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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(IBM Issues Fix for IBM AIX) OpenSSL DSA Signing Constant Timing Bug May Let Remote Users Obtain Potentially Sensitive Information on the Target System
SecurityTracker Alert ID:  1037287
SecurityTracker URL:  http://securitytracker.com/id/1037287
CVE Reference:   CVE-2016-2178   (Links to External Site)
Date:  Nov 15 2016
Impact:   Disclosure of authentication information, Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in OpenSSL. A remote user can obtain potentially sensitive information on the target system.

The DSA signing algorithm may fail to run in constant time when the BN_FLG_CONSTTIME flag is set. A remote user may be able to exploit this to obtain potentially sensitive timing information regarding the cryptographic signature process, including the DSA private key.

The original advisory is available at:

http://eprint.iacr.org/2016/594.pdf

Cesar Pereida (Aalto University), Billy Brumley (Tampere University of Technology), and Yuval Yarom (The University of Adelaide and NICTA) reported this vulnerability.

Impact:   A remote user can obtain potentially sensitive timing information regarding the cryptographic signature process, including the DSA private key.
Solution:   IBM has issued a fix for IBM AIX:

For OpenSSL 1.0.1: openssl-1.0.1.517.tar.Z
For OpenSSL 1.0.2: openssl-1.0.2.1000.tar.Z
For OpenSSL 1.0.1 FIPS: openssl-20.13.101.500.tar.Z
For OpenSSL 1.0.2 FIPS: openssl-20.13.102.1000.tar.Z

The IBM advisory is available at:

https://aix.software.ibm.com/aix/efixes/security/openssl_advisory21.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/openssl_advisory21.asc (Links to External Site)
Cause:   State error
Underlying OS:  UNIX (AIX)
Underlying OS Comments:  5.3, 6.1, 7.1, 7.2

Message History:   This archive entry is a follow-up to the message listed below.
Jun 8 2016 OpenSSL DSA Signing Constant Timing Bug May Let Remote Users Obtain Potentially Sensitive Information on the Target System



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