Security when authenticating after sleep

I hope someone can tell me if this is an issue or not. In our house, we have 2 admin accounts on an iMac running 10.5.2 (I'll call the users "1" and "2"). Fast user switching is enabled. On waking from sleep, if user 1 is logged in, user 2 can get past the authenticate dialog by changing the user name to "2" and typing in user 2's password. This then gives user 2 full access to user 1's files. I appreciate that it's much more secure to actually log out each time you finish using the computer, but should this be possible?
Many thanks,
Clinton.

The described behaviour is not a bug - it is intentional. If you look at the "/etc/authorization" file, you will see that the "system.login.screensaver" right is granted to "session-owner-or-admin", i.e. in addition to the owner of the login session, any "admin" user is allowed to unlock the screen lock.
An "admin" needs to be able to administer the computer. The current behaviour predates "fast user switching" - back then, were it not for this feature, if someone on a multi-user machine locked their screen and went home, nobody else would be able to log in without rebooting the system. Even today, if FUS is turned off, the screen saver password dialogue doesn't include an option to switch to the login window.
Also keep in mind that an "admin" user already has full access to the system anyway. They already have access to all unencrypted files, and could turn on "Remote desktop" to access the GUI session. Even a "FileVault" user session can be accessed by an "admin" if the user is already logged in. The ability of an "admin" to unlock another user's screen lock does not introduce any additional security issue.

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Security when authenticating after sleep

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