Re: Unexecutable Stack / Buffer Overflow Exploits...

Horst von Brand (vonbrand@sleipnir.valparaiso.cl)
Sun, 02 Jan 2000 00:05:55 -0300


"Homme R. Bitter" <homme@vuurwerk.nl> said:
> On Thu, 30 Dec 1999, Horst von Brand wrote:
> > But the problem would stay exactly the same with an outdated (or just not
> > updated) Linux distribution.

> That applies for every OS, if there isn't any maintenance done and bugs
> keep being discovered, it will become insecure.
> Just because in a few years the patch may not be so useful as it is now,
> is no reason to include it.
> Why bother porting to IA64 if we know the architecture will be obsolete in
> 10 years or so?

> It's useful NOW, so let's include it NOW.

It might be useful NOW, but WON'T BE when it is finally deployed.

> > I didn't say it doesn't. Just that I prefer to get a bind that is immune to
> > this kind of attacks than cores all over the place and a bind that doesn't
> > work because it is being probed from all over the planet.

> This kernelpatch will not repair bind.

Exactly. Fixing the buffer overflows does.

> However, it will, when properly configured, give you warnings about
> certain possible security issues in ANY userspace code run.

Like linking with latest glibc's, which complain if you use several unsafe
functions? Like grep(1)ing for said functions? That was what I used when I
checked out dip(8) a long while ago: I just fixed anything that looked
fishy. Turned out that that killed an exploitable buffer overflow, and
probably a few random reasons for SIGSEGVs too. I was _not_ out looking
specifically for holes, mind you. The cost of doing that is _much_ lower
than demanding patched kernels everywhere (the source for the server
software Linux uses does run on a few other systems too, you know), and it
fixes a lot more than just kiddie intrusions. I wouldn't trust any server
software that was not written with at least that much care.

-- 
Horst von Brand                             vonbrand@sleipnir.valparaiso.cl
Casilla 9G, Viņa del Mar, Chile                               +56 32 672616

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