BSA-2017-255

Brocade Security Advisory ID

BSA-2017-255

Initial Publication Date

05/02/2017

Last Updated

03/21/2019

Revision

2.0: Final

Risk Impact

Medium

Workaround

Yes

Component

OpenSSH

Affected CVE

CVE-2015-5600

CVSS Score

7.8

Summary

The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.

Affected Products
Brocade Fabric OS - Impacted : Fixed in v7.4.2, v7.4.1d, v8.1.0 and later releases.

Products Confirmed Not Vulnerable
Brocade Network Advisor, Brocade SANnav

Workaround
Limit access to management interface using firewall and/or ipfilter.

Revision History

Version Change Date
1.0 Initial Publication May 2, 2017
2.0 Updated Fabric OS  version and to reflect Brocade Fibre Channel Products only.
Risk Impact updated to Medium
March 21, 2019

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.