To determine whether DME is enabled on Cisco Nexus 3000 Series Switches, do the following: DME is enabled by default and cannot be disabled on Cisco Nexus 3000 Series Switches that have higher system memory. Determine the Status of the Data Management EngineĭME is disabled by default on Cisco Nexus 3000 Series Switches that have 4 GB of system memory or less. Cisco Discovery Protocol is enabled on at least one interface that allows jumbo frames.įor information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.UCS 6400 Series Fabric Interconnects ( CSCvs10167)įor a device to be vulnerable, both of the following conditions must be true:.Nexus 9000 Series Switches in standalone NX-OS mode ( CSCvr89315).Nexus 3000 Series Switches ( CSCvr89315).This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco NX-OS Software: For a complete list of the advisories and links to them, see Cisco Event Response: August 2020 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. This advisory is part of the August 2020 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes seven Cisco Security Advisories that describe seven vulnerabilities. This advisory is available at the following link:
There are no workarounds that address this vulnerability.
Exploitation of this vulnerability also requires jumbo frames to be enabled on the interface that receives the crafted Cisco Discovery Protocol packets on the affected device.Ĭisco has released software updates that address this vulnerability. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). Note: Cisco Discovery Protocol is a Layer 2 protocol. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the Cisco Discovery Protocol process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. An attacker could exploit this vulnerability by sending a crafted Cisco Discovery Protocol packet to a Layer 2-adjacent affected device. The vulnerability is due to insufficient input validation. A vulnerability in the Data Management Engine (DME) of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device.
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