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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.1475
       Cisco Adaptive Security Appliance XAUTH Bypass Vulnerability
                                9 June 2015

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

Product:           Cisco Adaptive Security Appliance
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Unauthorised Access -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-0760  

Original Bulletin: 
   http://tools.cisco.com/security/center/viewAlert.x?alertId=39157

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Vulnerability Alert

Cisco Adaptive Security Appliance XAUTH Bypass Vulnerability

	
Threat Type:		CWE-20: Input Validation
IntelliShield ID:	39157
Version:		2
First Published:	2015 June 02 21:27 GMT
Last Published:		2015 June 05 21:07 GMT
Port: 			Not available
CVE:			CVE-2015-0760
Urgency:		Unlikely Use	
Credibility:		Confirmed	
Severity:		Mild Damage	
CVSS Base:		4.0

Version Summary: IntelliShield has updated this alert to add researcher 
credit.

Description 

A vulnerability in Internet Key Exchange (IKE) version 1 (v1) code
of Cisco Adaptive Security Appliance (ASA) Software could allow an 
authenticated, remote attacker to bypass Extended Authentication (XAUTH) and 
successfully log in via IPsec remote VPN.

The vulnerability is due to improper implementation of the logic of the XAUTH
code. An attacker could exploit this vulnerability by sending crafted IKEv1 
packets to the affected system. An exploit could allow the attacker to bypass
authentication and access the network via remote VPN.

Cisco has confirmed the vulnerability and released software updates.

Warning Indicators The following Cisco ASA Software trains are affected:

    7.x 8.0 8.1 8.2 prior to 8.2.2.13

[Updated!] IntelliShield Analysis

To exploit this vulnerability, an attacker must authenticate to the targeted 
device. This access requirement decreases the likelihood of a successful 
exploit.

This vulnerability affects only Cisco ASA Software configured for IKEv1 IPsec
remote access and IKEv1 IPsec LAN-to-LAN. In addition, an attacker would need
to know the tunnel group preshared key or have a valid certificate.

Cisco would like to thank Daniel Turner of Trustwave for reporting this 
vulnerability.

Vendor Announcements

Cisco has released bug ID CSCus47259 for registered users, which contains 
additional details and an up-to-date list of affected product versions.

Impact

An authenticated, remote attacker could exploit this vulnerability to bypass 
authentication and gain network access to an environment an affected device is
protecting. A successful exploit could be used to conduct further attacks.

Technical Information

The vulnerability is due to improper implementation of the logic of the XAUTH
code in the affected software.

An attacker could exploit this vulnerability by sending crafted IKEv1 packets
to the affected system. An exploit could allow the attacker to bypass 
authentication and access the network via remote VPN.

Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators are advised to allow only privileged users to access 
administration or management systems.

Administrators are advised to monitor affected systems.

Patches/Software

Cisco customers with active contracts can obtain updates through the Software
Center at the following link: Cisco. Cisco customers without contracts can 
obtain upgrades by contacting the Cisco Technical Assistance Center at 
1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.

Alert History

Version 1, June 2, 2015, 5:27 PM: Cisco Adaptive Security Appliance contains a
vulnerability that could allow an authenticated, remote attacker to bypass 
security restrictions and gain unauthorized network access. Updates are 
available.

Product Sets

The security vulnerability applies to the following combinations of products.

Primary Products:

Cisco Cisco Adaptive Security Appliance (ASA) Software 7.0 .1.4, .1, .2, .3, 
.4, .4.2, .5, .5.12, .6, .6.4, .6.8, .6.18, .6.22, .6.26, .6.29, .6.32, .7, 
.7.1, .7.4, .7.9, .7.12, .8, .8.2, .8.8, .8.12, .8.13 | 7.1 .2, .2.16, .2.20,
.2.24, .2.28, .2.38, .2.42, .2.46, .2.49, .2.53, .2.61, .2.64, .2.72, .2.81 |
7.2 .1, .1.9, .1.13, .1.19, .1.24, .2, .2.6, .2.10, .2.14, .2.18, .2.19, 
.2.22, .2.34, .3, .3.1, .3.12, .3.16, .4, .4.6, .4.9, .4.18, .4.25, .4.27, 
.4.30, .4.33, .5, .5.2, .5.4, .5.7, .5.8, .5.10, .5.12 | 8.0 .1.2, .2, .2.11,
.2.15, .3, .3.6, .3.12, .3.19, .4, .4.3, .4.9, .4.16, .4.23, .4.25, .4.28, 
.4.31, .4.32, .4.33, .5, .5.20, .5.23, .5.25, .5.27, .5.28, .5.31 | 8.1 .1, 
.1.6, .2, .2.13, .2.15, .2.16, .2.19, .2.23, .2.24, .2.49, .2.50, .2.55, .2.56
| 8.2 .0.45, .1, .1.11, .2, .2.9, .2.10, .2.12

Associated Products: N/A

Alerts and bulletins on the Cisco Security Intelligence Operations Portal are
highlighted by analysts in the Cisco Threat Operations Center and represent a
subset of the comprehensive content that is available through Cisco Security 
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LEGAL DISCLAIMER

The urgency and severity ratings of this alert are not tailored to individual
users; users may value alerts differently based upon their network 
configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED 
THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF 
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED 
THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION
IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE
TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES 
THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.

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