Headline
CVE-2018-0395: Cisco Security Advisory: Cisco FXOS and NX-OS Software Link Layer Discovery Protocol Denial of Service Vulnerability
A vulnerability in the Link Layer Discovery Protocol (LLDP) implementation for Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition when the device unexpectedly reloads. The vulnerability is due to improper input validation of certain type, length, value (TLV) fields of the LLDP frame header. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface on the targeted device. A successful exploit could allow the attacker to cause the switch to reload unexpectedly.
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: https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
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: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
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
In the following tables, the left column lists releases of Cisco FXOS or NX-OS Software. The right column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability.
Firepower 4100 Series Next-Generation Firewall and Firepower 9300 Security Appliance: CSCvf23367
Cisco FXOS Software Release
First Fixed Release for This Vulnerability
Prior to 2.3
2.3.1.58
2.3
Not vulnerable
MDS 9000 Series Multilayer Switches: CSCuc98542
Cisco NX-OS Software Release
First Fixed Release for This Vulnerability
5.2
6.2(1)
6.2
6.2(1)
7.3
Not vulnerable
8.1
Not vulnerable
8.2
Not vulnerable
Nexus 3000 Series Switches: CSCuc98542
Cisco NX-OS Software Release
First Fixed Release for This Vulnerability
5.0(3)
6.0(2)U1(2)
6.0(2)
6.0(2)U1(2)
7.0(3)
Not vulnerable
9.2(1)
Not vulnerable
Nexus 3500 Platform Switches: CSCuc98542
Cisco NX-OS Software Release
First Fixed Release for This Vulnerability
5.0(3)
6.0(2)A1(1b)
6.0(2)
6.0(2)A1(1b)
7.0(3)
Not vulnerable
9.2(1)
Not vulnerable
Nexus 2000, 5500, 5600, and 6000 Series Switches: CSCuc98542
Cisco NX-OS Software Release
First Fixed Release for This Vulnerability
5.0
7.0(0)N1(1)
5.1
7.0(0)N1(1)
6.0
7.0(0)N1(1)
7.0
Not vulnerable
7.1
Not vulnerable
7.2
Not vulnerable
7.3
Not vulnerable
Nexus 7000 and 7700 Series Switches: CSCuc98542
Cisco NX-OS Software Release
First Fixed Release for This Vulnerability
5.2
5.2(9)
6.1
6.1(3)
6.2
Not vulnerable
7.2
Not vulnerable
7.3
Not vulnerable
8.0
Not vulnerable
8.1
Not vulnerable
8.2
Not vulnerable
Nexus 9000 Series Fabric Switches in ACI Mode: CSCvj94174
Cisco NX-OS Software Release
First Fixed Release for This Vulnerability
Prior to 13.2/3.2
13.2(2l) / 3.2(2l)
13.2/3.2
13.2(2l) / 3.2(2l)
UCS 6100, 6200, and 6300 Series Fabric Interconnects: CSCvj96148
Cisco NX-OS UCS Software Release
First Fixed Release for This Vulnerability
Prior to 2.2
2.2(8l)
2.2
2.2(8l)
3.1
3.1(3j)
3.2
3.2(3g)
4.0
4.0(1a)