Arista Networks EOS ngx_chain_to_iovec NULL Pointer Deference DoS (SA0021)

Medium Nessus Plugin ID 107063

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.

See Also

http://www.nessus.org/u?b364c9b9

Plugin Details

Severity: Medium

ID: 107063

File Name: arista_eos_sa0021.nasl

Version: 1.4

Type: combined

Family: Misc.

Published: 2018/02/28

Modified: 2018/08/09

Dependencies: 107070

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 5

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

CVSSv3

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/o:arista:eos

Required KB Items: Host/Arista-EOS/Version, Host/Arista-EOS/eos_shell

Patch Publication Date: 2016/06/13

Vulnerability Publication Date: 2016/05/16

Reference Information

CVE: CVE-2016-4450

BID: 90967