Cisco AnyConnect Secure Mobility Client < 3.1(7021) / <= 4.0(48) Multiple Vulnerabilities (FREAK)

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


Synopsis :

The remote host is affected by multiple vulnerabilities.

Description :

The remote host has a version of Cisco AnyConnect Secure Mobility
Client installed that is prior to 3.1.7021.0, or else it is a version
equal or prior to 4.0.0048.0. It is, therefore, affected by multiple
vulnerabilities in the OpenSSL library :

- 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 with
dtls1_get_record 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 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 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)

See also :

http://www.nessus.org/u?bd646a4f

Solution :

Upgrade to Cisco AnyConnect Secure Mobility Client 3.1(7021) or
later, or refer to the vendor.

Risk factor :

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

Family: Windows

Nessus Plugin ID: 82270 ()

Bugtraq ID: 71935
71936
71937
71939
71940

CVE ID: CVE-2014-3570
CVE-2014-3571
CVE-2014-8275
CVE-2015-0204
CVE-2015-0206

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