Cisco AnyConnect Secure Mobility Client < 3.1.13015.0 / 4.2.x < 4.2.1035.0 Multiple OpenSSL Vulnerabilities

Medium Nessus Plugin ID 88100

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VPR Score: 3.6

Synopsis

The remote host is affected by multiple vulnerabilities.

Description

The Cisco AnyConnect Secure Mobility Client installed on the remote 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

Plugin Details

Severity: Medium

ID: 88100

File Name: cisco_anyconnect_CSCux41420.nasl

Version: 1.8

Type: local

Agent: windows

Family: Windows

Published: 2016/01/22

Updated: 2018/07/06

Dependencies: 54953

Risk Information

Risk Factor: Medium

VPR Score: 3.6

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Temporal Vector: CVSS2#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, SMB/Registry/Enumerated

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/12/04

Vulnerability Publication Date: 2015/08/11

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