.... Global Address List
Among the functions Outlook Web Access (OWA) in Exchange 5.5 offers is the ability to search the global address list (GAL). By design, this is an authenticated function, implemented as a two-tier architecture - a front tier that provides a user interface and a back-end tier that actually performs the search. However, only the front tier actually checks authentication. An attacker who sent a properly formatted request to the back-end function that actually performs the search could enumerate the GAL without authenticating.
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Among the functions Outlook Web Access (OWA) in Exchange 5.5 offers is the ability to search the global address list (GAL). By design, this is an authenticated function, implemented as a two-tier architecture - a front tier that provides a user interface and a back-end tier that actually performs the search. However, only the front tier actually checks authentication. An attacker who sent a properly formatted request to the back-end function that actually performs the search could enumerate the GAL without authenticating.
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