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

medium Nessus Plugin ID 88101
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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)

Solution

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

See Also

http://www.nessus.org/u?4099a8d6

https://tools.cisco.com/bugsearch/bug/CSCux41420

https://www.openssl.org/news/secadv/20151203.txt

Plugin Details

Severity: Medium

ID: 88101

File Name: macosx_cisco_anyconnect_CSCux41420.nasl

Version: 1.8

Type: local

Agent: macosx

Published: 1/22/2016

Updated: 7/14/2018

Dependencies: macosx_cisco_anyconnect_installed.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:anyconnect_secure_mobility_client

Required KB Items: installed_sw/Cisco AnyConnect Secure Mobility Client, Host/MacOSX/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 12/4/2015

Vulnerability Publication Date: 8/11/2015

Reference Information

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

BID: 78622, 78623, 78626

CISCO-SA: cisco-sa-20151204-openssl

IAVA: 2016-A-0030

CISCO-BUG-ID: CSCux41420