cisco-sa-ios-xe-evss-code-exe-8cw5VSvw: Cisco IOS XE Software Easy Virtual Switching System Arbitrary Code Execution Vulnerability
First published: Wed Mar 24 2021(Updated: )
A vulnerability in the Easy Virtual Switching System (VSS) feature of Cisco IOS XE Software for Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code on the underlying Linux operating system of an affected device. The vulnerability is due to incorrect boundary checks of certain values in Easy VSS protocol packets that are destined for an affected device. An attacker could exploit this vulnerability by sending crafted Easy VSS protocol packets to UDP port 5500 while the affected device is in a specific state. When the crafted packet is processed, a buffer overflow condition may occur. A successful exploit could allow the attacker to trigger a denial of service (DoS) condition or execute arbitrary code with root privileges on the underlying Linux operating system of the affected device. 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-ios-xe-evss-code-exe-8cw5VSvw This advisory is part of the March 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: March 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.
Credit: by X.B. CiscoJ.F.D. Cisco
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE | ||
| Cisco Catalyst 4500 Series Switches | ||
| Cisco Catalyst 4500-X Series Switches |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-ios-xe-evss-code-exe-8cw5VSvw?
The vulnerability cisco-sa-ios-xe-evss-code-exe-8cw5VSvw is considered critical due to the potential for unauthenticated remote code execution.
How do I fix cisco-sa-ios-xe-evss-code-exe-8cw5VSvw?
To remediate cisco-sa-ios-xe-evss-code-exe-8cw5VSvw, upgrade the affected Cisco IOS XE software or Catalyst switches to the latest recommended version.
What are the affected devices for cisco-sa-ios-xe-evss-code-exe-8cw5VSvw?
The cisco-sa-ios-xe-evss-code-exe-8cw5VSvw vulnerability affects Cisco Catalyst 4500 Series and Catalyst 4500-X Series Switches running IOS XE software.
What is the exploitability status of cisco-sa-ios-xe-evss-code-exe-8cw5VSvw?
The cisco-sa-ios-xe-evss-code-exe-8cw5VSvw vulnerability is exploitable by an unauthenticated remote attacker, increasing its risk.
What is the impact of cisco-sa-ios-xe-evss-code-exe-8cw5VSvw?
Exploitation of cisco-sa-ios-xe-evss-code-exe-8cw5VSvw could lead to arbitrary code execution on the device's underlying Linux operating system.
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