CVE-2021-28496

In Arista's EOS software affected releases, the shared secret profiles sensitive configuration might be leaked when displaying output over eAPI or other JSON outputs to authenticated users on the device.

Description

On systems running Arista EOS and CloudEOS with the affected release version, when using shared secret profiles the password configured for use by BiDirectional Forwarding Detection (BFD) will be leaked when displaying output over eAPI or other JSON outputs to other authenticated users on the device. The affected EOS Versions are: all releases in 4.22.x train, 4.23.9 and below releases in the 4.23.x train, 4.24.7 and below releases in the 4.24.x train, 4.25.4 and below releases in the 4.25.x train, 4.26.1 and below releases in the 4.26.x train

Remediation

Solution:

  • The recommended resolution is to upgrade to a remediated software version at your earliest convenience. The vulnerability is fixed in the following EOS versions: 4.23.10 and later releases 4.24.8 and later releases 4.25.5 and later releases 4.26.2 and later releases
  • For an immediate remediation until EOS can be upgraded, a hotfix SWIX is available to be installed as EOS extension to fix the issue. Release versions: 4.22.0 - 4.25.0 URL: https://www.arista.com/assets/data/SecurityAdvisories/SA69/SecurityAdvisory0069Hotfix-4.22-4.25.0.swix SWIX hash: (SHA512)36fc77d7ff5de2aacfff822bac4e054137a5ebf7d54f283cd4d4be05f15a2c1e448245080e0be11122831bb672d1d777724a8bcbbf029e32a3611d6002e2cf10 Release versions: 4.25.1 - 4.26.1 URL: https://www.arista.com/assets/data/SecurityAdvisories/SA69/SecurityAdvisory0069Hotfix-4.25.1-4.26.1.swix SWIX hash: (SHA512)c8d5a8ab801c7e45dbc0f062f738f3af72084b451a7734c5607a884d648d88b37d7a8451d09dd0a051728199f4b6b0c0bef76b5c3862a668298410cbce55e085

Workaround:

  • The restriction of access to the related CLI show command of specified role type can be used as an immediate mitigation. The detailed instructions of role-based authorization can be found at https://www.arista.com/um-eos/eos-user-security#xx1347683.

Categories

5.7
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.09%
Vendor Advisory arista.com
Affected: Arista Networks Arista EOS
Published at:
Updated at:

References

Link Tags
https://www.arista.com/en/support/advisories-notices/security-advisories/13243-security-advisory-0069 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-28496?
CVE-2021-28496 has been scored as a medium severity vulnerability.
How to fix CVE-2021-28496?
To fix CVE-2021-28496: The recommended resolution is to upgrade to a remediated software version at your earliest convenience. The vulnerability is fixed in the following EOS versions: 4.23.10 and later releases 4.24.8 and later releases 4.25.5 and later releases 4.26.2 and later releases
Is CVE-2021-28496 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-28496 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-28496?
CVE-2021-28496 affects Arista Networks Arista EOS.
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