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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
(Ubuntu Issues Fix) OpenSSL bn_sqrx8x_internal() Carry Bug Lets Remote Users Obtain Potentially Sensitive Information on the Target System in Certain Cases
SecurityTracker Alert ID:  1039740
SecurityTracker URL:  http://securitytracker.com/id/1039740
CVE Reference:   CVE-2017-3736   (Links to External Site)
Date:  Nov 6 2017
Impact:   Disclosure of authentication 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 in certain cases.

A remote user can exploit a carry propagation flaw in the the x86_64 Montgomery squaring function bn_sqrx8x_internal() to potentially determine information about the private key in certain situations.

Processors that support the BMI1, BMI2, and ADX extensions (e.g., Intel Broadwell 5th generation and later, AMD Ryzen) are affected.

EC algorithms are not affected.

The Google OSS-Fuzz project reported this vulnerability.

Impact:   A remote user can potentially determine information about the private key in certain situations.
Solution:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

https://www.ubuntu.com/usn/usn-3475-1

Vendor URL:  www.ubuntu.com/usn/usn-3475-1 (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  14.04 LTS, 16.04 LTS, 17.04, 17.10

Message History:   This archive entry is a follow-up to the message listed below.
Nov 2 2017 OpenSSL bn_sqrx8x_internal() Carry Bug Lets Remote Users Obtain Potentially Sensitive Information on the Target System in Certain Cases



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