bugtraq - Various router DoS

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Message-ID: <20060304054211.5284.qmail@securityfocus.com>
Date: 4 Mar 2006 05:42:11 -0000
From: ryanmeyer14@...scape.net
To: bugtraq@...urityfocus.com
Subject: Various router DoS

It appears that various routers are prone to an IRC-only DoS attack. Particularly Netgear and Linksys routers have been shown vulnerable.

If a client behind one of the vulnerable routers connects to an IRC server on port 6667 (and only 6667, does not DoS with other ports) and a user posts the following string in either a channel, private message, ctcp, notice, etc.. the router will drop the connection. The string is as follows:

DCC SEND anylongrandomstringhere

It is most commonly being seen as 

DCC SEND "string" 0 0 0 

but that appears to be unneccessary. The string does need to be 15+ chars in length.

Further, it appears the routers that are vulnerable to this are running vxworks as their embedded OS. Older linux Linksys routers appear to be immune.