Re: UDP DoS attack in Win2k via IKE

["Emre Yildirim" <emre () asper org>]

> On Fri, 2001-12-07 at 14:37, c0redump wrote:
>
> has anyone test this against Windows XP  Professional? or Windows 2000
> both result on 60 to 90 % cpu usage, but machine keeps responding. same
> test against a windows 2000 professional with PGPNet instaled gave the
> same result, 100% CPU Usage.

XP Professional gets up to 80% on my machine, but keeps responding.

> Linux with IPSec Support and ipsec enabled gave high cpu usage too. but
> nothing with can render the machine unusable.

Same here, I tried the above with my NetBSD (KAME IPsec) box and the load
averages did go up, but the machine was still fully operational.  Also,
IPsec isnot enabled by default in Windows, so this should not really be a problem.
 Inmost VPN setups, a VPN host is usually behind some sort of packet filter and
only accepts connections to port 500 from clients that need to negotiate key
exchange.

Just my $0.02 on this.


-- 
Emre Yildirim <emre () asper org>
GPG KeyID 0xF9E4A1D1 (pgpkeys.mit.edu)