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Microsoft Active Directory Logon Hours Username Enumeration Weakness
Microsoft Active Directory is prone to a username-enumeration weakness because of a design error in the application when verifying user-supplied input. Attackers may exploit this weakness to discern valid usernames. This may aid them in brute-force password cracking or other attacks. Microsoft Active Directory on Microsoft Windows Server 2003 Standard Edition is vulnerable; other versions may also be affected. |
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