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Entries from October 2014

Poodle flaw and IoT

The Poodle flaw discovered by Google folks is a big deal. It will not be hard to fix, because for most systems there is just no need to support SSLv3. Fixing those will only imply changing configuration so not to allow SSL fallback. However, this flaw brings to our attention, again, how the weakest link in security often lies in the graceful degradation mechanisms that are there to support interoperability. Logic that degrades security for the sake of interoperability is hard to do right and is often easy to exploit. Exploitation is usually carried out by the attacker connecting while pretending to be “the dumbest” principal, letting the “smarter” principal drop security to as low as it will go.

All this is not new. What may be new is a thought on what such types of flaws may imply on the emerging domain of the Internet-of-Things.

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Snapchat leak -- who is to blame?

Snapchat is in the headlines again for allegedly leaking out nude photos of users. They strictly deny that there was any breach of their servers, and blame third party applications for leaking this data. This might be the case, but it is not enough to take them off the hook, especially given that their product is mostly about confidence. There are more and better instant-messaging apps out there, and whoever uses Snapchat uses it exactly so such events do not happen, whatever the excuse is.

I have no idea what exactly happened, if at all, but if a third party app got to access Snapchat data, then this Snapchat data was either

  • obtained by the third-party app on the user device, or

  • obtained by the third party app by impersonating the legitimate Snapchat app against the Snapchat server.

On a typical (i.e., un-rooted) Android or iOS device, apps can store their data so it is not readily available to other, unauthorized, apps; it would have been careless to leave such photos behind for the asking. On the other hand, Snapchat were accused several months ago for improperly authenticating their clients by the server, allowing easy impersonation of Snapchat client apps. I was quoted in USA Today yesterday addressing the need to properly authenticate clients.

Lastly I will add that there is also the possibility that no breach has ever occurred, and that the entire image dump is a hoax. Time will tell.