AIX OpenSSL Advisory : openssl_advisory15.asc

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


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)

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

Solution :

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

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 3.7
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: AIX Local Security Checks

Nessus Plugin ID: 88085 ()

Bugtraq ID: 78622
78623
78626

CVE ID: CVE-2015-3194
CVE-2015-3195
CVE-2015-3196

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