I. VULNERABILITY
-------------------------
Rollup 18 for Microsoft Exchange Server 2010 SP3 Server Side Request
Forgery (SSRF)

II. CVE REFERENCE
-------------------------
CVE-2018-16793

III. VENDOR
-------------------------
https://www.microsoft.com

IV. TIMELINE
------------------------
19/06/2018 Vulnerability discovered
22/06/2018 Vendor contacted
15/08/2018 Microsoft replay that Update rollup 18 is out of date.

V. CREDIT
-------------------------
Alphan Yavas

VI. DESCRIPTION
-------------------------
Rollup 18 for Microsoft Exchange Server 2010 SP3 and previous versions
are affected from SSRF vulnerability. A remote attacker could force
the vulnerable server to send request to any remote server s/he wants.

VII. PROOF OF CONCEPT
-------------------------
Affected Component:
Path(inurl): /owa/auth/logon.aspx
Parameter: username

Login page of OWA affected from SSRF vulnerability. If username is
being sent with following format victim server will send out DNS
queries to xxx domain.  (xxx is the domain which you want to send
request from server)

username: ssrf.xxx.com\pentest
password: (doesn't matter)

If you want to listen this request you must listen with tcpdump to dns
port your own server(xxx) and you can see callback request.