Some attachments cannot be downloaded: 'access denied'

Have a look at:

http://jira.atlassian.com/browse/JRA-6235

and try to download the attachment:

http://jira.atlassian.com/secure/attachment/13060/jirabugs-18Mar05.txt

Despite having all the permissions, I still get a securitybreach.jsp error:

ACCESS DENIED
It seems that you have tried to perform an operation which you are not permitted to perform.
If you feel this message is wrong, please consult your administrators about getting the necessary permissions.

There is at least 1 other issue where this happens. Nothing strange about the file name.