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OWA (Outlook Webapp) is vulnerable to time-based user enumeration attacks. This module leverages all known, and even some lesser-known services exposed by default Exchange installations to enumerate email.

Error-based user enumeration for Office 365 integrated email addresses

Verification Steps

• Start msfconsole

• use auxiliary/scanner/msmail/exchange_enum

• set (EMAILorEMAIL_FILE)

• run

• creds

Results should look something like below if valid users were found:

host      origin    service        public  private  realm  private_type
----      ------    -------        ------  -------  -----  ------------
<ip>      <ip>      443/tcp (owa)  [email protected]