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Category:   OS (UNIX)  >   Apple macOS/OS X Vendors:   Apple
Apple OS X TLS Export Cipher Bug Lets Remote Users Downgrade Session Security
SecurityTracker Alert ID:  1031830
SecurityTracker URL:  http://securitytracker.com/id/1031830
CVE Reference:   CVE-2015-1067, CVE-2015-2235   (Links to External Site)
Updated:  Apr 8 2015
Original Entry Date:  Mar 4 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): 10.8.5, 10.9.5, 10.10.2
Description:   A vulnerability was reported in Apple OS X. 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.]

For servers or applications that re-use an export-grade RSA private key across multiple sessions, the remote user can then recover or modify the plaintext for all of those sessions.

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 as part of APPLE-SA-2015-03-09-3 Security Update 2015-002.

The vendor's advisory is available at:

https://support.apple.com/kb/HT204413

Vendor URL:  support.apple.com/kb/HT204413 (Links to External Site)
Cause:   State error

Message History:   None.


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