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Integrity Check for Disassociate/Associate/Re-associate

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Presentation on theme: "Integrity Check for Disassociate/Associate/Re-associate"— Presentation transcript:

1 Integrity Check for Disassociate/Associate/Re-associate
March 2002 Integrity Check for Disassociate/Associate/Re-associate Tim Moore Microsoft Tim Moore, Microsoft

2 Problem Disassociate, etc messages are not integrity checked
March 2002 Problem Disassociate, etc messages are not integrity checked Denial of service attacks Tim Moore, Microsoft

3 Solutions Integrity check the disassociate, etc. message
March 2002 Solutions Integrity check the disassociate, etc. message Disallow disassociate message when in 802.1X authenticated state Do not allow assoicate/reassoicate messages to affect DS Tim Moore, Microsoft

4 Integrity check Use data framing for disassociate, etc message
March 2002 Integrity check Use data framing for disassociate, etc message Not encrypted when no keys Needed because disassociate is used before authenticate Encrypted when keys available Tim Moore, Microsoft

5 802.1X With changes requested of 802.1X yesterday
March 2002 802.1X With changes requested of 802.1X yesterday EAP-Logoff is authenticated Require stations send an EAP-Logoff before disassociating Tim Moore, Microsoft

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