Date: Fri, 14 Mar 2014 12:06:15 +0000
From: "Nicholas Lemonias." <lem.nikolas@...glemail.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Google vulnerabilities with PoC

Live Proof Of Concept
==================
http://upload.youtube.com/?authuser=0&upload_id=
AEnB2UqVZlaog3GremriQEGDoUK3cdGGPu9MVIfyObgYajjo6i1--
uQicn6jhbwsdNrqSF4ApbUbhCcwzdwe4xf_XTbL_t5-aw&origin=
CiNodHRwOi8vd3d3LnlvdXR1YmUuY29tL3VwbG9hZC9ydXBpbxINdmlkZW8tdXBsb2Fkcw


{"sessionStatus":{"state":"FINALIZED","externalFieldTransfers":[{"name":"file","status":"COMPLETED","bytesTransferred":113,"bytesTotal":113,"formPostInfo":{"url":"
http://www.youtube.com/upload/rupio?authuser=0\u0026upload_id=
AEnB2UqVZlaog3GremriQEGDoUK3cdGGPu9MVIfyObgYajjo6i1--
uQicn6jhbwsdNrqSF4ApbUbhCcwzdwe4xf_XTbL_t5-aw\u0026file_id=000
","cross_domain_url":"http://upload.youtube.com/?authuser=0\u0026upload_id=
AEnB2UqVZlaog3GremriQEGDoUK3cdGGPu9MVIfyObgYajjo6i1--
uQicn6jhbwsdNrqSF4ApbUbhCcwzdwe4xf_XTbL_t5-aw\u0026origin=
CiNodHRwOi8vd3d3LnlvdXR1YmUuY29tL3VwbG9hZC9ydXBpbxINdmlkZW8tdXBsb2Fkcw"},"content_type":"text/x-sh"}],"additionalInfo":{"uploader_service.GoogleRupioAdditionalInfo":{"completionInfo":{"status":"SUCCESS","customerSpecificInfo":{"status":
"ok", "video_id":
"KzKDtijwHFI"}}}},"upload_id":"AEnB2UqVZlaog3GremriQEGDoUK3cdGGPu9MVIfyObgYajjo6i1--uQicn6jhbwsdNrqSF4ApbUbhCcwzdwe4xf_XTbL_t5-aw"}}

The above proof of concept demonstrates :

1. We have bypassed the security controls in Youtube and uploaded an
unexpected file type.
2. The file is persistent and has not been deleted by YouTube.
3. It can be queried for information since it is assigned a unique
upload_id.
4. It's successfully uploaded to youtube.com  As you can see it give out
the total bytes written to the remote network.
5. "content_type":"text/x-sh"}]   -------> The file is a shell
script script named 'file'
6. It can be enumerated by a non-authenticated user, remotely.


So that is a proof that the data are persistent.



> On Fri, Mar 14, 2014 at 10:45 AM, Nicholas Lemonias. <
> lem.nikolas@...glemail.com> wrote:
>
>> We are on a different level perhaps. We do certainly disagree on those
>> points.
>> I wouldn't hire you as a consultant, if you can't tell if that is a valid
>> vulnerability..
>>
>>
>> Best Regards,
>> Nicholas Lemonias.
>>
>> On Fri, Mar 14, 2014 at 10:10 AM, Mario Vilas <mvilas@...il.com> wrote:
>>
>>> But do you have all the required EH certifications? Try this one from
>>> the Institute for
>>> Certified Application Security Specialists: http://www.asscert.com/
>>>
>>>
>>> On Fri, Mar 14, 2014 at 7:41 AM, Nicholas Lemonias. <
>>> lem.nikolas@...glemail.com> wrote:
>>>
>>>> Thanks Michal,
>>>>
>>>> We are just trying to improve Google's security and contribute to the
>>>> research community after all. If you are still on EFNet give me a shout
>>>> some time.
>>>>
>>>>  We have done so and consulted to hundreds of clients including
>>>> Microsoft, Nokia, Adobe and some of the world's biggest corporations. We
>>>> are also strict supporters of the ACM code of conduct.
>>>>
>>>> Regards,
>>>> Nicholas Lemonias.
>>>> AISec
>>>>
>>>>
>>>> On Fri, Mar 14, 2014 at 6:29 AM, Nicholas Lemonias. <
>>>> lem.nikolas@...glemail.com> wrote:
>>>>
>>>>> Hi Jerome,
>>>>>
>>>>> Thank you for agreeing on access control, and separation of duties.
>>>>>
>>>>> However successful exploitation permits arbitrary write() of any file
>>>>> of choice.
>>>>>
>>>>> I could release an exploit code in C Sharp or Python that permits
>>>>> multiple file uploads of any file/types, if the Google security team feels
>>>>> that this would be necessary. This is unpaid work, so we are not so keen on
>>>>> that job.
>>>>>
>>>>>
>>>>>
>>>>> On Fri, Mar 14, 2014 at 6:04 AM, Jerome Athias <athiasjerome@...il.com
>>>>> > wrote:
>>>>>
>>>>>> Hi
>>>>>>
>>>>>> I concur that we are mainly discussing a terminology problem.
>>>>>>
>>>>>> In the context of a Penetration Test or WAPT, this is a Finding.
>>>>>> Reporting this finding makes sense in this context.
>>>>>>
>>>>>> As a professional, you would have to explain if/how this finding is a
>>>>>> Weakness*, a Violation (/Regulations, Compliance, Policies or
>>>>>> Requirements[1])
>>>>>> * I would say Weakness + Exposure = Vulnerability. Vulnerability +
>>>>>> Exploitability (PoC) = Confirmed Vulnerability that needs Business
>>>>>> Impact and Risk Analysis
>>>>>>
>>>>>> So I would probably have reported this Finding as a Weakness (and not
>>>>>> Vulnerability. See: OWASP, WASC-TC, CWE), explaining that it is not
>>>>>> Best Practice (your OWASP link and Cheat Sheets), and even if
>>>>>> mitigative/compensative security controls (Ref Orange Book), security
>>>>>> controls like white listing (or at least black listing. see also
>>>>>> ESAPI) should be 1) part of the [1]security requirements of a proper
>>>>>> SDLC (Build security in) as per Defense-in-Depth security principles
>>>>>> and 2) used and implemented correctly.
>>>>>> NB: A simple Threat Model (i.e. list of CAPEC) would be a solid
>>>>>> support to your report
>>>>>> This would help to evaluate/measure the risk (e.g. CVSS).
>>>>>> Helping the decision/actions around this risk
>>>>>>
>>>>>> PS: interestingly, in this case, I'm not sure that the Separation of
>>>>>> Duties security principle was applied correctly by Google in term of
>>>>>> Risk Acceptance (which could be another Finding)
>>>>>>
>>>>>> So in few words, be careful with the terminology. (don't always say
>>>>>> vulnerability like the media say hacker, see RFC1392) Use a CWE ID
>>>>>> (e.g. CWE-434, CWE-183, CWE-184 vs. CWE-616)
>>>>>>
>>>>>> My 2 bitcents
>>>>>> Sorry if it is not edible :)
>>>>>> Happy Hacking!
>>>>>>
>>>>>> /JA
>>>>>> https://github.com/athiasjerome/XORCISM
>>>>>>
>>>>>> 2014-03-14 7:19 GMT+03:00 Michal Zalewski <lcamtuf@...edump.cx>:
>>>>>> > Nicholas,
>>>>>> >
>>>>>> > I remember my early years in the infosec community - and sadly, so
>>>>>> do
>>>>>> > some of the more seasoned readers of this list :-) Back then, I
>>>>>> > thought that the only thing that mattered is the ability to find
>>>>>> bugs.
>>>>>> > But after some 18 years in the industry, I now know that there's an
>>>>>> > even more important and elusive skill.
>>>>>> >
>>>>>> > That skill boils down to having a robust mental model of what
>>>>>> > constitutes a security flaw - and being able to explain your
>>>>>> thinking
>>>>>> > to others in a precise and internally consistent manner that
>>>>>> convinces
>>>>>> > others to act. We need this because the security of a system can't
>>>>>> be
>>>>>> > usefully described using abstract terms: even the academic
>>>>>> definitions
>>>>>> > ultimately boil down to saying "the system is secure if it doesn't
>>>>>> do
>>>>>> > the things we *really* don't want it to do".
>>>>>> >
>>>>>> > In this spirit, the term "vulnerability" is generally reserved for
>>>>>> > behaviors that meet all of the following criteria:
>>>>>> >
>>>>>> > 1) The behavior must have negative consequences for at least one of
>>>>>> > the legitimate stakeholders (users, service owners, etc),
>>>>>> >
>>>>>> > 2) The consequences must be widely seen as unexpected and
>>>>>> unacceptable,
>>>>>> >
>>>>>> > 3) There must be a realistic chance of such a negative outcome,
>>>>>> >
>>>>>> > 4) The behavior must introduce substantial new risks that go beyond
>>>>>> > the previously accepted trade-offs.
>>>>>> >
>>>>>> > If we don't have that, we usually don't have a case, no matter how
>>>>>> > clever the bug is.
>>>>>> >
>>>>>> > Cheers (and happy hunting!),
>>>>>> > /mz
>>>>>> >
>>>>>> > _______________________________________________
>>>>>> > Full-Disclosure - We believe in it.
>>>>>> > Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>>>>>> > Hosted and sponsored by Secunia - http://secunia.com/
>>>>>>
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> Full-Disclosure - We believe in it.
>>>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>>>> Hosted and sponsored by Secunia - http://secunia.com/
>>>>
>>>
>>>
>>>
>>> --
>>> "There's a reason we separate military and the police: one fights
>>> the enemy of the state, the other serves and protects the people. When
>>> the military becomes both, then the enemies of the state tend to become the
>>> people."
>>>
>>> _______________________________________________
>>> Full-Disclosure - We believe in it.
>>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>>> Hosted and sponsored by Secunia - http://secunia.com/
>>>
>>
>>
>

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