Disclose SSRF Vulnerability

From: Alphan Yavaş <alphan.yavas@biznet.com.tr>
To: bugtraq@securityfocus.com,fulldisclosure@seclists.org
Cc:
Subject: Disclose SSRF Vulnerability
Date:


I. VULNERABILITY
-------------------------
Microsoft ADFS 4.0 Windows Server 2016 and previous (Active Directory
Federation Services) Server Side Request Forgery (SSRF)

II. CVE REFERENCE
-------------------------
CVE-2018-16794

III. VENDOR
-------------------------
https://www.microsoft.com
https://msdn.microsoft.com/en-us/library/bb897402.aspx

IV. TIMELINE
-------------------------
15/08/2018 Vulnerability discovered
18/08/2018 Vendor contacted
06/09/2018 Microsoft replay that will fix this in the next version of
Windows Server

V. CREDIT
-------------------------
Alphan Yavas from Biznet Bilisim A.S.

VI. DESCRIPTION
-------------------------
Microsoft ADFS 4.0 Windows Server 2016 and previous versions 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): /adfs/ls
Parameter: txtBoxEmail

Login page of ADFS 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.

-- 




    
    



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gnderildi\u011fi belirtilen 
ki\u015fi/ki\u015filere zeldir ve gizlidir. Bu mesaj 
herhangi bir ama iin 
o\u011falt\u0131lamaz, da\u011f\u0131t\u0131lamaz ve yay\u0131nlanamaz. 
Mesaj\u0131n gnderildi\u011fi ki\u015fi 
de\u011filseniz, mesaj ieri\u011fini ya da eklerini 
kopyalamay\u0131n\u0131z, yay\u0131nlamay\u0131n\u0131z 
ya da ba\u015fka ki\u015filere ynlendirmeyiniz ve 
mesaj\u0131 gnderen ki\u015fiyi derhal 
uyararak bu mesaj\u0131 siliniz. \u015eirketimiz, 
mesaj\u0131n ieri\u011finin ve eklerinin 
size de\u011fi\u015fikli\u011fe u\u011frayarak veya ge 
ula\u015fmas\u0131ndan; gizlili\u011finin 
korunmamas\u0131ndan; virs iermesinden ve 
bilgisayar sisteminize verebilece\u011fi 
herhangi bir zarardan sorumlu 
de\u011fildir


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