Secunia

Some vulnerabilities have been reported in NetClassifieds, which can be exploited by malicious people to conduct SQL injection and cross-site scripting attacks.

1) Input passed to the "CatID" parameter in "ViewCat.php" and "gallery.php", the "ItemNum" parameter in "ViewItem.php", and the "s_user_id" parameter in "ViewCat.php" are not properly sanitised before being used in an SQL query. These can be exploited to manipulate SQL queries by injecting arbitrary SQL code.

2) Input passed to the "CatID" and "s_user_id" parameters in ViewCat.php are not properly sanitised before being returned to the user. These can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

NOTE: Other parameters are reportedly also affected in both cases.

The vulnerabilities have been reported in the following versions:
* NetClassifieds Premium Edition 1.0.1
* NetClassifieds Professional Edition 1.5.1
* NetClassifieds Standard Edition 1.9.6.3 and 1.9.7
* NetClassifieds Free Edition 1.0.1

Other versions may also be affected.

Solution
Edit the source code to ensure that input is properly sanitised.

Provided and/or discovered by
1) r0t
1+2) laurent gaffié

Changelog
Further details available in Customer Area

Original Advisory
http://pridels.blogspot.com/2005/12/netclassifieds-all-versions-sql-inj.html
http://milw0rm.com/exploits/4092

Deep Links
Links available in Customer Area