Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 27 Nov 2013 10:09:49 +1100
From: Michael Samuel <>
Subject: Re: CVE Request: static IV used in Percona XtraBackup

On 27 November 2013 05:17, Florian Weimer <> wrote:
> Is suppose this is part of the fix.
> +void
> +xb_crypt_init_iv()
> +{
> +       uint seed = time(NULL);
> +       srandom(seed);
> +}

That's at-best a 32-bit nonce, but would only repeat of srandom() had
collisions.  Presumably more than 1 backup a second is rare?

Just reading data from /dev/urandom would be more robust.

On a side note, a constant IV isn't fatal so long as a unique key is
used every time.  Is the key random, password derived or constant?


Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.