Description:
Maksymilian Arciemowicz has reported multiple vulnerabilities in PostNuke, allowing malicious people to conduct cross-site scripting and SQL injection attacks.

1) Input passed to the "catid" parameter in "modules/News/funcs.php", and the "show" parameter in "modules/Downloads/dl-search.php" isn't properly sanitised before being used in a SQL query. This can be exploited to manipulate SQL queries by injecting arbitrary SQL code.

Examples:
index.php?catid='[SQL]
modules.php?op=modload&name=News&file=article&sid=1&catid='[SQL]
admin.php?module=NS-AddStory&op=EditCategory&catid='[SQL]
index.php?name=Downloads&req=search&query=&show=[SQL]

2) Input passed to various parameters in the "Downloads" module isn't properly sanitised before being used. This can be exploited to inject arbitrary HTML and script code, which will get executed in an administrators browser session in context of an affected site when the administrator view new downloads.

The vulnerabilities affect version .750 to .760RC2.

Solution:
Apply updated packages:
http://news.postnuke.com/Article2669.html