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Date: Fri, 15 Jan 2016 16:58:07 +0100
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: oss-security <oss-security@...ts.openwall.com>,
Qualys Security Advisory <qsa@...lys.com>
Subject: Re: Qualys Security Advisory - Roaming through the
OpenSSH client: CVE-2016-0777 and CVE-2016-0778
On Fri, Jan 15, 2016 at 4:56 PM, Jason A. Donenfeld <Jason@...c4.com> wrote:
> Great work Qualys. One question about the PoC:
>
> On Thu, Jan 14, 2016 at 6:13 PM, Qualys Security Advisory
> <qsa@...lys.com> wrote:
>> # env ROAMING="heap_massaging:linux" "`pwd`"/sshd -o ListenAddress=127.0.0.1:222 -o
>> UsePrivilegeSeparation=no -f /etc/ssh/sshd_config -h /etc/ssh/ssh_host_rsa_key
>
> Does your proof of concept patch actually include support for this
> heap_massaging mode?
Read more carefully, answered my own question:
> - Massage the client's heap before roaming_reply() malloc()ates out_buf,
> and force malloc() to return a previously free()d but uncleansed chunk
> of sensitive information. The simple proof-of-concept in this advisory
> does not implement heap massaging.
That's a shame. Please reconsider.
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