The SmarterTools SmarterStats 6.0 web server does not properly validate string data that is intended for storage in an XML document which allows remote attackers to cause a denial of service (parsing error and daemon pause) via vectors involving (1) certain cookies in a SiteInfoLookup action to Admin/frmSites.aspx or certain (2) cookies or (3) parameters to (a) Client/frmViewOverviewReport.aspx (b) Client/frmViewReports.aspx or (c) Services/SiteAdmin.asmx as demonstrated by a >> string related to an \XML injection\ issue.