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Re: [ GLSA 200512-04 ] Openswan, IPsec-Tools: Vulnerabilities in ISAK MP Protocol implementation
From: Paul Wouters <paul () xelerance com>
Date: Tue, 13 Dec 2005 21:49:40 +0100 (CET)

On Mon, 12 Dec 2005, Thierry Carrez wrote:

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Gentoo Linux Security Advisory                           GLSA 200512-04
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                                           http://security.gentoo.org/
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 Severity: Normal
    Title: Openswan, IPsec-Tools: Vulnerabilities in ISAKMP Protocol
           implementation
     Date: December 12, 2005
     Bugs: #112568, #113201
       ID: 200512-04

Openswan and IPsec-Tools suffer from an implementation flaw which may
allow a Denial of Service attack.

That is correct (for openswan)

Impact
======

A remote attacker can create a specially crafted packet using 3DES with
an invalid key length, resulting in a Denial of Service attack, format
string vulnerabilities or buffer overflows.

That's a copy and paste from the IPsec proto testsuite.

1) It conflicts with the above comment that this is only a DOS
2) It's incorrect (for openswan)

Workaround
==========

Avoid using "aggressive mode" in ISAKMP Phase 1, which exchanges
information between the sides before there is a secure channel.

In fact, you would to both have aggressive mode enabled AND know the PSK.
If you have those two enabled, you are vulnerable to a MITM anyway, since
any client knowing the PSK can pretend to be the IPsec security gateway.

Paul


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