full-disclosure - [FD] IKE Aggressive Mode Downgrade Attack?

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Message-ID: <7C12296C82615049B55D06DEC22475B56784579992@hex01>
Date: Thu, 30 Apr 2015 14:34:53 +0200
From: Melchior Limacher <mli@...tect7.com>
To: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: [FD] IKE Aggressive Mode Downgrade Attack?

Hello

I was reading about "ike aggressive mode with pre shared key" (CVE-2002-1623).

As described by cisco (http://www.cisco.com/en/US/tech/tk583/tk372/technologies_security_notice09186a008016b57f.html), this is still an issue
"When responding to IPSec session initialization, Cisco IOS(r) software
may use Aggressive Mode even if it has not been explicitly configured
to do so. Cisco IOS software initially tries to negotiate using Main
Mode but, failing that, resorts to Aggressive Mode."

Are there known downgrade attacks? Counter-Measures?

Thanks for your feedback and regards,
mli

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