full-disclosure - Re: [FD] Should openssl accept weak DSA/DH keys with g = +/- 1 ?

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Message-ID: <20140415212011.268d2194@hboeck.de>
Date: Tue, 15 Apr 2014 21:20:11 +0200
From: Hanno Böck <hanno@...eck.de>
To: fulldisclosure@...lists.org
Subject: Re: [FD] Should openssl accept weak DSA/DH keys with g = +/- 1 ?

On Tue, 15 Apr 2014 17:06:13 +0300
Georgi Guninski <guninski@...inski.com> wrote:

> openssl accepts DSA (and probably DH) keys with
> g=1 (or g= -1). Both are extremely weak, in
> practice plaintext.

openssl also accepts 15 as a prime for DH. I recently looked at this:
http://blog.hboeck.de/archives/841-Diffie-Hellman-and-TLS-with-nonsense-parameters.html

-- 
Hanno Böck
http://hboeck.de/

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