AIX OpenSSL Advisory : openssl_advisory12.asc (FREAK)

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 :

- 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.

See also :

Solution :

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

Risk factor :

Medium / CVSS Base Score : 5.0
CVSS Temporal Score : 4.1
Public Exploit Available : true

Family: AIX Local Security Checks

Nessus Plugin ID: 81406 ()

Bugtraq ID: 71935

CVE ID: CVE-2014-3570

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