Arista Networks EOS ngx_chain_to_iovec NULL Pointer Deference DoS (SA0021)

high Nessus Plugin ID 107063

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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 vulnerability in NGINX due to a NULL pointer dereference flaw in the ngx_chain_to_iovec() function within file os/unix/ngx_files.c when handling specially crafted requests. An unauthenticated, remote attacker can exploit this, via a specially crafted request to write a client request body to a temporary file, to crash a worker process.

Solution

Contact the vendor for a fixed version, or apply the patch file referenced in the vendor advisory.

Plugin Details

Severity: High

ID: 107063

File Name: arista_eos_sa0021.nasl

Version: 1.8

Type: combined

Family: Misc.

Published: 2/28/2018

Updated: 3/13/2020

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2016-4450

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: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:arista:eos

Required KB Items: Host/Arista-EOS/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 6/13/2016

Vulnerability Publication Date: 5/16/2016

Reference Information

CVE: CVE-2016-4450

BID: 90967

Detections

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