Arista Networks EOS tcp_input Challenge ACKs Shared Counter Disclosure (SA0023)

medium Nessus Plugin ID 107065

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Synopsis

The version of Arista Networks EOS running on the remote device is affected by an information disclosure vulnerability.

Description

The version of Arista Networks EOS running on the remote device is affected by a flaw in the Linux kernel implementation within file net/ipv4/tcp_input.c due to a failure to properly determine the rate of challenge ACK segments. An unauthenticated, remote attacker can exploit this issue to access the shared counter, thereby making it easier for the attacker to hijack TCP sessions via a blind in-window attack.

Solution

Contact the vendor for a fixed version. Alternatively, apply the hotfix or recommended mitigations referenced in the vendor advisory.

Plugin Details

Severity: Medium

ID: 107065

File Name: arista_eos_sa0023.nasl

Version: 1.7

Type: combined

Family: Misc.

Published: 2/28/2018

Updated: 10/27/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.3

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.5

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

CVSS Score Source: CVE-2016-5696

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.3

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:arista:eos

Required KB Items: Host/Arista-EOS/Version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/15/2016

Vulnerability Publication Date: 7/8/2016

Reference Information

CVE: CVE-2016-5696

BID: 91704

Detections

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