TITLE:
PostNuke Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA18937

VERIFY ADVISORY:
http://secunia.com/advisories/18937/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, Cross Site Scripting, Manipulation of data

WHERE:
>From remote

SOFTWARE:
PostNuke 0.x
http://secunia.com/product/350/

DESCRIPTION:
Maksymilian Arciemowicz has reported some vulnerabilities in
PostNuke, which can be exploited by malicious people to conduct
cross-site scripting and SQL injection attacks, and to bypass certain
security restrictions.

1) It is possible to bypass the HTML tag filter implemented in
"pnVarCleanFromInput()" and "pnAntiCracker()" via specially-crafted
HTML tags.

Example:
<HTMLTAG? <

2) Input passed to the "htmltext" parameter in user.php and to the
"language" parameter in the NS-Languages module isn't properly
sanitised before being returned to the user. This can be exploited to
execute arbitrary HTML and script code in a user's browser session in
context of an affected site.

Example:
http://[host]/user.php?op=edituser&htmltext=[code]
http://[host]/admin.php?module=NS-Languages&op=missing&language=">[code]
http://[host]/admin.php?module=NS-Languages&op=translation&language=[code]

3) An access control error in admin.php can be exploited to access
certain modules like NS-Languages and Banners without requiring admin
privilege.

Example:
http://[host]/admin.php?module=NS-Languages
http://[host]/admin.php?module=Banners

4) Input passed to the "language" parameter in the NS-Languages
module isn't properly sanitised before being used in a SQL query.
This can be exploited to manipulate SQL queries by injecting
arbitrary SQL code. 

Example:
http://[host]/admin.php?module=NS-Languages&op=missing&language=[sql]

Successful exploitation requires that "magic_quotes_gpc" is
disabled.

The vulnerabilities have been reported in version 0.761 and prior.

SOLUTION:
Update to version 0.762.
http://news.postnuke.com/Downloads-req-viewdownload-cid-1.html

PROVIDED AND/OR DISCOVERED BY:
Maksymilian Arciemowicz

ORIGINAL ADVISORY:
PostNuke:
http://news.postnuke.com/index.php?name=News&file=article&sid=2754

SecurityReason:
http://securityreason.com/achievement_securityalert/33

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