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Cisco FXOS and NX-OS Software Cisco Discovery Protocol Denial of Service and Arbitrary Code Execution Vulnerability

cisco-sa-nxos-cdp-dos-ce-wWvPucC9 · High · Published · Updated

A vulnerability in the Cisco Discovery Protocol feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper input validation of specific values that are within a Cisco Discovery Protocol message. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges or cause the Cisco Discovery Protocol process to crash and restart multiple times, which would cause the affected device to reload, resulting in a DoS condition. Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cdp-dos-ce-wWvPucC9 This advisory is part of the August 2022 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2022 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

Cisco advisory · CSAF JSON

Workarounds

There are no workarounds that address this vulnerability.

However, customers who do not use Cisco Discovery Protocol can disable the feature either globally, to fully close the attack vector, or on individual interfaces, to reduce the attack surface.
Disable Cisco Discovery Protocol in Cisco FXOS Software
Cisco Discovery Protocol is always enabled and cannot be disabled in Cisco FXOS Software. In Cisco FXOS Software releases 2.1 and later, Cisco Discovery Protocol is enabled on the management (mgmt0) port only.
Disable Cisco Discovery Protocol Globally on Cisco MDS and Nexus Switches that are Running Cisco NX-OS Software
To disable Cisco Discovery Protocol globally on a Cisco MDS or Nexus Switch, use the no cdp enable command in global configuration mode, as shown in the following example:

nxos# conf t
Enter configuration commands, one per line. End with CNTL/Z. nxos(config)# no cdp enable nxos(config)# end nxos# copy running-config startup-config [########################################] 100% Copy complete.

Disable Cisco Discovery Protocol on an Interface on Cisco MDS and Nexus Switches that are Running Cisco NX-OS Software
To disable Cisco Discovery Protocol on an interface on a Cisco MDS or Nexus Switch, use the no cdp enable command in interface configuration mode, as shown in the following example:

nxos# conf t
Enter configuration commands, one per line. End with CNTL/Z. nxos(config)# interface Ethernet1/1 nxos(config-if)# no cdp enable nxos(config-if)# end nxos# copy running-config startup-config [########################################] 100% Copy complete.

Disable Cisco Discovery Protocol on Cisco UCS Fabric Interconnects
Cisco Discovery Protocol cannot be disabled completely on Cisco UCS Fabric Interconnects. Cisco Discovery Protocol can be disabled on server ports and appliance ports on Cisco UCS Fabric Interconnects, but it cannot be disabled on Ethernet uplink ports, Ethernet port channel members, FCoE uplink ports, or management ports.

To disable Cisco Discovery Protocol on the server ports of a Cisco UCS Fabric Interconnect, use the disable cdp command in the default nw-ctrl-policy in the org scope, as shown in the following example:

ucs-fi# scope org
ucs-fi /org # enter nw-ctrl-policy default ucs-fi /org/nw-ctrl-policy # disable cdp ucs-fi /org/nw-ctrl-policy* # exit ucs-fi /org* # exit ucs-fi* # commit-buffer ucs-fi#

To disable Cisco Discovery Protocol on the appliance ports of a Cisco UCS Fabric Interconnect, use the disable cdp command in the default nw-ctrl-policy in the eth-storage scope, as shown in the following example:

ucs-fi* # scope eth-storage
ucs-fi /eth-storage* # enter nw-ctrl-policy default ucs-fi /eth-storage/nw-ctrl-policy* # disable cdp ucs-fi /eth-storage/nw-ctrl-policy* # exit ucs-fi /eth-storage* # exit ucs-fi* # commit-buffer ucs-fi#

While these mitigations have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.

CVEsCVE-2022-20824
Cisco Bug IDsCSCwb74493, CSCwb74498, CSCwb70210, CSCwb74495, CSCwb74494, CSCwb74496, CSCwb74497, CSCwb74513
CVSS ScoreBase 8.8
Base 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco Unified Computing System (Managed), Cisco NX-OS Software 6.0(2)A8(1), Cisco NX-OS Software 6.0(2)A8(2), Cisco NX-OS Software 6.0(2)A8(3), Cisco NX-OS Software 6.0(2)A8(4), Cisco NX-OS Software 6.0(2)A8(4a), Cisco NX-OS Software 6.0(2)A8(5), Cisco NX-OS Software 6.0(2)A8(6), Cisco NX-OS Software 6.0(2)A8(7), Cisco NX-OS Software 6.0(2)A8(7a), Cisco NX-OS Software 6.0(2)A8(7b), Cisco NX-OS Software 6.0(2)A8(8), Cisco NX-OS Software 6.0(2)A8(9), Cisco NX-OS Software 6.0(2)A8(10a), Cisco NX-OS Software 6.0(2)A8(10), Cisco NX-OS Software 6.0(2)A8(11), Cisco NX-OS Software 6.0(2)A8(11a), Cisco NX-OS Software 6.0(2)A8(11b), Cisco NX-OS Software 7.0(3)F3(1), Cisco NX-OS Software 7.0(3)F3(2), Cisco NX-OS Software 7.0(3)F3(3), Cisco NX-OS Software 7.0(3)F3(3a), Cisco NX-OS Software 7.0(3)F3(4), Cisco NX-OS Software 7.0(3)F3(3c), Cisco NX-OS Software 7.0(3)F3(5), Cisco NX-OS Software 7.0(3)I4(1), Cisco NX-OS Software 7.0(3)I4(2), Cisco NX-OS Software 7.0(3)I4(3), Cisco NX-OS Software 7.0(3)I4(4), Cisco NX-OS Software 7.0(3)I4(5), Cisco NX-OS Software 7.0(3)I4(6), Cisco NX-OS Software 7.0(3)I4(7), Cisco NX-OS Software 7.0(3)I4(8), Cisco NX-OS Software 7.0(3)I4(8a), Cisco NX-OS Software 7.0(3)I4(8b), Cisco NX-OS Software 7.0(3)I4(8z), Cisco NX-OS Software 7.0(3)I4(1t), Cisco NX-OS Software 7.0(3)I4(6t), Cisco NX-OS Software 7.0(3)I4(9), Cisco NX-OS Software 7.0(3)I5(1), Cisco NX-OS Software 7.0(3)I5(2), Cisco NX-OS Software 7.0(3)I5(3), Cisco NX-OS Software 7.0(3)I5(3a), Cisco NX-OS Software 7.0(3)I5(3b), Cisco NX-OS Software 7.0(3)I6(1), Cisco NX-OS Software 7.0(3)I6(2), Cisco NX-OS Software 7.0(3)I7(1), Cisco NX-OS Software 7.0(3)I7(2), Cisco NX-OS Software 7.0(3)I7(3), Cisco NX-OS Software 7.0(3)I7(4), Cisco NX-OS Software 7.0(3)I7(5), Cisco NX-OS Software 7.0(3)I7(5a), Cisco NX-OS Software 7.0(3)I7(3z), Cisco NX-OS Software 7.0(3)I7(6), Cisco NX-OS Software 7.0(3)I7(6z), Cisco NX-OS Software 7.0(3)I7(7), Cisco NX-OS Software 7.0(3)I7(8), Cisco NX-OS Software 7.0(3)I7(9), Cisco NX-OS Software 7.0(3)I7(9w), Cisco NX-OS Software 7.0(3)I7(10), Cisco NX-OS Software 7.3(0)D1(1), Cisco NX-OS Software 7.3(0)DX(1), Cisco NX-OS Software 7.3(0)DY(1), Cisco NX-OS Software 7.3(0)N1(1), Cisco NX-OS Software 7.3(0)N1(1b), Cisco NX-OS Software 7.3(0)N1(1a), Cisco NX-OS Software 7.3(1)D1(1), Cisco NX-OS Software 7.3(1)DY(1), Cisco NX-OS Software 7.3(1)N1(1), Cisco NX-OS Software 7.3(2)D1(1), Cisco NX-OS Software 7.3(2)D1(2), Cisco NX-OS Software 7.3(2)D1(3), Cisco NX-OS Software 7.3(2)D1(3a), Cisco NX-OS Software 7.3(2)D1(1d), Cisco NX-OS Software 7.3(2)N1(1), Cisco NX-OS Software 7.3(2)N1(1b), Cisco NX-OS Software 7.3(2)N1(1c), Cisco NX-OS Software 7.3(3)N1(1), Cisco NX-OS Software 8.1(1), Cisco NX-OS Software 8.1(2), Cisco NX-OS Software 8.1(2a), Cisco NX-OS Software 8.1(1a), Cisco NX-OS Software 8.1(1b), Cisco NX-OS Software 8.2(1), Cisco NX-OS Software 8.2(2), Cisco NX-OS Software 8.2(3), Cisco NX-OS Software 8.2(4), Cisco NX-OS Software 8.2(5), Cisco NX-OS Software 8.2(6), Cisco NX-OS Software 8.2(7), Cisco NX-OS Software 8.2(7a), Cisco NX-OS Software 8.2(8), Cisco NX-OS Software 8.3(1), Cisco NX-OS Software 8.3(2), Cisco NX-OS Software 9.2(1), Cisco NX-OS Software 9.2(2), Cisco NX-OS Software 9.2(2t), Cisco NX-OS Software 9.2(3), Cisco NX-OS Software 9.2(3y), Cisco NX-OS Software 9.2(4), Cisco NX-OS Software 9.2(2v), Cisco NX-OS Software 7.3(4)N1(1), Cisco NX-OS Software 7.3(4)N1(1a), Cisco NX-OS Software 7.3(3)D1(1), Cisco NX-OS Software 7.0(3)IA7(1), Cisco NX-OS Software 7.0(3)IA7(2), Cisco NX-OS Software 7.0(3)IM7(2), Cisco NX-OS Software 7.3(4)D1(1), Cisco NX-OS Software 7.3(5)N1(1), Cisco NX-OS Software 8.4(1), Cisco NX-OS Software 8.4(1a), Cisco NX-OS Software 8.4(2), Cisco NX-OS Software 8.4(2a), Cisco NX-OS Software 8.4(3), Cisco NX-OS Software 8.4(2b), Cisco NX-OS Software 8.4(4), Cisco NX-OS Software 8.4(2c), Cisco NX-OS Software 8.4(4a), Cisco NX-OS Software 8.4(5), Cisco NX-OS Software 8.4(2d), Cisco NX-OS Software 9.3(1), Cisco NX-OS Software 9.3(2), Cisco NX-OS Software 9.3(3), Cisco NX-OS Software 9.3(1z), Cisco NX-OS Software 9.3(4), Cisco NX-OS Software 9.3(5), Cisco NX-OS Software 9.3(6), Cisco NX-OS Software 9.3(5w), Cisco NX-OS Software 9.3(7), Cisco NX-OS Software 9.3(7k), Cisco NX-OS Software 9.3(7a), Cisco NX-OS Software 9.3(8), Cisco NX-OS Software 9.3(9), Cisco NX-OS Software 7.3(6)N1(1), Cisco NX-OS Software 7.3(6)N1(1a), Cisco NX-OS Software 7.3(5)D1(1), Cisco NX-OS Software 7.3(7)N1(1), Cisco NX-OS Software 7.3(7)N1(1a), Cisco NX-OS Software 7.3(7)N1(1b), Cisco NX-OS Software 7.3(6)D1(1), Cisco NX-OS Software 7.3(8)N1(1), Cisco NX-OS Software 7.3(8)N1(1a), Cisco NX-OS Software 7.3(8)N1(1b), Cisco NX-OS Software 7.3(7)D1(1), Cisco NX-OS Software 7.3(9)N1(1), Cisco NX-OS Software 8.5(1), Cisco NX-OS Software 7.3(10)N1(1), Cisco NX-OS Software 7.3(8)D1(1), Cisco NX-OS Software 7.3(9)D1(1), Cisco NX-OS Software 7.3(11)N1(1), Cisco NX-OS Software 7.3(11)N1(1a), Cisco Firepower 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System (FXOS) 2.2.2.137, Cisco Firepower Extensible Operating System (FXOS) 2.2.2.148, Cisco Firepower Extensible Operating System (FXOS) 2.2.2.149, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.99, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.93, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.91, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.88, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.75, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.73, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.66, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.58, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.130, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.111, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.110, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.144, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.145, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.155, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.166, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.173, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.179, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.180, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.56, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.190, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.215, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.216, Cisco Firepower Extensible Operating System (FXOS) 2.3.1.219, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.131, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.157, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.166, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.169, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.174, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.187, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.192, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.204, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.214, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.224, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.229, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.230, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.238, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.239, Cisco Firepower Extensible Operating System (FXOS) 2.6.1.254, Cisco Firepower Extensible Operating System (FXOS) 2.8.1.105, Cisco Firepower Extensible Operating System (FXOS) 2.8.1.125, Cisco Firepower Extensible Operating System (FXOS) 2.8.1.139, Cisco Firepower Extensible Operating System (FXOS) 2.8.1.143, Cisco Firepower Extensible Operating System (FXOS) 2.8.1.152, Cisco Firepower Extensible Operating System (FXOS) 2.8.1.162, Cisco Firepower Extensible Operating System (FXOS) 2.8.1.164, Cisco Firepower Extensible Operating System (FXOS) 2.8.1.172, Cisco Firepower Extensible Operating System (FXOS) 2.8.1.186, Cisco Firepower Extensible Operating System (FXOS) 2.10.1.159, Cisco Firepower Extensible Operating System (FXOS) 2.10.1.166, Cisco Firepower Extensible Operating System (FXOS) 2.10.1.179, Cisco Firepower Extensible Operating System (FXOS) 2.11.1.154, Cisco Firepower Extensible Operating System (FXOS) 2.12.0.31, Cisco NX-OS System Software in ACI Mode 13.2(1l), Cisco NX-OS System Software in ACI Mode 13.2(1m), Cisco NX-OS System Software in ACI Mode 13.2(2l), Cisco NX-OS System Software in ACI Mode 13.2(2o), Cisco NX-OS System Software in ACI Mode 13.2(3i), Cisco NX-OS System Software in ACI Mode 13.2(3n), Cisco NX-OS System Software in ACI Mode 13.2(3o), Cisco NX-OS System Software in ACI Mode 13.2(3r), Cisco NX-OS System Software in ACI Mode 13.2(4d), Cisco NX-OS System Software in ACI Mode 13.2(4e), Cisco NX-OS System Software in ACI Mode 13.2(3j), Cisco NX-OS System Software in ACI Mode 13.2(3s), Cisco NX-OS System Software in ACI Mode 13.2(5d), Cisco NX-OS System Software in ACI Mode 13.2(5e), Cisco NX-OS System Software in ACI Mode 13.2(5f), Cisco NX-OS System Software in ACI Mode 13.2(6i), Cisco NX-OS System Software in ACI Mode 13.2(41d), Cisco NX-OS System Software in ACI Mode 13.2(7f), Cisco NX-OS System Software in ACI Mode 13.2(7k), Cisco NX-OS System Software in ACI Mode 13.2(9b), Cisco NX-OS System Software in ACI Mode 13.2(8d), Cisco NX-OS System Software in ACI Mode 13.2(9f), Cisco NX-OS System Software in ACI Mode 13.2(9h), Cisco NX-OS System Software in ACI Mode 13.2(10e), Cisco NX-OS System Software in ACI Mode 13.2(10f), Cisco NX-OS System Software in ACI Mode 13.2(10g), Cisco NX-OS System Software in ACI Mode 14.0(1h), Cisco NX-OS System Software in ACI Mode 14.0(2c), Cisco NX-OS System Software in ACI Mode 14.0(3d), Cisco NX-OS System Software in ACI Mode 14.0(3c), Cisco NX-OS System Software in ACI Mode 14.1(1i), Cisco NX-OS System Software in ACI Mode 14.1(1j), Cisco NX-OS System Software in ACI Mode 14.1(1k), Cisco NX-OS System Software in ACI Mode 14.1(1l), Cisco NX-OS System Software in ACI Mode 14.1(2g), Cisco NX-OS System Software in ACI Mode 14.1(2m), Cisco NX-OS System Software in ACI Mode 14.1(2o), Cisco NX-OS System Software in ACI Mode 14.1(2s), Cisco NX-OS System Software in ACI Mode 14.1(2u), Cisco NX-OS System Software in ACI Mode 14.1(2w), Cisco NX-OS System Software in ACI Mode 14.1(2x), Cisco NX-OS System Software in ACI Mode 14.2(1i), Cisco NX-OS System Software in ACI Mode 14.2(1j), Cisco NX-OS System Software in ACI Mode 14.2(1l), Cisco NX-OS System Software in ACI Mode 14.2(2e), Cisco NX-OS System Software in ACI Mode 14.2(2f), Cisco NX-OS System Software in ACI Mode 14.2(2g), Cisco NX-OS System Software in ACI Mode 14.2(3j), Cisco NX-OS System Software in ACI Mode 14.2(3l), Cisco NX-OS System Software in ACI Mode 14.2(3n), Cisco NX-OS System Software in ACI Mode 14.2(3q), Cisco NX-OS System Software in ACI Mode 14.2(4i), Cisco NX-OS System Software in ACI Mode 14.2(4k), Cisco NX-OS System Software in ACI Mode 14.2(4o), Cisco NX-OS System Software in ACI Mode 14.2(4p), Cisco NX-OS System Software in ACI Mode 14.2(5k), Cisco NX-OS System Software in ACI Mode 14.2(5l), Cisco NX-OS System Software in ACI Mode 14.2(5n), Cisco NX-OS System Software in ACI Mode 14.2(6d), Cisco NX-OS System Software in ACI Mode 14.2(6g), Cisco NX-OS System Software in ACI Mode 14.2(6h), Cisco NX-OS System Software in ACI Mode 14.2(6l), Cisco NX-OS System Software in ACI Mode 14.2(7f), Cisco NX-OS System Software in ACI Mode 14.2(7l), Cisco NX-OS System Software in ACI Mode 14.2(6o), Cisco NX-OS System Software in ACI Mode 14.2(7q), Cisco NX-OS System Software in ACI Mode 14.2(7r), Cisco NX-OS System Software in ACI Mode 14.2(7s), Cisco NX-OS System Software in ACI Mode 14.2(7t), Cisco NX-OS System Software in ACI Mode 15.0(1k), Cisco NX-OS System Software in ACI Mode 15.0(1l), Cisco NX-OS System Software in ACI Mode 15.0(2e), Cisco NX-OS System Software in ACI Mode 15.0(2h), Cisco NX-OS System Software in ACI Mode 15.1(2e), Cisco NX-OS System Software in ACI Mode 15.1(3e), Cisco NX-OS System Software in ACI Mode 15.1(4c), Cisco NX-OS System Software in ACI Mode 15.2(1g), Cisco NX-OS System Software in ACI Mode 15.2(2e), Cisco NX-OS System Software in ACI Mode 15.2(2f), Cisco NX-OS System Software in ACI Mode 15.2(2g), Cisco NX-OS System Software in ACI Mode 15.2(2h), Cisco NX-OS System Software in ACI Mode 15.2(3e), Cisco NX-OS System Software in ACI Mode 15.2(3f), Cisco NX-OS System Software in ACI Mode 15.2(3g), Cisco NX-OS System Software in ACI Mode 15.2(4d), Cisco NX-OS System Software in ACI Mode 15.2(4e), Cisco NX-OS System Software in ACI Mode 15.2(4f), Cisco Firepower Extensible Operating System (FXOS), Cisco NX-OS Software, Cisco NX-OS System Software in ACI Mode, Cisco MDS 9000 Multilayer Directors and Fabric Switches, Cisco Nexus 7000 Series Switches, Cisco Nexus 5000 Series Switches, Cisco Nexus 3000 Series Switches, Cisco Nexus 6000 Series Switches, Cisco Nexus 9000 Series Switches, Cisco Firepower 9000 Series, Cisco Firepower 4100 Series

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