Re: [Full-disclosure] OpenBSD has Open Backdoored Software Distribution - admitted by Theo

[The Sp3ctacle <sp3ctacle@xxxxxxxxx>]

It shouldn't be that hard to bindiff the code compiled with with the
shipped compiler with the code from a compiler that predates the
latest backdoor shenanigans.  You could decompile the binary code and
then ask a cryptographer to audit.

On Wed, Dec 22, 2010 at 7:36 PM, mrx <mrx@xxxxxxxxxxxxxxxxxxx> wrote:
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> On 23/12/2010 00:00, Dan Kaminsky wrote:
>> On Wed, Dec 22, 2010 at 3:47 PM, Dave Nett <dave.nett@xxxxxxxxx> wrote:
>>
>>> http://marc.info/?l=openbsd-tech&m=129296046123471&w=2
>>>
>>> Long mail which just admit has backdoor, poor Theo.
>>>
>>
>>
>>     (g) I believe that NETSEC was probably contracted to write backdoors
>>         as alleged.
>>     (h) If those were written, I don't believe they made it into our
>>         tree.  They might have been deployed as their own product.
>>
>> You had only one more sentence to read!  Just one!
>>
>
>
>
> "> where would you start auditing the code? It's just too much.
>
> Actually, it is a very small part of the tree..."
>
>
> I am aware that compilers can be coded to introduce "features" into binaries 
> that are not in the actual source code itself.
> So with all due respect and possibly much ignorance on my part, what is a 
> code audit going to achieve if one uses the shipped compiler to
> compile the source? Unless one codes ones own compiler can any binary be 
> trusted?
>
> Would not reversing the compiled code lead to a proper insight? Are the 
> compiled binaries that handle these crypto functions so complex that
> they cannot be reversed by a skilled assembly coder? I guess that such a 
> coder would have to be an expert cryptographer too, or at least
> collaborate with one.
>
> My curiosity is genuine, I am trying to educate myself about such things.
>
> regards
> Dave
>
>
> - --
> Mankind's systems are white sticks tapping walls.
> Thanks Roy
> http://www.propergander.org.uk
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/