Operating System:

[Cisco]

Published:

23 October 2013

Protect yourself against future threats.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.1506
               Cisco ASA VPN Denial of Service Vulnerability
                              23 October 2013

===========================================================================

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

Product:           Cisco Adaptive Security Appliance
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-5544  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5544

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Security Notice

Cisco ASA VPN Denial of Service Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5544

CVE ID: CVE-2013-5544

Release Date: 2013 October 21 21:39  UTC (GMT)

Last Updated: 2013 October 22 15:18  UTC (GMT)

Related Documents:    

Summary

A vulnerability in the VPN authentication code that handles parsing of the 
username from the certificate on the Cisco ASA firewall could allow an 
unauthenticated, remote attacker to cause a reload of the affected device.

The vulnerability is due to parallel processing of a large number of Internet 
Key Exchange (IKE) requests for which username-from-cert is configured. An 
attacker could exploit this vulnerability by sending a large number of IKE 
requests when the affected device is configured with the username-from-cert 
command. An exploit could allow the attacker to cause a reload of the affected
device, leading to a denial of service (DoS) condition.

Affected Products

Product				More Information	CVSS
Cisco Adaptive Security 	CSCua91108		5.4/4.5
Appliance (ASA) Software

What Is 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/en/US/products/products_security_vulnerability_policy.html

Customers Using Third-Party Support Organizations

Customers may have Cisco products that are provided or maintained through 
prior or existing agreements with third-party support organizations, such 
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.

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 stand-alone 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.

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=ycCY
-----END PGP SIGNATURE-----