Re: [Bluez-devel] SDP payload processing vulnerability

[Marcel Holtmann <marcel@holtmann.org>]

Hi Glenn,

> > the SDP part has always been the weak point in every Bluetooth stack.
> > Our server side it pretty good, but it seems the client one is really
> > bad and I must admit that I never looked into in that in details.
> 
> I'm concerned that hcid is also vulnerable to this (which would make
> it both a server and a client problem?).

in theory it is, but you have to trigger a SDP client transaction first
and it is almost impossible to do this remotely. Yes, I can think of
tricks on how to do that, but that is besides the point here.

> > Changing the API is really a problem here. We can't do that. At least
> > not that easily. We can extend the API with more safe calls and then
> > slowly move over the clients.
> 
> That sounds good.  I can write safe versions of the parsing routines
> and move everything I can find over to the new API; old clients will
> still work with the old (unsafe) API.  This may present some
> maintenance challenges since there will be 2x parsing code, but it is
> better than leaving security holes everywhere.

You can have the old API call the new one with a NULL parameter and yes,
it might be confusing, but it is better than breaking the API.

Please use the BlueZ coding style when doing the patch and have small
pieces. I am not going to review the whole think as once. Please send
small updates. It is faster this way.

> Is bluez.org currently down?  I can't seem to get at the latest version...

Yeah. The server lost its routing information. I am working on it.

Use the CVS at bluez.sf.net or the GIT clone at git.infradead.org since
patches against the last release are outdated.

Regards

Marcel



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