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  Microsoft Security Bulletin MS01-047: OWA Function Allows Unauthenticated User to Enumerate Global Address List
Time: 19:42 EST/00:42 GMT | News Source: ActiveWin.com | Posted By: Matthew Sabean

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.

  • The vulnerability would only allow the attacker to learn users’ email aliases. It would not provide any other capabilities. Specifically, it would not give the attacker any way to create or send mail as a user; to read, change or delete mail; or to perform any other functions on the server.
  • The vulnerability is only exploitable via OWA. Exchange servers that are not configured to offer OWA are not affected by the vulnerability.
  • The vulnerability does not affect Exchange 2000, even when offering OWA.

Patch availability:
Microsoft Exchange 5.5: http://www.microsoft.com/Downloads/Release.asp?ReleaseID=32483

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