BSA-2017-207
21461
31 March 2017
31 March 2017
Closed
Low
3.7
N/A
CVE-2016-7055
Summary
Security Advisory ID : BSA-2017-207
Component : OpenSSL
Revision : 1.0: Interim
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 |