AIX OpenSSH Vulnerability : openssh_advisory4.asc

Medium Nessus Plugin ID 76168

Synopsis

The remote AIX host has a vulnerable version of OpenSSH.

Description

The version of OpenSSH running on the remote host is affected by multiple security bypass vulnerabilities :

- sshd in OpenSSH versions before 6.6 do not properly support wildcards on AcceptEnv lines in sshd_config, which allow a remote attacker to bypass intended environment restrictions by using a substring located before a wildcard character. (CVE-2014-2532)

- The verify_host_key function in sshconnect.c in the OpenSSH client for versions 6.6 and earlier allows remote servers to trigger the skipping of SSHFP DNS checking by presenting an unacceptable HostCertificate.
(CVE-2014-2653)

Solution

A fix is available and can be downloaded from the AIX website.

To extract the fixes from the tar file :

zcat OpenSSH_6.0.0.6107.tar.Z | tar xvf -

IMPORTANT : If possible, it is recommended that an mksysb backup of the system be created. Verify it is both bootable and readable before proceeding.

To preview the fix installation :

installp -apYd . OpenSSH_6.0.0.6107

To install the fix package :

installp -aXYd . OpenSSH_6.0.0.6107

See Also

http://aix.software.ibm.com/aix/efixes/security/openssh_advisory4.asc

https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp

Plugin Details

Severity: Medium

ID: 76168

File Name: aix_openssh_advisory4.nasl

Version: $Revision: 1.5 $

Type: local

Published: 2014/06/20

Modified: 2016/05/04

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 5.8

Temporal Score: 5.5

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

Temporal Vector: CVSS2#E:F/RL:U/RC:ND

Vulnerability Information

CPE: cpe:/o:ibm:aix:5.3, cpe:/o:ibm:aix:6.1, cpe:/o:ibm:aix:7.1

Required KB Items: Host/AIX/lslpp, Host/local_checks_enabled, Host/AIX/version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2014/06/17

Vulnerability Publication Date: 2014/03/15

Reference Information

CVE: CVE-2014-2532, CVE-2014-2653

BID: 66355, 66459

OSVDB: 104578, 105011