Cisco Security Advisory
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AV:N/AC:H/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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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.
Cisco has confirmed the vulnerability in a security notice and released software updates.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Customers are advised to consult Cisco bug ID CSCui25688 for the most complete list of affected product versions.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to monitor affected systems.
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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2015-Feb-20
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