AIX OpenSSH Vulnerability : openssh_advisory3.asc

Medium Nessus Plugin ID 73308

Synopsis

The remote AIX host is running a vulnerable version of OpenSSH.

Description

The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.

Solution

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

To extract the fixes from the tar file :

zcat OpenSSH_6.0.0.6104.tar.Z | tar xvf -

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

To preview the fix installation :

installp -apYd . OpenSSH_6.0.0.6104

To install the fix package :

installp -aXYd . OpenSSH_6.0.0.6104

See Also

http://aix.software.ibm.com/aix/efixes/security/openssh_advisory3.asc

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

Plugin Details

Severity: Medium

ID: 73308

File Name: aix_openssh_advisory3.nasl

Version: $Revision: 1.3 $

Type: local

Published: 2014/04/02

Modified: 2017/01/10

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 6

Temporal Score: 4.4

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

Temporal Vector: CVSS2#E:U/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: 2014/02/21

Vulnerability Publication Date: 2013/11/08

Reference Information

CVE: CVE-2013-4548

BID: 63605

OSVDB: 99551