Cisco Security Advisory
Cisco Identity Services Engine Guest User Account Exhaustion Vulnerability
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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A vulnerability in Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to exhaust guest user account resources.
The vulnerability is due to a guest account creation page that allows unlimited guest accounts to be created upon refreshing the page. An attacker could exploit this vulnerability by creating a new guest account then repeatedly refreshing the page until the maximum number of guest accounts for the system is reached. An exploit could allow the attacker to deny creation of other guest accounts.
Cisco confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker would likely need access to trusted, internal networks and access to the guest account creation page from the targeted device to create new guest accounts. These access requirements limit the likelihood of a successful exploit.
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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Cisco released a security notice at the following link: CVE-2013-5521
Customers are advised to consult Cisco bug ID CSCue94287 or the most complete list of affected product versions.Vulnerable Products
At the time this alert was first published, Cisco ISE Software Releases 1.1.4 patch 7 and prior were vulnerable. Later releases of Cisco ISE Software may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to monitor affected systems.
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 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 2013-Oct-25
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