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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
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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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