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

High Nessus Plugin ID 94418


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


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.


Update the affected package.

See Also

Plugin Details

Severity: High

ID: 94418

File Name: freebsd_pkg_6a2cfcdc9dea11e6a29814dae9d210b8.nasl

Version: $Revision: 2.3 $

Type: local

Published: 2016/10/31

Modified: 2016/12/12

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.8

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


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: 2016/10/29

Vulnerability Publication Date: 2016/10/19

Reference Information

CVE: CVE-2016-8858

FreeBSD: SA-16:33.openssh