AIX OpenSSH Vulnerability : openssh_advisory5.asc

This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.


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.

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

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

Risk factor :

Medium / CVSS Base Score : 4.3
(CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N)
CVSS Temporal Score : 3.7
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : false

Family: AIX Local Security Checks

Nessus Plugin ID: 85930 ()

Bugtraq ID: 75525

CVE ID: CVE-2015-5352

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