Mac OS X : Cisco AnyConnect Secure Mobility Client < 3.1.13015.0 / 4.2.x < 4.2.1035.0 Multiple OpenSSL Vulnerabilities

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote host is affected by multiple vulnerabilities.

Description :

The Cisco AnyConnect Secure Mobility Client installed on the remote
Mac OS X host is a version prior to 3.1.13015.0 or 4.2.x prior to
4.2.1035.0. It is, therefore, affected by multiple vulnerabilities in
the bundled version of OpenSSL :

- A carry propagating flaw exists in the x86_64 Montgomery
squaring implementation that may cause the BN_mod_exp()
function to produce incorrect results. An attacker can
exploit this to obtain sensitive information regarding
private keys. (CVE-2015-3193)

- A NULL pointer dereference flaw exists in file
rsa_ameth.c when handling ASN.1 signatures that use the
RSA PSS algorithm but are missing a mask generation
function parameter. A remote attacker can exploit this
to cause the signature verification routine to crash,
leading to a denial of service. (CVE-2015-3194)

- A flaw exists in the ASN1_TFLG_COMBINE implementation in
file tasn_dec.c related to handling malformed
X509_ATTRIBUTE structures. A remote attacker can exploit
this to cause a memory leak by triggering a decoding
failure in a PKCS#7 or CMS application, resulting in a
denial of service. (CVE-2015-3195)

- A race condition exists in s3_clnt.c that is triggered
when PSK identity hints are incorrectly updated in the
parent SSL_CTX structure when they are received by a
multi-threaded client. A remote attacker can exploit
this, via a crafted ServerKeyExchange message, to cause
a double-free memory error, resulting in a denial of
service. (CVE-2015-3196)

- A flaw exists in the ssl3_get_key_exchange() function
in file s3_clnt.c when handling a ServerKeyExchange
message for an anonymous DH ciphersuite with the value
of 'p' set to 0. A attacker can exploit this, by causing
a segmentation fault, to crash an application linked
against the library, resulting in a denial of service.
(CVE-2015-1794)

See also :

http://www.nessus.org/u?4099a8d6
https://tools.cisco.com/bugsearch/bug/CSCux41420
https://www.openssl.org/news/secadv/20151203.txt

Solution :

Upgrade to Cisco AnyConnect Secure Mobility Client version 3.1.13015.0
/ 4.2.1035.0 or later.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N)
CVSS Temporal Score : 3.7
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: MacOS X Local Security Checks

Nessus Plugin ID: 88101 ()

Bugtraq ID: 78622
78623
78626

CVE ID: CVE-2015-3193
CVE-2015-3194
CVE-2015-3195
CVE-2015-3196
CVE-2015-1794

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