webcalendar - verbose error message

David Maciejak noticed that webcalendar, a PHP-based multi-user
calendar, returns different error messages on login attempts for an
invalid password and a non-existing user, allowing remote attackers to
gain information about valid usernames.

The old stable distribution (woody) does not contain a webcalendar package.

For the stable distribution (sarge) this problem has been fixed in
version 0.9.45-4sarge4.

For the unstable distribution (sid) this problem will be fixed soon.

We recommend that you upgrade your webcalendar package.