Arista Networks tcpmss_mangle_packet DoS (SA0034)

critical Nessus Plugin ID 133865

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Synopsis

The version of Arista Networks EOS running on the remote device is affected by a denial of service vulnerability.

Description

The version of Arista Networks EOS running on the remote device is affected by a denial of service (DoS) vulnerability.
The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel allows a remote, unauthenticated attacker to cause a DoS (use-after-free and memory corruption) or possibly have unspecified other impacts by leveraging the presence of xt_TCPMSS in an iptables action.

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

Solution

Upgrade to an Arista Networks EOS version later than 4.20.1FX-Virtual-Router. Alternatively, apply the patch or recommended mitigation referenced in the vendor advisory.

Plugin Details

Severity: Critical

ID: 133865

File Name: arista_eos_sa0034.nasl

Version: 1.4

Type: combined

Family: Misc.

Published: 2/24/2020

Updated: 2/25/2020

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2017-18017

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

Temporal Vector: CVSS:3.0/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: 5/2/2018

Vulnerability Publication Date: 1/3/2018

Reference Information

CVE: CVE-2017-18017

BID: 102367

Detections

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