AIX OpenSSH Vulnerability : openssh_advisory5.asc

Medium Nessus Plugin ID 85930

Synopsis

The remote AIX host has a vulnerable version of OpenSSH.

Description

The version of OpenSSH running on the remote host is affected by a security bypass vulnerability due to a failure to check the refusal deadline during the forwarding of untrusted X11 connections. A remote attacker can exploit this to bypass timeout checks and XSECURITY restrictions.

Solution

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

To extract the fixes from the tar file :

zcat OpenSSH_6.0.0.6110.tar.Z | tar xvf - (or) zcat OpenSSH_6.0.0.6201.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_6.0.0.6110 (or) installp -apYd . OpenSSH_6.0.0.6201

To install the fix package:

installp -aXYd . OpenSSH_6.0.0.6110 (or) installp -aXYd . OpenSSH_6.0.0.6201

See Also

http://aix.software.ibm.com/aix/efixes/security/openssh_advisory5.asc

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

Plugin Details

Severity: Medium

ID: 85930

File Name: aix_openssh_advisory5.nasl

Version: $Revision: 1.3 $

Type: local

Published: 2015/09/14

Modified: 2016/04/01

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 4.3

Temporal Score: 3.7

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

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

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: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/09/04

Vulnerability Publication Date: 2015/07/01

Reference Information

CVE: CVE-2015-5352

BID: 75525

OSVDB: 124008