Cisco Adaptive Security Appliance (ASA) Software: Access Privileged Data -- Existing Account

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.0387
 Cisco ASA Challenge-Response Tunnel Group Selection Bypass Vulnerability
                             18 February 2015

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Adaptive Security Appliance (ASA) Software
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-8023  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-8023

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Cisco Security Notice

Cisco ASA Challenge-Response Tunnel Group Selection Bypass Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-8023

CVE ID: CVE-2014-8023

Release Date: 2015 February 16 18:22  UTC (GMT) 

Last Updated: 2015 February 16 19:55  UTC (GMT) 

Summary

A vulnerability in the authentication code of Cisco ASA Software could allow 
an authenticated, remote attacker to access resources of a VPN tunnel group.

The vulnerability is due to improper implementation of the tunnel group 
selection when a user authenticates to the remote access VPN via the 
challenge-response mechanism. This vulnerability may affect Cisco ASA 
configured to authenticate remote access VPN users via LDAP, RADIUS, TACACS+,
and RSA if a challenge-response is needed for authentication. Cisco ASA 
Software configured for Clientless or AnyConnect SSL VPN is affected by this 
vulnerability.

An attacker could exploit this vulnerability by crafting a response to the 
Cisco ASA with a different tunnel group parameter. A successful exploit could
allow the attacker to bypass the tunnel group restriction and authenticate to 
a different tunnel group than the one selected during the authentication 
phase. This could result in accessing a different set of resources.

Affected Products

Product				More Information	CVSS

Cisco Adaptive Security		CSCtz48533		4.0/3.3
Appliance (ASA) Software

WhatIs a Cisco Security Notice?

The Cisco Product Security Incident Response Team (PSIRT) publishes Cisco 
Security Notices to inform customers of low- to mid-level severity security 
issues involving Cisco products.

Customers who wish to upgrade to a software version that includes fixes for 
these issues should contact their normal support channels. Free software 
updates will not be provided for issues that are disclosed through a Cisco 
Security Notice.

For additional information about Cisco PSIRT publications, see the Cisco 
Security Vulnerability Policy at 
http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html

Customers Using Third-Party Support Organizations

Customers may have Cisco products that are provided or maintained through 
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as Cisco Partners, authorized resellers, or service providers. For these
products, customers should consult their service providers or support 
organizations to ensure that any applied workaround or fix is the most 
appropriate in the intended network before it is deployed.

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