AIX OpenSSL Advisory : openssl_advisory3.asc

High Nessus Plugin ID 73561

Synopsis

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

Description

The version of OpenSSL running on the remote host is affected by the following vulnerabilities :

- The DTLS implementation in OpenSSL before 0.9.8s and 1.x before 1.0.0f performs a MAC check only if certain padding is valid, which makes it easier for remote attackers to recover plaintext via a padding oracle attack. (CVE-2011-4108)

- Double free vulnerability in OpenSSL 0.9.8 before 0.9.8s, when X509_V_FLAG_POLICY_CHECK is enabled, allows remote attackers to have an unspecified impact by triggering failure of a policy check. (CVE-2011-4109)

- The SSL 3.0 implementation in OpenSSL before 0.9.8s and 1.x before 1.0.0f does not properly initialize data structures for block cipher padding, which might allow remote attackers to obtain sensitive information by decrypting the padding data sent by an SSL peer.
(CVE-2011-4576)

- The Server Gated Cryptography (SGC) implementation in OpenSSL before 0.9.8s and 1.x before 1.0.0f does not properly handle handshake restarts, which allows remote attackers to cause a denial of service via unspecified vectors. (CVE-2011-4619)

- OpenSSL 0.9.8s and 1.0.0f does not properly support DTLS applications, which allows remote attackers to cause a denial of service via unspecified vectors. NOTE: this vulnerability exists because of an incorrect fix for CVE-2011-4108. (CVE-2012-0050)

Solution

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

To extract the fixes from the tar file :

zcat openssl.0.9.8.1801.tar.Z | tar xvf - or zcat openssl-fips.12.9.8.1801.tar.Z | tar xvf - or zcat openssl.0.9.8.809.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 . openssl

To install the fix package :

installp -aXYd . openssl

See Also

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory3.asc

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

Plugin Details

Severity: High

ID: 73561

File Name: aix_openssl_advisory3.nasl

Version: 1.5

Type: local

Published: 2014/04/16

Modified: 2018/06/12

Dependencies: 12634

Risk Information

Risk Factor: High

CVSSv2

Base Score: 9.3

Temporal Score: 8.1

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

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

Vulnerability Information

CPE: cpe:/o:ibm:aix

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: 2012/03/21

Vulnerability Publication Date: 2012/01/05

Reference Information

CVE: CVE-2011-4108, CVE-2011-4109, CVE-2011-4576, CVE-2011-4619, CVE-2012-0050

BID: 51281, 51563

CERT: 737740