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Date: Tue Jun 13 16:33:49 2006 From: espen at espen.mine.nu (Espen Grøndahl) Subject: Possible DOS issue in OpenSSH ssh client During some testing I found a possible bug/issue with OpenSSH ssh client. MachineA # cat < /dev/zero | nc ?l ?p 3000 MachineB# ssh someone@...hineA ?p 3000 I have tested on OpenBSD 3.9, CentOS 4.3, Debian 3.1 and Solaris 9. This consumes 50-100% of available CPU time on MachineB ( depending on the bandwith between them ). This could be used in a denial of service attack ? or could be used to stop ( or at least annoy ) ssh bruteforcers :-) But of course it would also consume my upstream bandwith . Espen http://espen.mine.nu <http://espen.mine.nu/> -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20060613/4fb44be2/attachment.html
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