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Category:   OS (Other)  >   Apple iOS Vendors:   Apple
Apple iOS TLS Export Cipher Bug Lets Remote Users Downgrade Session Security
SecurityTracker Alert ID:  1031829
SecurityTracker URL:  http://securitytracker.com/id/1031829
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): prior to 8.2
Description:   A vulnerability was reported in Apple iOS. 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 (8.2).

The vendor's advisory is available at:

https://support.apple.com/kb/HT204423

Vendor URL:  support.apple.com/kb/HT204423 (Links to External Site)
Cause:   State error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Mar 10 2015 (Apple Issues Fix for Apple TV) Apple iOS TLS Export Cipher Bug Lets Remote Users Downgrade Session Security
Apple has issued a fix for Apple TV.
May 19 2015 (Apple Issues Fix for Apple Watch) Apple iOS TLS Export Cipher Bug Lets Remote Users Downgrade Session Security
Apple has issued a fix for Apple Watch.



 Source Message Contents



[Original Message Not Available for Viewing]


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