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Date: Thu, 10 Oct 2013 21:38:19 +0800
From: Matt Johnston <matt@....asn.au>
To: Marcus Meissner <meissner@...e.de>
Cc: OSS Security List <oss-security@...ts.openwall.com>
Subject: Re: CVE Request: dropbear sshd daemon 2013.59 release
Hi all,
On Thu, Oct 10, 2013 at 03:27:07PM +0200, Marcus Meissner wrote:
> has this changes entry:
> - Limit the size of decompressed payloads, avoids memory exhaustion denial
> of service
> https://secure.ucc.asn.au/hg/dropbear/rev/0bf76f54de6f
That's the right patch.
> It also has this changes entry which might need one:
> - Avoid disclosing existence of valid users through inconsistent delays
> https://secure.ucc.asn.au/hg/dropbear/rev/a625f9e135a4
That should be https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a
for the user disclosure.
I don't think the constant-time memcmp (a625f9e135a4) is
worth noting with a CVE. The packet HMAC is non-repeatable
for an attacker. The password crypt comparison has too long
a delay between tries, I think the majority of programs
would use straight strcmp().
Cheers,
Matt
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