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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Ubuntu Issues Fix) OpenSSL ecdsa_sign_setup() Timing Flaw Lets Local Users Recover Private Keys
SecurityTracker Alert ID:  1037752
SecurityTracker URL:  http://securitytracker.com/id/1037752
CVE Reference:   CVE-2016-7056   (Links to External Site)
Date:  Jan 31 2017
Impact:   Disclosure of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.0.1u and prior
Description:   A vulnerability was reported in OpenSSL. A local user can recover ECDSA P-256 private keys.

The ecdsa_sign_setup() function in 'crypto/ec/ecdsa_ossl.c' does not properly set the BN_FLG_CONSTTIME for nonces when signing with the P-256 elliptic curve. As a result, a local user can conduct a cache-timing attack to exploit this side channel timing flaw in the signing function and recover ECDSA P-256 private keys.

The original advisory is available at:

http://eprint.iacr.org/2016/1195
http://eprint.iacr.org/2016/1195.pdf

Cesar Pereida Garcia and Billy Bob Brumley (Tampere University of Technology) reported this vulnerability.

Impact:   A local user can recover ECDSA P-256 private keys.
Solution:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-3181-1

Vendor URL:  www.ubuntu.com/usn/usn-3181-1 (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 LTS, 14.04 LTS, 16.04 LTS, 16.10

Message History:   This archive entry is a follow-up to the message listed below.
Jan 10 2017 OpenSSL ecdsa_sign_setup() Timing Flaw Lets Local Users Recover Private Keys



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