Cisco FXOS and NX-OS System Software Authentication, Authorization, and Accounting Denial of Service Vulnerability

Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:

http://ift.tt/1rYuCom

Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.

When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the

Cisco Security Advisories and Alerts page

, to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC:

http://ift.tt/SmQe4o

.

Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.

Fixed Releases

Customers should upgrade to an appropriate release as indicated in the following Cisco product tables.

Firepower 4100 Series Next-Generation Firewall: CSCve03660

Cisco FXOS Major Release - Firepower 4100	First Fixed Release
Prior to 2.3	Affected; migrate to 2.3.1
2.3	2.3.1 (future release)

Firepower 9300 Security Appliance: CSCve03660

Cisco FXOS Major Release - Firepower 9300	First Fixed Release
Prior to 2.3	Affected; migrate to 2.3.1
2.3	2.3

MDS 9000 Series Multilayer Director Switches: CSCvc33141

Cisco NX-OS Software Major Release - MDS	First Fixed Release
5.2	Affected; migrate to 7.3(1)DY(1)
6.2	Affected; migrate to 7.3(1)DY(1)
6.3	Affected; migrate to 7.3(1)DY(1)
7.3	7.3(1)DY(1)
8.1	Not vulnerable
8.2	Not vulnerable

Nexus 1000V Series Switches and Nexus 1100 Series Cloud Services Platforms: CSCux54898

Cisco NX-OS Software Major Release - Nexus 1000V Series Switches and Nexus 1100 Series Cloud Services Platforms	First Fixed Release
Prior to 4.2	No fix available
5.2	No fix available

Nexus 3000 Series Switches: CSCus05214

Cisco NX-OS Software Major Release - Nexus 3000 Series Switches	First Fixed Release
Prior to 6.0	Affected; migrate to 6.0(2)U6(7) or later
6.0	6.0(2)U6(7) or later
7.0	7.0(3)I2(2a) or later

Nexus 3500 Platform Switches: CSCus05214 

Cisco NX-OS Software Major Release - Nexus 3500 Platform Switches	First Fixed Release
Prior to 6.0	Affected; migrate to 6.0(2)A8(3) or later
6.0	6.0(2)A8(3) or later

Nexus 2000, 5000, 5500, 5600, and 6000 Series Switches: CSCuq71257

Cisco NX-OS Software Major Release - Nexus 5000 Series Switches	First Fixed Release
Prior to 5.2	No fix available
5.2	No fix available

Cisco NX-OS Software Major Release - Nexus 2000, 5500, 5600, and 6000 Series Switches	First Fixed Release
Prior to 5.2	Affected; migrate to 7.2(0)N1(1) or later
5.2	Affected; migrate to 7.2(0)N1(1) or later
6.0	Affected; migrate to 7.2(0)N1(1) or later
7.0	Affected; migrate to 7.2(0)N1(1) or later
7.1	Affected; migrate to 7.2(0)N1(1) or later
7.2	7.2(0)N1(1) or later
7.3	7.3(0)N1(1) or later

Nexus 7000 and 7700 Series Switches:  CSCuq58760

Cisco NX-OS Software Major Release - Nexus 7000 and 7700 Series Switches	First Fixed Release
Prior to 5.2	Affected; migrate to 6.2(16) or 7.2(2)D1(1) or later
5.2	Affected; migrate to 6.2(16) or 7.2(2)D1(1) or later
6.0	Affected; migrate to 6.2(16) or 7.2(2)D1(1) or later
6.1	Affected; migrate to 6.2(16) or 7.2(2)D1(1) or later
6.2	6.2(16) or later
7.2	7.2(2)D1(1) or later
7.3	7.3(0)D1(1) or 7.3.0DX(1) or later
8.0	Not vulnerable
8.1	Not vulnerable
8.2	Not vulnerable

Nexus 9000 Series Switches: CSCuq58760

Cisco NX-OS Software Major Release - Nexus 9000 Series Switches	First Fixed Release
6.1	Affected; migrate to 7.0(3)I2(2a) or later
7.0	7.0(3)I2(2a) or later

Nexus 9500 R-Series Line Cards and Fabric Modules: CSCuq58760

Cisco NX-OS Software Major Release - Nexus 9500 R-Series	First Fixed Release
7.0	7.0(3)F2(1) or later

UCS 6100, 6200, and 6300 Fabric Interconnects: CSCur97432¹

Cisco NX-OS Software Major Release - UCS	First Fixed Release
Prior to 2.2	Affected; migrate to 2.2(6c) or later
2.2	2.2(6c) or later
2.5	Not vulnerable
3.0	Affected; migrate to 3.1(2b) or later
3.1	3.1(2b) or later
3.2	Not vulnerable

¹

The fix for Cisco bug ID

CSCur97432

for Cisco UCS 6100, 6200, and 6300 Fabric Interconnects implemented the

login block-for

command. This fix was found to be incomplete, and brute-force attacks that occur over many hours could still cause a device to reset. Cisco bug ID

CSCvd36971

tracks this remaining vulnerability, and the full fix is targeted for future software release 3.2(3).

Cisco NX-OS Release Recommendations

For additional assistance in determining the best Cisco NX-OS System Software release for a Cisco Nexus Switch, refer to the recommended release document for the switch:

To determine the best Cisco NX-OS System Software release for Cisco UCS, refer to the Recommended Releases documents in the release notes for the device.

from Cisco Security Advisory http://ift.tt/2zjbfJY