CVE-2021-28500

Published on: 01/14/2022 12:00:00 AM UTC

Last Modified on: 01/14/2022 09:37:00 PM UTC

CVE-2021-28500 - advisory for 71

Source: Mitre Source: Nist Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Certain versions of Arista EOS from Arista Networks contain the following vulnerability:

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.

Vulnerability Patch/Work Around
  • For local users whose authentication is with nopassword, enforce a password or remove the user. Ensure that the following configuration does not exist where a local user is configured with nopassword.
  • To mitigate CVE-2021-28500 with the continued use of the affected agents, a hotfix employing a proxy service can be deployed. The proxy is configured behind the gNMI/gNOI or RESTCONF server. The hotfix can be downloaded at https://www.arista.com/en/support/advisories-notices/sa-download/?sa=71-SecurityAdvisory0071Hotfix.i386.swix for 32 bit systems and https://www.arista.com/en/support/advisories-notices/sa-download/?sa=71-SecurityAdvisory0071Hotfix.x86_64.swix for 64 bit systems.

CVE References

Description Tags Link
Security Advisory 0071 - Arista www.arista.com
text/html
URL Logo MISC www.arista.com/en/support/advisories-notices/security-advisories/13449-security-advisory-0071

Known Affected Software

Vendor Product Version
Arista Networks Arista_EOS<= 4.26.0
Arista Networks Arista_EOS<= 4.25.0
Arista Networks Arista_EOS<= 4.24.6.0
Arista Networks Arista_EOS<= 4.23.0
Arista Networks Arista_EOS<= 4.22.0
Arista Networks Arista_EOS<= 4.21.0
Arista Networks Arista_EOS< 0

Social Mentions

Source Title Posted (UTC)
Twitter Icon @MilesTails My first vulnerability discovery is now public. CVE-2021-28500. Please patch your Aristas if you are using OpenConf… twitter.com/i/web/status/1… 2022-01-11 18:13:44
Twitter Icon @CVEreport CVE-2021-28500 : An issue has recently been discovered in Arista EOS where the incorrect use of EOS's AAA API’s by… twitter.com/i/web/status/1… 2022-01-14 20:12:22
Reddit Logo Icon /r/networking Arista Security Advisory 0071 - Multiple OpenConfig Transport vulnerabilities 2022-01-11 21:02:39
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