BSA-2017-207

Brocade Security Advisory ID

BSA-2017-207

Initial Publication Date

03/31/2017

Last Updated

03/31/2017

Revision

1.0: Interim

Risk Impact

Low

Workaround

N/A

Component

OpenSSL

Affected CVE

CVE-2016-7055

CVSS Score

3.7

Summary

Severity: Low - There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input.  Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behavior.  Even then only clients that chose the curve will be affected.

Affected Products

Product Current Assessment
Brocade 5400 vRouter Impacted: Fixed in 6.7R12.
Brocade 5600 vRouter Impacted: Fixed in 5.2R1.
Brocade Virtual Traffic Manager

Impacted: Software fixed in 17.1, 10.4r1, 9.9r2, and later.

Impacted: Appliance fixed in 17.1, 10.4r1, 9.9r2, and later.

Brocade Virtual Web Application Firewall Impacted: Fixed in 4.9-41672 and later.

Products Confirmed Not Vulnerable

Brocade Fabric OS, Brocade FastIron OS, Brocade NetIron OS, Brocade Network Advisor, Brocade Network OS, Brocade SDN Controller, Brocade ServerIron ADX, Brocade SLX-OS, and Brocade Virtual ADX are confirmed not affected by this vulnerability.

Workaround

There are no workarounds that address this vulnerability.

Revision History

Version Change Date
1.0 Initial Publication March 31, 2017

Disclaimer

THIS DOCUMENT IS PROVIDED ON AN AS-IS BASIS SOLELY FOR INFORMATIONAL PURPOSES AND DOES NOT IMPLY ANY KIND OF GUARANTY OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. YOUR USE OF THE INFORMATION CONTAINED HEREIN IS AT YOUR OWN RISK. ALL INFORMATION PROVIDED HEREIN IS BASED ON BROCADE'S CURRENT KNOWLEDGE AND UNDERSTANDING OF THE VULNERABILITY AND IMPACT TO BROCADE HARDWARE AND SOFTWARE PRODUCTS. BROCADE RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.