Vulnerability Development mailing list archives

Re: ping flooding as normal user


From: Bluefish <11a () GMX NET>
Date: Tue, 15 Aug 2000 07:45:13 +0200

I'm no expert on network coding in the unix environment (or any other
environment for that sake ;) but I'm wondering how big this issue is. I
mean, basicly the main problem is that bandwidth per user isn't limited
(for a number of sites, being able to limit that for ordinary users might
be interesting - not only to avoid abuse)

Secondary, why is ping suid? is this needed for sending these IMCP
packets? If this can be by any user application I really don't think
there's anything to fix in ping, then it would be a something to patch in
the kernels, if it is concidered a needed feature.

-s parameter of ping command has no upper limit for normal users.
This allows normal users to send for example 1 * 60000 bytes of ICMP data
per second (from one copy of ping invoked)
I think it's just great for DoSing ;o)

Windows 95 ping is way more "flood friendly" than the gnu ping, btw.

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    eleventh alliance development & security team


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