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Date: Tue, 14 Jul 2015 09:48:17 -0600
From: Kurt Seifried <>
Subject: Re: CVE Request: AWS s2n

On 07/14/2015 09:08 AM, Markus Vervier wrote:
> Hi,
> I would like to request a CVE for s2n.
> When a server is sending invalid DH values during a handshake a BIGNUM
> value is not properly initialized. This causes a null pointer
> dereference in a s2n based client leading to a crash or possible worse
> on old systems (e.g. on Debian kernels lower than 2.6.26).
> Technical details and a patch are available here:
> The fix was merged and is in commit
> 9af6ba1815dfd5c00361cc3bd45cee1d64e0c3bf.
> Markus

I just looked at the pull:

Markus Vervier noticed that our client side code isn't being
defensive enough around DHE parameters and can pass on a
"0" as the value of dh->p. Note: not that the the BIGNUM is NULL,
but that the value of the number is a literal zero.


Reminder: Client mode is disabled and won't be enabled until X509
validation is ready. But we can still make improvements and fixes
in the meantime.

so I'm not sure this needs a CVE as the code is not yet enabled.

Kurt Seifried -- Red Hat -- Product Security -- Cloud
PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
Red Hat Product Security contact:

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