PT-2018-16843 · Arista · Arista Eos

Published 2018-03-01 · Updated 2019-10-03 · CVE-2018-5255

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Arista EOS versions 4.19 through 4.19.4M Arista EOS versions 4.20 through 4.20.2F

Description The issue allows remote attackers to cause a denial of service, specifically an agent restart, by sending crafted UDP packets to the switch's IP address on a specific UDP port. These malformed UDP packets are not typically expected in production environments and would need to be crafted and sent by a malicious user.

Recommendations For Arista EOS versions 4.19 through 4.19.4M, update to version 4.19.4M or later. For Arista EOS versions 4.20 through 4.20.2F, update to version 4.20.2F or later. As a temporary workaround, consider restricting access to the specific UDP port used by the Mlag agent to minimize the risk of exploitation.

Fix

Related Identifiers

CVE-2018-5255

Affected Products

Arista Eos

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2018-5255 · Security Note
• https://arista.com/en/support/advisories-notices/security-advisories/4347-security-advisory-32 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2018-5255 · Vendor Advisory