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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(HP Issues Fix for OpenVMS) OpenSSL Montgomery Ladder Timing Lets Local Users Conduct Side-Channel Attacks to Obtain ECDSA Nonces
SecurityTracker Alert ID:  1030446
SecurityTracker URL:  http://securitytracker.com/id/1030446
CVE Reference:   CVE-2014-0076   (Links to External Site)
Date:  Jun 18 2014
Impact:   Disclosure of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0.0l and prior
Description:   A vulnerability was reported in OpenSSL. A local user can obtain Elliptic Curve Digital Signature Algorithm (ECDSA) nonces.

A local user can exploit a timing flaw in the Montgomery ladder implementation during swap operations to perform a FLUSH+RELOAD cache side-channel attack and potentially recover ECDSA nonces.

The original advisory is available at:

http://eprint.iacr.org/2014/140.pdf

Yuval Yarom and Naomi Benger reported this vulnerability.

Impact:   A local user can recover ECDSA nonces.
Solution:   HP has issued a fix for OpenVMS (HP SSL Version 1.4-471).

The HP advisory is available at:

http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay/?docId=emr_na-c04337774-1

Vendor URL:  www.openssl.org/news/secadv_20140605.txt (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  OpenVMS

Message History:   This archive entry is a follow-up to the message listed below.
Apr 8 2014 OpenSSL Montgomery Ladder Timing Lets Local Users Conduct Side-Channel Attacks to Obtain ECDSA Nonces



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