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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0082
 Cisco Adaptive Security Appliance Non-DCERPC Traffic Bypass Vulnerability
                              13 January 2016

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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-2015-6423  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160111-asa

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Cisco Security Advisory

Cisco Adaptive Security Appliance Non-DCERPC Traffic Bypass Vulnerability

Medium

Advisory ID:

cisco-sa-20160111-asa

Published:

2016 January 11 00:00 GMT

Version 1.0:

Final

CVSS Score:

Base - 3.5

Workarounds:

No workarounds available

Cisco Bug IDs:

CSCuu67782

CVE-2015-6423

CWE-20

Summary

A vulnerability in the Distributed Computing Environment/Remote Procedure 
Calls (DCERPC) Inspection feature of the Cisco Adaptive Security Appliance 
(ASA) could allow an authenticated, remote attacker to send traffic that is 
not DCERPC between hosts configured only for DCERPC inspection. The DCERPC 
traffic should be allowed only on TCP port 135.

The vulnerability is due to an internal access control list (ACL), which is 
used to allow DCERPC traffic but is incorrectly programmed to allow all 
traffic types and not restricted to DCERPC TCP port 135. An attacker could 
exploit this vulnerability by sending non-DCERPC traffic between hosts 
configured for DCERPC inspection that would normally be dropped. An exploit 
could allow the attacker to access hosts that should normally be restricted 
through the ASA.

Cisco has released software updates that address this vulnerability. 
Workarounds that mitigate this vulnerability are not available.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160111-asa

Affected Products

Vulnerable Products

Cisco ASA Software releases 9.4.1 up to 9.5.1 are vulnerable.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this 
vulnerability.

Workarounds

There are no workarounds that address this vulnerability.

Fixed Software

When considering software upgrades, customers are advised to consult the Cisco
Security Advisories and Responses archive at http://www.cisco.com/go/psirt and
review subsequent advisories to determine exposure and a complete upgrade 
solution.

In all cases, customers should ensure that the devices to upgrade contain 
sufficient memory and confirm that current hardware and software 
configurations will continue to be supported properly by the new release. If 
the information is not clear, customers are advised to contact the Cisco 
Technical Assistance Center (TAC) or their contracted maintenance providers.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any
public announcements or malicious use of the vulnerability that is described 
in this advisory.

URL

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160111-asa

Revision History

Version	Description 		Section	Status	Date

1.0 	Initial public release 	-	Final	2016-January-11

Legal Disclaimer

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF 
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO 
CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A standalone copy or paraphrase of the text of this document that omits the 
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end 
users of Cisco products.

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