The Skinny channel driver (chan_skinny) in Asterisk before 1.2.22 and 1.4.x before 1.4.8 Business Edition before B.2.2.1 AsteriskNOW before beta7 Appliance Developer Kit before 0.5.0 and s800i before 1.0.2 allows remote attackers to cause a denial of service (crash) via a certain data length value in a crafted packet which results in an \overly large memcpy.\