Multiple vulnerabilities in the Cisco Discovery Protocol

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Component Affected

• ASR  9000  Series Aggregation Services Routers
•  Carrier  Routing  System (CRS)
• Firepower 4100 Series
• Firepower 9300  Security Appliances
•  MS XRy 9000  Router
• MDS 9000  Series  Multilayer Switches
• Network Convergence System  (NCS) 540  Series  Routers
• Network Convergence System  (NCS) 560  Series  Routers
• Network Convergence System  (NCS) 1000  Series
• Network  Convergence System (NCS) 5000  Series
• Network Convergence  System (NCS) 5500  Series
• Network  Convergence  System  (NCS) 6000  Series
• Nexus  1000  Virtual Edge  for VMware  vSphere
• Nexus  1000V Switch for Microsoft Hyper - V
• Nexus  1000V  Switch  for VMware vSphere
• Nexus  3000  Series Switches
• Nexus  5500  Platform  Switches
• Nexus  5600  Platform  Switches
• Nexus  6000  Series Switches
• Nexus  7000  Series Switches
• Nexus  9000  Series Fabric  Switches  in  Application Centric Infrastructure (AO) mode
• Nexus  9000  Series Switches  in  standalone NX-OS mode
• UCS 6200  Series Fabric  Interconnects
• UCS 6300  Series Fabric  Interconnects
• UCS 6400  Series Fabric  Interconnects
Overview
These vulnerabilities  have been reported in Cisco  Discovery Protocol  implementation  for Cisco  FXOS  Software, Cisco  IOS XR
Software, and Cisco NX-OS  Software  which could  allow an  unauthenticated,  adjacent  attacker  to execute  arbitrary code  or  cause
a  reload on an affected device.
Description
1. Remote Code Execution Vulnerability  ( CVE-2020-3119 )
A  vulnerability exists in  Cisco Discovery  Protocol implementation for Cisco NX-OS  Software due to the Cisco Discovery Protocol
parser does not properly validate input for certain fields in a Cisco Discovery  Protocol message that could allow an
unauthenticated,  adjacent attacker to execute arbitrary code or cause a  reload on an affected device. An attacker could exploit
this vulnerability by sending a  malicious  Cisco Discovery  Protocol packet to an affected device.
Successful exploitation of this vulnerability could allow the attacker to cause a  stack overflow, which could allow the attacker to
execute arbitrary code with administrative privileges on an affected device.
2. Denial of Service Vulnerability  ( CVE-2020-3120 )
A vulnerability  exists  in Cisco Discovery  Protocol implementation for Cisco  FXOS Software,  Cisco  IOS  XR Software, and Cisco
NX-OS  Software due to a missing check when the affected software processes  Cisco Discovery Protocol messages. That could
allow an attacker on the local network to execute code or cause a denial of service.  An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device.
Successful exploitation of this vulnerability could allow the attacker to exhaust system memory, causing the device to reload.

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