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Category:   OS (Microsoft)  >   Windows DLL (Any) Vendors:   Microsoft
Windows Kerberos SNAME Field Integrity Validation Flaw Lets Remote Authenticated Users Bypass Extended Protection for Authentication
SecurityTracker Alert ID:  1038862
SecurityTracker URL:  http://securitytracker.com/id/1038862
CVE Reference:   CVE-2017-8495   (Links to External Site)
Date:  Jul 12 2017
Impact:   Disclosure of user information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7 SP1, 2008 R2 SP1, 2008 SP2, 2012, 8.1, 2012 R2, RT 8.1, 10, 10 Version 1511, 2016, 10 Version 1607, 10 Version 1703
Description:   A vulnerability was reported in Windows Kerberos. A remote authenticated user can bypass security restrictions.

A remote authenticated user that can conduct a man-in-the-middle attack can modify the SNAME field during ticket exchange to bypass Extended Protection for Authentication controls on the target system.

Nico Williams (@cryptonector) of Two Sigma Investments, Jeffrey Eric Altman (@jaltman) of AuriStor, Inc., and Viktor Dukhovni (@vdukhovni) of Two Sigma Investments reported these vulnerabilities.

Impact:   A remote authenticated user can bypass Extended Protection for Authentication controls on the target system.
Solution:   The vendor has issued a fix.

The Microsoft advisory is available at:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8495

Vendor URL:  portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8495 (Links to External Site)
Cause:   Access control error

Message History:   None.


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