On 27/08/07, Kees Cook wrote:
> Each Linux distribution has a very limited set of possible kernel
> versions.  It is nearly trivial to guess at someone's kernel version.

Well, there is a limited number of possible hardware architectures,
operating systems, and software versions. If the attacker can afford
guessing, this "feature" of Pidgin is indeed useless for him.

However, there are two possible uses for knowing the victim's
configuration *exactly* in advance: hiding the attacker's activity and
increasing the success rate of one-shot exploits (for worms). Details
can be found in the "Sample attack schemes" section of my original
report.

> Also, "4. Authorize the attacker from the victim client." requires the
> victim do some work to help the attacker.  :)

That's good but it doesn't add too much protection, as I argue in the
original report.

> I don't find this to be a significant "information disclosure".

Frankly, I don't consider this a significant information disclosure
either. It's an insignificant one. :-) Most importantly, I'd like to
make sure that this issue is not ignored and will be eventually fixed.

-- 
Jabber: Client and OS version visible to authorized buddies
https://bugs.launchpad.net/bugs/128159
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