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[Full-disclosure] Possible DOS issue in OpenSSH ssh client
- To: <full-disclosure@xxxxxxxxxxxxxxxxx>
- Subject: [Full-disclosure] Possible DOS issue in OpenSSH ssh client
- From: Espen Grøndahl <espen@xxxxxxxxxxxxx>
- Date: Tue, 13 Jun 2006 14:54:51 +0200
During some testing I found a possible bug/issue with OpenSSH ssh client.
MachineA # cat < /dev/zero | nc ?l ?p 3000
MachineB# ssh someone@MachineA ?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/>
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