Tor before 0.1.2.15 can select a guard node beyond the first listed never-before-connected-to guard node, which allows remote attackers with control of certain guard nodes to obtain sensitive information and possibly leverage further attacks.Referenceshttp://osvdb.org/46971http://www.securityfocus.com/bid/25035http://secunia.com/advisories/26140http://www.vupen.com/english/advisories/2007/2634http://archives.seul.org/or/announce/Jul-2007/msg00000.html