A security issue and a vulnerability have been reported in DirectAdmin, which can be exploited by malicious, local users to perform certain actions with escalated privileges, and by malicious people to conduct cross-site scripting attacks.

1) Input passed via the query string to e.g. CMD_REDIRECT is not 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.

2) The application incorrectly follows symlinks while performing backups. This can be exploited to read arbitrary files with root privileges via symlink attacks.

The vulnerability and the security issue are reported in version 1.33.6. Other versions may also be affected.

Solution
Filter malicious characters and character sequences in a proxy. Restrict access to trusted users only.
Further details available to Secunia VIM customers

Provided and/or discovered by
1) r0t
2) alnjm33

Changelog
Further details available to Secunia VIM customers

Original Advisory
1) http://pridels-team.blogspot.com/2009/06/directadmin-v1336-xss-vuln.html
2) http://www.directadmin.com/features.php?id=1052

Deep Links
Links available to Secunia VIM customers