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AUSCERT External Security Bulletin Redistribution
ESB-2013.1506
Cisco ASA VPN Denial of Service Vulnerability
23 October 2013
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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
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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.
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