AIX OpenSSH Advisory : openssh_advisory9.asc

High Nessus Plugin ID 95477

Synopsis

The remote AIX host has a version of OpenSSH installed that is affected by multiple vulnerabilities.

Description

The remote AIX host has a version of OpenSSH installed that is affected by the following vulnerabilities :

- An elevation of privilege vulnerability exists in the do_setup_env() function within file session.c when handling user-supplied environmental variables. A local attacker can exploit this to gain elevated privileges by triggering a crafted environment for the /bin/login program. This vulnerability requires that the UseLogin feature is enabled and that PAM is configured to read .pam_environment files in user home directories.
(CVE-2015-8325)

- A flaw exists when handling authentication requests that involve overly long passwords due to returning shorter response times for requests for invalid users than for valid users. An unauthenticated, remote attacker can exploit this to enumerate valid usernames by conducting a timing attack. (CVE-2016-6210)

- A denial of service vulnerability exists in the auth_password() function within auth-passwd.c due to a a failure to limit password lengths. An unauthenticated, remote attacker can exploit this, via overly long passwords, to cause the excessive consumption of CPU resources. (CVE-2016-6515)

Solution

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

See Also

http://aix.software.ibm.com/aix/efixes/security/openssh_advisory9.asc

Plugin Details

Severity: High

ID: 95477

File Name: aix_openssh_advisory9.nasl

Version: $Revision: 1.2 $

Type: local

Published: 2016/12/02

Modified: 2016/12/05

Dependencies: 12634

Risk Information

Risk Factor: High

CVSSv2

Base Score: 7.8

Temporal Score: 6.4

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

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

CVSSv3

Base Score: 7.5

Temporal Score: 6.9

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

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:X

Vulnerability Information

CPE: cpe:/o:ibm:aix, cpe:/a:openbsd:openssh

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2016/09/08

Vulnerability Publication Date: 2016/04/13

Reference Information

CVE: CVE-2015-8325, CVE-2016-6210, CVE-2016-6515

BID: 86187, 91812, 92212

OSVDB: 137226, 141586, 142342

EDB-ID: 40113, 40136