AIX OpenSSL Advisory : openssl_advisory13.asc

This script is Copyright (C) 2015-2016 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
the following vulnerabilities :

- A use-after-free condition exists in the
d2i_ECPrivateKey() function due to improper processing
of malformed EC private key files during import. A
remote attacker can exploit this to dereference or free
already freed memory, resulting in a denial of service
or other unspecified impact. (CVE-2015-0209)

- An invalid read flaw exists in the ASN1_TYPE_cmp()
function due to improperly performed boolean-type
comparisons. A remote attacker can exploit this, via a
crafted X.509 certificate to an endpoint that uses the
certificate-verification feature, to cause an invalid
read operation, resulting in a denial of service.
(CVE-2015-0286)

- A flaw exists in the ASN1_item_ex_d2i() function due to
a failure to reinitialize 'CHOICE' and 'ADB' data
structures when reusing a structure in ASN.1 parsing.
This allows a remote attacker to cause an invalid write
operation and memory corruption, resulting in a denial
of service. (CVE-2015-0287)

- A NULL pointer dereference flaw exists in the
X509_to_X509_REQ() function due to improper processing
of certificate keys. This allows a remote attacker, via
a crafted X.509 certificate, to cause a denial of
service. (CVE-2015-0288)

- A NULL pointer dereference flaw exists in the PKCS#7
parsing code due to incorrect handling of missing outer
ContentInfo. This allows a remote attacker, using an
application that processes arbitrary PKCS#7 data and
providing malformed data with ASN.1 encoding, to cause
a denial of service. (CVE-2015-0289)

- An integer underflow condition exists in the
EVP_DecodeUpdate() function due to improper validation
of base64 encoded input when decoding. This allows a
remote attacker, using maliciously crafted base64 data,
to cause a segmentation fault or memory corruption,
resulting in a denial of service or possibly the
execution of arbitrary code. (CVE-2015-0292)

- A flaw exists in servers that both support SSLv2 and
enable export cipher suites due to improper
implementation of SSLv2. A remote attacker can exploit
this, via a crafted CLIENT-MASTER-KEY message, to cause
a denial of service. (CVE-2015-0293)

See also :

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory13.asc
https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp

Solution :

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

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

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.5
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: AIX Local Security Checks

Nessus Plugin ID: 82900 ()

Bugtraq ID: 73225
73227
73228
73231
73232
73237
73239

CVE ID: CVE-2015-0209
CVE-2015-0286
CVE-2015-0287
CVE-2015-0288
CVE-2015-0289
CVE-2015-0292
CVE-2015-0293

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