FreeBSD : openssh -- sshd -- remote valid user discovery and PAM /bin/login attack (adccefd1-7080-11e6-a2cb-c80aa9043978)

High Nessus Plugin ID 93267

Synopsis

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

Description

The OpenSSH project reports :

* sshd(8): Mitigate timing differences in password authentication that could be used to discern valid from invalid account names when long passwords were sent and particular password hashing algorithms are in use on the server. CVE-2016-6210, reported by EddieEzra.Harari at verint.com

* sshd(8): (portable only) Ignore PAM environment vars when UseLogin=yes. If PAM is configured to read user-specified environment variables and UseLogin=yes in sshd_config, then a hostile local user may attack /bin/login via LD_PRELOAD or similar environment variables set via PAM. CVE-2015-8325, found by Shayan Sadigh.

Solution

Update the affected package.

See Also

http://www.openssh.com/txt/release-7.3

http://www.nessus.org/u?c039eb6a

Plugin Details

Severity: High

ID: 93267

File Name: freebsd_pkg_adccefd1708011e6a2cbc80aa9043978.nasl

Version: 2.4

Type: local

Published: 2016/09/02

Updated: 2019/04/11

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.2

Temporal Score: 5.6

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

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

Base Score: 7.8

Temporal Score: 7

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

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2016/09/01

Vulnerability Publication Date: 2016/08/01

Reference Information

CVE: CVE-2015-8325, CVE-2016-6210