AIX OpenSSL Advisory : openssl_advisory15.asc

Medium Nessus Plugin ID 88085

Synopsis

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

Description

The version of OpenSSL installed on the remote AIX host is affected by multiple vulnerabilities :

- A NULL pointer dereference flaw exists in file rsa_ameth.c when handling ASN.1 signatures that use the RSA PSS algorithm but are missing a mask generation function parameter. A remote attacker can exploit this to cause the signature verification routine to crash, leading to a denial of service. (CVE-2015-3194)

- A flaw exists in the ASN1_TFLG_COMBINE implementation in file tasn_dec.c related to handling malformed X509_ATTRIBUTE structures. A remote attacker can exploit this to cause a memory leak by triggering a decoding failure in a PKCS#7 or CMS application, resulting in a denial of service. (CVE-2015-3195)

- A race condition exists in s3_clnt.c that is triggered when PSK identity hints are incorrectly updated in the parent SSL_CTX structure when they are received by a multi-threaded client. A remote attacker can exploit this, via a crafted ServerKeyExchange message, to cause a double-free memory error, resulting in a denial of service. (CVE-2015-3196)

Solution

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

See Also

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc

https://www-01.ibm.com/marketing/iwm/iwm/web/preLogin.do?source=aixbp

https://www.openssl.org/news/secadv/20151203.txt

Plugin Details

Severity: Medium

ID: 88085

File Name: aix_openssl_advisory15.nasl

Version: $Revision: 1.8 $

Type: local

Published: 2016/01/22

Modified: 2016/05/16

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 5

Temporal Score: 3.7

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

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

Vulnerability Information

CPE: cpe:/o:ibm:aix, cpe:/a:openssl:openssl

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: 2016/01/18

Vulnerability Publication Date: 2015/12/03

Reference Information

CVE: CVE-2015-3194, CVE-2015-3195, CVE-2015-3196

BID: 78622, 78623, 78626

OSVDB: 131038, 131039, 131040