Unite + Addthis = Datenschutz?

Gestern ist mir beim Starten des Dienstes Unite in Opera aufgefallen, dass in bestimmten Situationen ein unsichtbares 1×1 Pixel-Flash-Objekt in der Webseite eingebunden wird.

Eine kurzen Erklärung: Unite ist ein Dienst von Opera, der Webanwendungen bereitstellt, die auf dem eigenen Browser ablaufen und für andere Benutzer zugänglich sind. Solche Anwendungen sind Chat, Fotoalbum, Datenuploader, Dateisharing und andere.

Auf der eigenen Unite-Seite bindet irgend ein Javascript das unsichtbare Flash-Objekt ein. Das passiert allerdings nur in bestimmten Konstellationen der Browser-Konfiguration, meist wenn Cookies deaktiviert sind, deswegen ist es nicht sofort auffällig.

Screenshot zeigt das durch Flash-Blocker gestoppte Flash-Objekt.

Der unsichtbare Übeltäter sieht im HTML-Code so aus:

<object style="width: 1px; height: 1px; position: absolute; z-index: 100000" id="atff" data="//bin.clearspring.com/at/v/1/button1.6.swf" type="application/x-shockwave-flash">

Dieses Flash-Objekt verbindet sich mit clearspring.com und trackt wohl browserübergreifend Surfende.

Nach Analyse mit Dragonfly bindet ein Javascript von AddThis dieses Objekt ein; der verdächtige HTML-Code der eigenen Unite-Webseite:
<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js?pub=unitedeveloper"></script>

Anbei der Quellcode des verursachenden Skriptes addthis_widget.js:

/* (c) 2008, 2009 Add This, LLC */
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_60=o.share.templates&&o.share.templates[ss]?o.share.templates[ss]:"";o.href="//"+_atd+"bookmark.php?pub="+_euc(addthis_config.username||o.conf.username||_ate.pub())+"&v="+_atc.ver+"&source=tbx-"+_atc.ver+"&s="+ss+"&url="+_euc(_5f.share.url||addthis_share.url||"")+"&title="+_euc(_5f.share.title||addthis_share.title||"")+"&content="+_euc(_5f.share.content||addthis_share.content||"")+(_60?"&template="+_euc(_60):"")+(o.conf.data_track_linkback?"&sms_ss=1":"");o.target="_blank";_12.links.push(o);}else{if(!_23[ss]){o.onclick=function(){return addthis_sendto.call(this,ss,_d(this.conf,_6),_d(this.share,_7));};}else{if(ss=="email"&&(o.conf.ui_use_mailto||_ate.bro.iph)){o.href=_13(o.share);o.onclick=null;_12.ems.push(o);}}}if(!o.title){o.title=_20[ss]?_20[ss]:"Send to "+(_1f[ss]?_1f[ss]:ss.substr(0,1).toUpperCase()+ss.substr(1));}}}if(_46){var app=_46;if(!o.hasChildNodes()){if(_46=="img"){var img=d.ce("img");img.width=125;img.height=16;img.border=0;img.alt="Share";img.src="//s7.addthis.com/static/btn/v2/lg-share-en.gif";app=img;}o.appendChild(app);}}}}},_63=_15(_8,"A","addthis_button_",true),_64=function(_65,_66,_67,_68){for(var i=0;i<_65.length;i++){var b=_65[i];if(b==null){continue;}if(_68!==false||!b.ost){var _66=_66||_4;_67=_67||_5;attr=_37(b,_66,_67,true),hc=0,a="at300";c=b.className||"",s=c.match(/addthis_button_(\w+)(?:\s|$)/),opts=u,sv=s&&s.length?s[1]:0;if(sv){if(!b.childNodes.length){var sp=d.ce("span");b.appendChild(sp);sp.className=a+"bs at15t_"+sv;}else{if(b.childNodes.length==1){var cn=b.childNodes[0];if(cn.nodeType==3){var sp=d.ce("span"),tv=cn.nodeValue;b.insertBefore(sp,cn);sp.className=a+"bs at15t_"+sv;}}else{hc=1;}}if(sv==="compact"){if(!hc&&c.indexOf(a)==-1){b.className+=" "+a+"m";}}else{if(sv==="expanded"){if(!hc&&c.indexOf(a)==-1){b.className+=" "+a+"m";}opts={nohover:true};}else{if(!hc&&c.indexOf(a)==-1){b.className+=" "+a+"b";}opts={singleservice:sv};}}_3d([b],attr,opts);b.ost=1;}}}};_12.update=function(_6e,_6f,_70){if(_6e=="share"){if(!window.addthis_share){window.addthis_share={};}window.addthis_share[_6f]=_70;_7[_6f]=_70;for(var i in _12.links){var o=_12.links[i],rx=new RegExp("&"+_6f+"=(.*)&"),ns="&"+_6f+"="+_euc(_70)+"&";o.href=o.href.replace(rx,ns);if(o.href.indexOf(_6f)==-1){o.href+=ns;}}for(var i in _12.ems){var o=_12.ems[i];o.href=_13(addthis_share);}}else{if(_6e=="config"){if(!window.addthis_config){window.addthis_config={};}window.addthis_config[_6f]=_70;_6[_6f]=_70;}}};_12.button=function(_75,_76,_77){_3d(_75,{conf:_76,share:_77},{internal:"img"});};_12.toolbox=function(_78,_79,_7a){var _7b=_2b(_78);for(var i=0;i<_7b.length;i++){var tb=_7b[i],_7e=_37(tb,_79,_7a),sp=d.ce("div"),c=tb.getElementsByTagName("a");if(c){_64(c,_7e.conf,_7e.share);}tb.appendChild(sp);sp.className="atclear";}};_12.ready=function(){if(this.ost){return;}this.ost=1;var a=".addthis_";_12.toolbox(a+"toolbox");_12.button(a+"button");_64(_63,null,null,false);for(var i=0;i<this.plo.length;i++){_12[this.plo[i].call].apply(this,this.plo[i].args);}};window.addthis=_12;window.addthis.ready();}}));
 

Der Verweis auf clearspring ist darin leicht zu finden wie der folgende Ausschnitt zeigt: swf:"//bin.clearspring.com/at/v/1/button1.6.swf"

Dass sowas in den privaten Unite-Seiten seitens Opera eingebaut wird, finde ich in Bezug auf Datenschutz fragwürdig.

Eigentlich ist Unite ein sehr praktischer Dienst, der auch von Firmen genutzt werden könnte. Allerdings bin ich mir nicht mehr so sicher, ob das praktikabel ist, denn Opera weist nicht darauf hin, dass es externe Dienste beauftragt, irgendwelche Daten zu erfassen oder gar Surfgewohnheiten zu verfolgen.

Opera wird nachbessern müssen in Sachen Datenschutz. Ich bin Drauf und Dran, Opera den Schnüffelbüffel zu verleihen.

Ich habe gestern und heute im Unite-Forum und Desktop-Team-Blog das Problem mit dem Flash-Tracker gepostet. Mal sehen was jetzt passiert.

Eine Suche im Web zu clearspring und AddThis förderte folgende Information zu Tage: ClearSpring acquired AddThis. On October 8, 2008, ClearSpring began sending a ClearSpring Flash Tracking Object ( from http://bin.clearspring.com/at/v/1/svc6.swf ) to sites using the AddThis widget.

Besonders pikant ist die Tatsache, dass Addthis vorher niemals solche Objekte eingebunden hatte, aber nach der Übernahme durch Clearspring ohne jegliche Information dieser zustätzliche Flash-Tracker eingebaut wurde.

Bei Clearspring oder AddThis ist keinerlei Information zu den übertragenen Daten bezüglich der Datensammlung durch das Flash-Objekt zu finden.

Die Nutzung externer Dienste, ganz besonders in den USA ansässige, ist vom Datenschutzgedanken nicht gerade gesegnet.