high
7.2
CWE
264
Advisory Published
Updated

CVE-2019-1730: Cisco NX-OS Software Bash Bypass Guest Shell Vulnerability

First published: Wed May 15 2019(Updated: )

A vulnerability in the Bash shell implementation for Cisco NX-OS Software could allow an authenticated, local attacker to bypass the limited command set of the restricted Guest Shell and execute commands at the privilege level of a network-admin user outside of the Guest Shell. The attacker must authenticate with valid administrator device credentials. The vulnerability is due to the incorrect implementation of a CLI command that allows a Bash command to be incorrectly invoked on the Guest Shell CLI. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the Guest Shell prompt. A successful exploit could allow the attacker to issue commands that should be restricted by a Guest Shell account.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco NX-OS>=7.0\(3\)i4<7.0\(3\)i4\(9\)
Cisco NX-OS>=7.0\(3\)i7<7.0\(3\)i7\(4\)
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 3524-xl
Cisco Nexus 3524-X/XL
Cisco Nexus 3548-X/XL
Cisco Nexus 3548-X/XL
Cisco NX-OS Nexus 9000 Series
Cisco Nexus 92160YC Switch
Cisco Nexus 92300YC Firmware
Cisco Nexus 92304QC Firmware
Cisco Nexus 92348GC-X Switch
Cisco Nexus 9236C
Cisco Nexus 9272Q Switch
Cisco Nexus
Cisco Nexus 93108TC-FX Switch
Cisco Nexus 93120TX Firmware
Cisco Nexus 93128TX
Cisco Nexus 9000 Series Switch
Cisco Nexus 93180YC-EX-24
Cisco Nexus 93180YC-FX 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 N9336PQ-X
Cisco Nexus 9348GC-FXP Firmware
Cisco Nexus 9364c-h1
Cisco Nexus 9372PX-E
Cisco Nexus 9372PX-E Firmware
Cisco Nexus 9372TX Firmware
Cisco Nexus 9372TX-E Switch
Cisco Nexus 9396PX Firmware
Cisco Nexus 9396TX Firmware
Cisco NX-OS>=8.1<8.3\(1\)
Cisco Nexus 7000 Series Switch
Cisco Nexus 7700 Series Switch
Cisco NX-OS>=7.0\(3\)<7.0\(3\)f3\(5\)
Cisco Nexus 36180YC-R Firmware
Cisco Nexus 3636C-R Firmware
Cisco Nexus 9504 Firmware
Cisco Nexus 9508
Cisco Nexus 9516 firmware

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Reference Links

Frequently Asked Questions

  • What is CVE-2019-1730?

    CVE-2019-1730 is a vulnerability in the Bash shell implementation for Cisco NX-OS Software that allows an authenticated, local attacker to bypass the limited command set of the restricted Guest Shell.

  • What is the severity of CVE-2019-1730?

    The severity of CVE-2019-1730 is high with a CVSS score of 6.7.

  • How does CVE-2019-1730 impact Cisco NX-OS Software?

    CVE-2019-1730 allows an attacker to execute commands at the privilege level of a network-admin user outside of the Guest Shell.

  • What is the affected software for CVE-2019-1730?

    The affected software for CVE-2019-1730 is Cisco NX-OS Software versions 7.0(3)i4 through 7.0(3)i4(9) and 7.0(3)i7 through 7.0(3)i7(4).

  • How can I fix CVE-2019-1730?

    To fix CVE-2019-1730, Cisco recommends upgrading to a fixed software release.

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