Secunia

Some vulnerabilities have been reported in Drupal, which can be exploited by malicious people to bypass certain security restrictions, and conduct script insertion and HTTP response splitting attacks.

1) An input validation error in the filtering of HTML code can be exploited to inject arbitrary JavaScript code in submitted content, which will be executed in a user's browser session in context of an affected site when the malicious user data is viewed.

Successful exploitation requires that the user has access to the full HTML input format.

The vulnerability has been reported in versions 4.5.0 through 4.5.5 and 4.6.0 through 4.6.3. Prior versions may also be affected.

2) An input validation error in the attachment handling can be exploited to upload a malicious image with embedded HTML and script content, which will be executed in a user's browser session in context of an affected site when viewed directly with the Microsoft Internet Explorer browser.

This is related to:
SA17295

This can also be exploited to inject arbitrary HTTP headers, which will be included in the response sent to the user.

The vulnerability has been reported in versions 4.5.0 through 4.5.5 and 4.6.0 through 4.6.3. Prior versions may also be affected.

3) The problem is that it is possible to bypass the "access user profile" permission. However, this cannot be exploited to modify data.

Successful exploitation requires that the server runs PHP 5.

The vulnerability has been reported in version 4.6.0 through 4.6.3.

Solution
Update to version 4.5.6 or 4.6.4.
Further details available in Customer Area

Provided and/or discovered by
1) Ahmed Saad
2) Paul Laudanski
3) Andrew Widdowson

Changelog
Further details available in Customer Area

Original Advisory
http://drupal.org/files/sa-2005-007/advisory.txt
http://drupal.org/files/sa-2005-008/advisory.txt
http://drupal.org/files/sa-2005-009/advisory.txt

Other references
Further details available in Customer Area

Deep Links
Links available in Customer Area