cisco-sa-20180328-smi: Cisco IOS and IOS XE Software Smart Install Denial of Service Vulnerability
First published: Wed Mar 28 2018(Updated: )
A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted packet to an affected device on TCP port 4786. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. Smart Install client functionality is enabled by default on switches that are running Cisco IOS Software releases that have not been updated to address Cisco bug ID CSCvd36820. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi This advisory is part of the March 28, 2018, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 20 Cisco Security Advisories that describe 22 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2018 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS | >CSCvd36820 | |
| Cisco IOS XE Software | >CSCvd36820 |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-20180328-smi?
The severity of cisco-sa-20180328-smi is rated as critical due to the potential for denial of service (DoS) attacks.
How do I fix cisco-sa-20180328-smi?
To mitigate cisco-sa-20180328-smi, update your Cisco IOS or IOS XE Software to the latest version that addresses this vulnerability.
Which devices are affected by cisco-sa-20180328-smi?
cisco-sa-20180328-smi affects devices running Cisco IOS Software and Cisco IOS XE Software with the Smart Install feature enabled.
What kind of attack can cisco-sa-20180328-smi allow?
cisco-sa-20180328-smi allows an unauthenticated, remote attacker to trigger a device reload, causing a denial of service.
Is authentication required to exploit cisco-sa-20180328-smi?
No, exploitation of cisco-sa-20180328-smi does not require authentication, making it particularly serious.
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