  • Microsoft Windows Server 2008 for x64-based Systems
  • Microsoft Windows Vista
  • Microsoft Windows Vista Business
  • Microsoft Windows Vista Business SP1
  • Microsoft Windows Vista Enterprise
  • Microsoft Windows Vista Enterprise SP1
  • Microsoft Windows Vista Home Basic
  • Microsoft Windows Vista Home Basic SP1
  • Microsoft Windows Vista Home Premium
  • Microsoft Windows Vista Home Premium SP1
  • Microsoft Windows Vista SP1
  • Microsoft Windows Vista Ultimate
  • Microsoft Windows Vista Ultimate SP1
  • Microsoft Windows Vista x64 Edition
  • Microsoft Windows Vista x64 Edition SP1


Implementing Ethernet switches and binding MAC addresses to switch ports may prevent attacks.
Use network switches to segment the internal network. This may help minimize sniffing to the local network segment.

Communicate sensitive information over encrypted channels.
Use application- or protocol-specific encryption in addition to IPsec when transmitting sensitive information.

Microsoft has released a security bulletin to address this vulnerability.



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