full-disclosure - Pre-Auth remote crash in NanoSSH on Avaya Ethernet Routing switch (ERS) 5698 and 5698-PoE

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Date: Wed, 17 Jul 2013 13:57:01 +0200
From: Marcus Meissner <meissner@...e.de>
To: full-disclosure@...ts.grok.org.uk
Subject: Pre-Auth remote crash in NanoSSH on Avaya
	Ethernet Routing switch	(ERS) 5698 and 5698-PoE

Hi,

Various openssh 6.2p1 users including our administrators
stumbled over this nice bug in the "nanossh server" during pre authentication
phase within nanossh ( https://www.mocana.com/for-device-manufacturers/nanossh/ )

Bug at openssh bugzilla:
	https://bugzilla.mindrot.org/show_bug.cgi?id=2116
	http://www.gossamer-threads.com/lists/openssh/bugs/55880  

Basically if the HMAC list is unexpected long (>1) the remote nanossh
daemon will crash. Unclear if code execution, but well, I would not bet against it.

Also unclear if more than the listed Nortel switches are affected, or all
nanossh deployers, but probably yes.

Ciao, Marcus

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