CVE-2021-28500: An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.

Q: What is CVE-2021-28500?

CVE-2021-28500 is a vulnerability in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with no password configuration.

Q: How does CVE-2021-28500 affect Arista EOS?

CVE-2021-28500 affects Arista EOS by allowing local users with nopassword configuration to gain unrestricted access to the device due to the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents.

Q: What is the severity of CVE-2021-28500?

CVE-2021-28500 has a severity rating of critical (7.8).

Q: Which versions of Arista EOS are affected by CVE-2021-28500?

Arista EOS versions 4.20 up to exclusive version 4.26.1f are affected by CVE-2021-28500.

Q: How can I fix CVE-2021-28500?

To fix CVE-2021-28500, it is recommended to update Arista EOS to a version that is not affected by the vulnerability.

Published Jan 14, 2022

Updated

An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by the OpenConfig and TerminAttr agents could result in unrestricted access to the device for local users with nopassword configuration.

Affected Software

7 affected components

Arista EOS<4.20

Arista EOS>=4.21.0<=4.21.14m

Arista EOS>=4.22.0<=4.22.11m

Arista EOS>=4.23.0<=4.23.8m

Arista EOS>=4.24.6.0<=4.24.6m

Arista EOS>=4.25.0<=4.25.4m

Arista EOS>=4.26.0<=4.26.1f

Remediation

Patch Available

https://www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071

Information

The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Artista recommends customers move to the latest version of each release that contains all the fixes listed below. CVE-2021-28500 has been fixed in the following releases: 4.26.2F and later releases in the 4.26.x train 4.25.5M and later releases in the 4.25.x train 4.25.4.1M and later releases in the 4.25.4.x train 4.24.7M and later releases in the 4.24.x train 4.23.9M and later releases in the 4.23.x train 4.22.12M and later releases in the 4.22.x train 4.21.15M and later releases in the 4.21.x train

Event History

Jan 14, 2022

CVE Published

via MITRE·07:11 PM

Data Sourced

via MITRE·07:11 PM

RemedyDescriptionSeverityWeakness

Frequently Asked Questions

What is CVE-2021-28500?