Juniper Junos Multiple OpenSSL Vulnerabilities (JSA10679) (FREAK)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote device is missing a vendor-supplied security patch.

Description :

According to its self-reported version number, the remote Juniper
Junos device is affected by the following vulnerabilities related to
OpenSSL :

- A NULL pointer dereference flaw exists when the SSLv3
option isn't enabled and an SSLv3 ClientHello is
received. This allows a remote attacker, using an
unexpected handshake, to crash the daemon, resulting in
a denial of service. (CVE-2014-3569)

- 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 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)

Note that these issues only affects devices with J-Web or the SSL
service for JUNOScript enabled.

See also :

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10679
https://www.openssl.org/news/secadv/20150108.txt
https://www.smacktls.com/#freak

Solution :

Apply the relevant Junos software release or workaround referenced in
Juniper advisory JSA10679.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N)
CVSS Temporal Score : 4.3
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Junos Local Security Checks

Nessus Plugin ID: 82912 ()

Bugtraq ID: 71934
71935
71936
71939
71941
71942

CVE ID: CVE-2014-3569
CVE-2014-3570
CVE-2014-3572
CVE-2014-8275
CVE-2015-0204
CVE-2015-0205

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