AIX OpenSSL Advisory : openssl_advisory12.asc (FREAK)

Medium Nessus Plugin ID 81406

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 :

- The BIGNUM squaring (BN_sqr) implementation does not properly calculate the square of a BIGNUM value. This allows remote attackers to defeat cryptographic protection mechanisms. (CVE-2014-3570)

- A NULL pointer dereference flaw exists in the dtls1_get_record() function when handling DTLS messages.
A remote attacker, using a specially crafted DTLS message, can cause a denial of service. (CVE-2014-3571)

- A flaw exists with ECDH handshakes when using an ECDSA certificate without a ServerKeyExchange message. This allows a remote attacker to trigger a loss of forward secrecy from the ciphersuite. (CVE-2014-3572)

- A flaw exists when accepting non-DER variations of certificate signature algorithms and signature encodings due to a lack of enforcement of matches between signed and unsigned portions. A remote attacker, by including crafted data within a certificate's unsigned portion, can bypass fingerprint-based certificate-blacklist protection mechanisms. (CVE-2014-8275)

- A security feature bypass vulnerability, known as FREAK (Factoring attack on RSA-EXPORT Keys), exists due to the support of weak EXPORT_RSA cipher suites with keys less than or equal to 512 bits. A man-in-the-middle attacker may be able to downgrade the SSL/TLS connection to use EXPORT_RSA cipher suites which can be factored in a short amount of time, allowing the attacker to intercept and decrypt the traffic. (CVE-2015-0204)

- A flaw exists when accepting DH certificates for client authentication without the CertificateVerify message.
This allows a remote attacker to authenticate to the service without a private key. (CVE-2015-0205)

- A memory leak occurs in dtls1_buffer_record when handling a saturation of DTLS records containing the same number sequence but for the next epoch. This allows a remote attacker to cause a denial of service.
(CVE-2015-0206)

Solution

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

See Also

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory12.asc

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

https://www.smacktls.com/#freak

Plugin Details

Severity: Medium

ID: 81406

File Name: aix_openssl_advisory12.nasl

Version: $Revision: 1.9 $

Type: local

Published: 2015/02/18

Modified: 2016/05/04

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 5

Temporal Score: 4.1

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

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

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: true

Exploit Ease: Exploits are available

Patch Publication Date: 2015/02/04

Vulnerability Publication Date: 2015/01/05

Reference Information

CVE: CVE-2014-3570, CVE-2014-3571, CVE-2014-3572, CVE-2014-8275, CVE-2015-0204, CVE-2015-0205, CVE-2015-0206

BID: 71935, 71936, 71937, 71939, 71940, 71941, 71942

OSVDB: 116790, 116791, 116792, 116793, 116794, 116795, 116796