Date: Fri, 11 Apr 2014 12:36:57 -0500
From: HaCKsPy <hackspy@...il.com>
To: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: Re: [FD] heartbleed OpenSSL bug CVE-2014-0160

Cloudfare has also open a challenge about heartbleed. You can found at:

https://www.cloudflarechallenge.com/heartbleed

Regards,

Juan Pablo.


On Fri, Apr 11, 2014 at 10:21 AM, Ricardo Iramar dos Santos <
riramar@...il.com> wrote:

> I think that I found the answer for my question on the RFCs 6520 on page 5
> (
> https://tools.ietf.org/html/rfc6520#page-5) and 6066 page 8 (
> https://tools.ietf.org/html/rfc6066#page-8).
> Take a look on the RFC6520 on page 5:
>
>      The total length of a HeartbeatMessage MUST NOT exceed 2^14 or
> max_fragment_length when negotiated as defined in [RFC6066].
>
> Now let's take a look on RFC6066 page 8:
>
>      Without this extension, TLS specifies a fixed maximum plaintext
> fragment length of 2^14 bytes.  It may be desirable for constrained clients
> to negotiate a smaller maximum fragment length due to memory limitations or
> bandwidth limitations.
>
> I think the idea to have the client setting a SMALLER length is just for in
> case of memory or bandwidth limits.
> I had this in my mind because if there wasn't a reasonable explanation for
> the client set the length it could be that the developer malicious
> intention to include this bug. Anyway, I was thinking wrong since we have
> the reason on the RFCs.
>
> Thanks
> Ricardo Iramar
>
>
> On Fri, Apr 11, 2014 at 12:09 AM, Ricardo Iramar dos Santos <
> riramar@...il.com> wrote:
>
> > Reading this post
> >
> http://vrt-blog.snort.org/2014/04/heartbleed-memory-disclosure-upgrade.htmlit'ssaying "This is the length indicated by the SSL client for the
> > heartbeat payload".
> > Why the client should set the length of a payload? Why not have a fix or
> > some values? Sorry but I'm a not C developer and I didn't get the idea of
> > this.
> >
> > "Finally (and here's the critical part), using the size supplied by the
> > attacker rather than its actual length, it copies the request payload
> bytes
> > to the response buffer."
> >
> >
> > On Thu, Apr 10, 2014 at 9:17 PM, Michal Zalewski <lcamtuf@...edump.cx
> >wrote:
> >
> >> >
> >>
> http://m.smh.com.au/it-pro/security-it/man-who-introduced-serious-heartbleed-security-flaw-denies-he-inserted-it-deliberately-20140410-zqta1.html
> >>
> >> "Man who introduced serious 'Heartbleed' security flaw denies he
> >> inserted it deliberately"
> >>
> >> Wow, we're climbing to some new levels here.
> >>
> >> /mz
> >>
> >> _______________________________________________
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> >>
> >
> >
>
> _______________________________________________
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-- 
==========================



|_|0|_|   Ing. Juan Quiñe, CISSP, GISP, ISO 27001 LA, OSCP, Cobit
Foundations
|_|_|0|   visita: http://hackspy.blogspot.com
|0|0|0|   suscribete a: http://groups.google.com/group/swp-scene
a.k.a. HaCKsPy - Security Wari Projects now PeruSEC

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