cisco-sa-20190515-nxos-bash-bypass: 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. 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-20190515-nxos-bash-bypass
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco NX-OS Software |
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Reference Links
Frequently Asked Questions
What is the Cisco NX-OS Software Bash Bypass Guest Shell Vulnerability?
It 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 and execute commands at the privilege level of a network-admin user outside of the Guest Shell.
How does the Cisco NX-OS Software Bash Bypass Guest Shell Vulnerability work?
The vulnerability allows an attacker to bypass the restricted Guest Shell and run commands with the network-admin privilege level.
What is the severity of Cisco NX-OS Software Bash Bypass Guest Shell Vulnerability?
The severity of this vulnerability is medium with a severity value of 6 out of 10.
How can an attacker exploit the Cisco NX-OS Software Bash Bypass Guest Shell Vulnerability?
The attacker needs to have authenticated access to the target device and can then exploit the vulnerability to execute unauthorized commands.
What is the remedy for Cisco NX-OS Software Bash Bypass Guest Shell Vulnerability?
There is no specific remedy provided by Cisco for this vulnerability, but updating the affected software to the latest version may mitigate the risk.
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