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FreeBSD : FreeBSD -- OpenSSH Remote Denial of Service vulnerability (6a2cfcdc-9dea-11e6-a298-14dae9d210b8)

high Nessus Plugin ID 94418

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

When processing the SSH_MSG_KEXINIT message, the server could allocate up to a few hundreds of megabytes of memory per each connection, before any authentication take place. Impact : A remote attacker may be able to cause a SSH server to allocate an excessive amount of memory. Note that the default MaxStartups setting on FreeBSD will limit the effectiveness of this attack.

Solution

Update the affected package.

See Also

https://seclists.org/oss-sec/2016/q4/191

http://www.nessus.org/u?9e0ba9bd

Plugin Details

Severity: High

ID: 94418

File Name: freebsd_pkg_6a2cfcdc9dea11e6a29814dae9d210b8.nasl

Version: 2.6

Type: local

Published: 10/31/2016

Updated: 1/4/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

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

CVSS v3

Risk Factor: High

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: p-cpe:/a:freebsd:freebsd:openssh-portable, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 10/29/2016

Vulnerability Publication Date: 10/19/2016

Reference Information

CVE: CVE-2016-8858

FreeBSD: SA-16:33.openssh