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From karthik kn <keyan...@gmail.com>
Subject Re: Reg vulnerability for Server State saving
Date Fri, 23 Dec 2016 10:21:04 GMT
Hi All,
Any thoughts on the below ?

On Wed, Dec 21, 2016 at 10:22 AM, karthik kn <keyankay@gmail.com> wrote:

> Hi,
> If i use a new key in web.xml as SECRET, it could be still  exposed to the
> Administrator on accessing the system.
>
> Wont this cause a vulnerability ? Is there any other mechanism of storing
> the secret ?
>
> On Tue, Dec 20, 2016 at 6:52 PM, Moritz Bechler <bechler@agno3.eu> wrote:
>
>> Hi,
>>
>> > Thank you for clarification. Using the secret mentioned in the below
>> page
>> > would suffice or there is some mechanism to generate the SECRET ?
>> >
>>
>> You must not use the keys specified on this page but generate your own
>> secret ones. An attacker using the same key can then produce a valid
>> ViewState token containing an exploit. Also, as noted on the security
>> page and by Leonardo, version up to and including 1.1.7, 1.2.8, 2.0.0
>> are vulnerable to padding oracle attacks (I haven't had a close look but
>> I would be pretty sure that also applies to server side state saving).
>> That means that an attacker may be able to create such tokens without
>> the knowledge of the key - again allowing for the same exploits.
>>
>> So I guess there is no way to be really safe without upgrading.
>>
>>
>> Moritz
>>
>> PS: you also might want to consider using something stronger than DES.
>>
>>
>> --
>> AgNO3 GmbH & Co. KG, Sitz Tübingen, Amtsgericht Stuttgart HRA 728731
>> Persönlich haftend:
>> Metagesellschaft mbH, Sitz Tübingen, Amtsgericht Stuttgart HRB 744820,
>> Vertreten durch Joachim Keltsch
>>
>
>
>
> --
> -------------------------
> Thanks & Regards
>
> Karthik.K.N
>



-- 
-------------------------
Thanks & Regards

Karthik.K.N

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