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AUSCERT External Security Bulletin Redistribution
ESB-2013.1731
Cisco ASA Malformed DNS Reply Denial of Service Vulnerability
4 December 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-2013-6696
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6696
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Cisco Security Notice
Cisco ASA Malformed DNS Reply Denial of Service Vulnerability
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6696
CVE ID: CVE-2013-6696
Release Date: 2013 December 2 14:57 UTC (GMT)
Last Updated: 2013 December 2 21:23 UTC (GMT)
Related Documents:
Summary
A vulnerability in the DNS code of Cisco ASA Software could allow an
unauthenticated, remote attacker to cause the reload of an affected system.
The vulnerability is due to improper handling of DNS error cases when the
Cisco ASA Software receives a DNS reply packet under a particular system
configuration. An attacker could exploit this vulnerability by either owning a
DNS server or ensuring that the reply to a DNS request from an affected system
is malformed. An exploit could allow the attacker to cause the reload of the
affected system.
Affected Products
Product More Information CVSS
Cisco Adaptive Security Appliance
(ASA) Software CSCuj28861 5.4/4.5
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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