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I-D ACTION:draft-etienne-ripv2-auth-flaws-00.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.


	Title		: Flaws in RIPv2 packet's authentication
	Author(s)	: J. Etienne
	Filename	: draft-etienne-ripv2-auth-flaws-00.txt
	Pages		: 13
	Date		: 01-May-01
	
The current strongest authentication method for RIPv2 (RFC2453[6])
is the MD5 authentication (RFC2082[5]) which uses shared secret key
to authenticate the packets. This memo explains the different
security flaws we found in the anti-replay and the MACs calculation.
The second part presents practical exploitations of these
weaknesses: an attacker directly connected to a link, can (i)  
break neighborhood, (ii)  flap routes and (iii) inject obsolete
routes.

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