Multiple integer signedness errors in the BGP dissector in Ethereal 0.9.7 and earlier allow remote attackers to cause a denial of service (infinite loop) via malformed messages.
http://www.redhat.com/support/errata/RHSA-2002-290.html
http://www.ethereal.com/cgi-bin/viewcvs.cgi/ethereal/packet-bgp.c.diff?r1=1.68&r2=1.69