Disable the feature using the no vstack configuration command on the device. Columns The combined count of all the columns from each of the array arguments. The resulting array will be the following dimensions: Rows The maximum of the row count from each of the array arguments. Information within this article is “as is”, without warranty of any sort. The vulnerability currently affects devices which have the Client role. HSTACK returns the array formed by appending each of the array arguments in a column-wise fashion. Furthermore, the author is not liable for any direct or indirect damages or expense incurred which may result from the use of the information covered within this article. Persons accessing this information assume full responsibility for the use and agree to not use this content for any illegal purpose. This article is made available for educational purposes only!!! In addition, this article provides general information on cyber security topics used for “Ethical Hacking”. In addition, SSH access should be limited by ACL to authorized personnel. Lastly, it should be best practice to use Type 5 based complexed passwords when possible.
VSTACK VULNERABILITY INSTALL
In addition, Cisco recommended using the security best practice of adding an ACL (Access Control List) to the switch or switches to control Smart Install client access for TCP Port 4786. Thus, the next recommendation was to upgrade or downgrade IOS. Summary The Cyber Fusion Center has learned of malicious, seemly automated, exploitation of recent Cisco IOS and Cisco IOS XE critical vulnerabilities (CVE-2018-0171 & CVE-2018-0156) within Cisco Smart Install to cause mass network outages.
However, Cisco has acknowledged that the command may not be available in certain IOS versions and should refer to BugID CSCtj75729. As to mitigating CVE-2018–0171 as well as the “feature enhancement” for the Cisco Smart Install, Cisco recommended that customers not using the feature should disable it with the command of no vstack.
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