Arista Networks EOS Multiple Vulnerabilities (SA0043)

high Nessus Plugin ID 134419
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Synopsis

The version of Arista Networks EOS running on the remote device is affected by multiple vulnerabilities.

Description

The version of Arista Networks EOS running on the remote device is affected by the following vulnerabilities:

- HTTP/2 implementations are vulnerable to ping floods, potentially leading to a denial of service (DoS).
An unauthenticated, remote attacker can exploit this, by sending continual pings to an HTTP/2 peer, causing the peer to build an internal queue of responses. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both. (CVE-2019-9512)

- HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a DoS. An unauthenticated, remote attacker can open a number of streams and send an invalid request over each stream that should solicit a stream of RST_STREAM frames from the peer. Depending on how the peer queues the RST_STREAM frames, this can consume excess memory, CPU, or both. (CVE-2019-9514)

- HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a DoS. An unauthenticated, remote attacker can exploit this by sending a stream of SETTINGS frames to the peer.
Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalent in behavior to a ping. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both. (CVE-2019-9515)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Apply the patch or or mitigation or upgrade to a fixed version as referenced in the vendor advisory.

See Also

http://www.nessus.org/u?e5070013

Plugin Details

Severity: High

ID: 134419

File Name: arista_eos_sa0043.nasl

Version: 1.4

Type: combined

Family: Misc.

Published: 3/11/2020

Updated: 3/13/2020

Dependencies: arista_eos_detect.nbin

Configuration: Enable paranoid mode

Risk Information

CVSS Score Source: CVE-2019-9515

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:arista:eos

Required KB Items: Host/Arista-EOS/Version, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 11/6/2019

Vulnerability Publication Date: 8/13/2019

Reference Information

CVE: CVE-2019-9512, CVE-2019-9514, CVE-2019-9515