SecurityTracker.com
Keep Track of the Latest Vulnerabilities
with SecurityTracker!
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 
Sign Up
Sign Up for Your FREE Weekly SecurityTracker E-mail Alert Summary
Instant Alerts
Buy our Premium Vulnerability Notification Service to receive customized, instant alerts
Affiliates
Put SecurityTracker Vulnerability Alerts on Your Web Site -- It's Free!
Partners
Become a Partner and License Our Database or Notification Service
Report a Bug
Report a vulnerability that you have found to SecurityTracker
bugs
@
securitytracker.com






Category:   OS (Microsoft)  >   Windows Schannel Vendors:   Microsoft
Windows Schannel TLS Export Cipher Bug Lets Remote Users Downgrade Session Security
SecurityTracker Alert ID:  1031833
SecurityTracker URL:  http://securitytracker.com/id/1031833
CVE Reference:   CVE-2015-1637   (Links to External Site)
Updated:  Mar 10 2015
Original Entry Date:  Mar 5 2015
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 2003 SP2, Vista SP2, 2008 SP2, 7 SP1, 2008 R2 SP1, 8, 8.1, 2012, 2012 R2, RT, RT 8.1; and prior service packs
Description:   A vulnerability was reported in Windows Schannel. A remote user can downgrade the TLS session security and potentially recover keys.

A remote user that can conduct a man-in-the-middle attack can force a downgrade to an export-grade cipher suite and then conduct a key factoring attack to recover the target server's RSA private key. The remote user can then determine the TLS master key for that session.

[Editor's note: This is known as a "FREAK" attack.]

The original advisory is available at:

https://www.smacktls.com/#freak

The miTLS Team reported this vulnerability.

Impact:   A remote user can downgrade the session security and then conduct a key factoring attack to recover the target server's export-grade RSA private key and to obtain the TLS master key for that session.
Solution:   The vendor has issued a fix.

The vendor's advisories are available at:

https://technet.microsoft.com/library/security/ms15-031
https://technet.microsoft.com/library/security/3046015

Vendor URL:  technet.microsoft.com/library/security/ms15-031 (Links to External Site)
Cause:   State error

Message History:   None.


 Source Message Contents



[Original Message Not Available for Viewing]


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

Copyright 2017, SecurityGlobal.net LLC