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Yahoo! Messenger Shared File Access User Status Enumeration



The remote host may give an attacker information useful for future attacks


The remote host is running a version of Yahoo Instant Messenger that reveals whether a user is on-line or not regardless of whether the user is marked as being "invisible". This information can be determined by trying to access the user's shared files: a different error message is reported if the user is on-line than if the user is off-line.


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