critical
9.8
CWE
552
Advisory Published
Updated

CVE-2021-1361: Cisco NX-OS Software Unauthenticated Arbitrary File Actions Vulnerability

First published: Wed Feb 24 2021(Updated: )

A vulnerability in the implementation of an internal file management service for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode that are running Cisco NX-OS Software could allow an unauthenticated, remote attacker to create, delete, or overwrite arbitrary files with root privileges on the device. This vulnerability exists because TCP port 9075 is incorrectly configured to listen and respond to external connection requests. An attacker could exploit this vulnerability by sending crafted TCP packets to an IP address that is configured on a local interface on TCP port 9075. A successful exploit could allow the attacker to create, delete, or overwrite arbitrary files, including sensitive files that are related to the device configuration. For example, the attacker could add a user account without the device administrator knowing.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco NX-OS=9.3\(5\)
Cisco NX-OS=9.3\(6\)
Cisco Nexus 3000
Cisco Nexus 3100 Firmware
Cisco Nexus 3100-Z firmware
Cisco Nexus 3100V Firmware
Cisco Nexus 3200
Cisco Nexus 3400 Firmware
Cisco Nexus 3500 Platform
Cisco Nexus 3600 Firmware
Cisco NX-OS Nexus 9000 Series
Cisco Nexus 92160YC Switch
Cisco Nexus 92300YC Firmware
Cisco Nexus 92304QC Switch
Cisco Nexus 92348GC-X Switch
Cisco Nexus 9236C Switch
Cisco Nexus 9272Q Switch
Cisco Nexus
Cisco Nexus 93108TC-EX-24 Firmware
Cisco Nexus 93108TC-FX Switch
Cisco Nexus 93108TC-FX Switch
Cisco Nexus 93120TX Firmware
Cisco Nexus 93128 Firmware
Cisco Nexus 9316D-GX Firmware
Cisco Nexus 93180LC-EX Switch
Cisco Nexus 93180YC-EX-24
Cisco Nexus 93180YC-EX-24 Firmware
Cisco Nexus 93180YC-FX Firmware
Cisco Nexus 93180YC-FX-24 Firmware
Cisco Nexus 93180YC-FX3 Firmware
Cisco Nexus 93180YC-FX3S Firmware
Cisco Nexus 93216TC-FX2 Firmware
Cisco Nexus 93240YC-FX2 Firmware
Cisco Nexus 9332C Firmware
Cisco Nexus 9332PQ Firmware
Cisco Nexus 93360YC-FX2
Cisco Nexus 9336C-FX2 Firmware
Cisco Nexus 9336C-FX2-E Firmware
Cisco Nexus N9336PQ-X
Cisco Nexus 9348GC-FXP Firmware
Cisco Nexus 93600CD-GX Firmware
Cisco Nexus 9364c-h1
Cisco Nexus 9364C-GX Firmware
Cisco Nexus 9372PX-E
Cisco Nexus 9372PX-E Firmware
Cisco Nexus 9372TX
Cisco Nexus 9372TX-E Switch
Cisco Nexus 9396PX Firmware
Cisco Nexus 9396TX Firmware
Cisco Nexus 9508

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Reference Links

Frequently Asked Questions

  • What is the vulnerability ID for this Cisco Nexus switch vulnerability?

    The vulnerability ID for this Cisco Nexus switch vulnerability is CVE-2021-1361.

  • What is the severity rating of CVE-2021-1361?

    CVE-2021-1361 has a severity rating of 9.1 (critical).

  • Which Cisco Nexus switches are affected by CVE-2021-1361?

    Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode are affected by CVE-2021-1361.

  • How does CVE-2021-1361 impact the affected switches?

    CVE-2021-1361 allows an unauthenticated, remote attacker to create, delete, or overwrite arbitrary files on the affected Cisco Nexus switches.

  • How can I fix the vulnerability CVE-2021-1361?

    To fix the vulnerability CVE-2021-1361, Cisco has released software updates that address the issue. Refer to the Cisco Security Advisory for more information and to download the necessary updates.

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