Operating System:

[Cisco]

Published:

24 February 2015

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.0432
         Cisco Intrusion Prevention System Key Regeneration HTTPS
                      Denial of Service Vulnerability
                             24 February 2015

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

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

Product:           Cisco Intrusion Prevention System
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-0631  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0631

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Cisco Intrusion Prevention System Key Regeneration HTTPS Denial of Service 
Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0631

CVE ID: CVE-2015-0631

Release Date: 2015 February 20 17:08 UTC (GMT)

Last Updated: 2015 February 20 17:08 UTC (GMT)

Summary

A vulnerability in the SSL/TLS subsystem used by the web management interface
of Cisco Intrusion Prevention System (IPS) software could allow an 
unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to a potential race condition while regenerating the
affected device's cryptographic certificate and keys during an upgrade to 
image 7.2 or later from an image prior to 7.2. An attacker could exploit this
vulnerability by negotiating a number of HTTPS connections with the management
interface while key regeneration is in process. A successful exploit could 
allow the attacker to create a DoS condition. The condition will persist until
the device has been restarted.

The vulnerability can be triggered only by SSL/TLS traffic directed to the TCP
port and IP address of the management interface associated with the web 
server. The default TCP port is 443. Packets transiting an affected device 
through the sensing interfaces cannot be used to trigger this vulnerability.

Affected Products

Product 				More Information 	CVSS

Intrusion Prevention System (IPS) 	CSCui25688 		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/web/about/security/psirt/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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