Cisco Security Advisory
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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 the Active Directory integration component of Cisco Identity Service Engine (ISE) could allow an unauthenticated, remote attacker to perform a denial of service attack.
The vulnerability is due to improper handling of password authentication protocol (PAP) authentication requests when ISE is configured with an authorization policy based on Active Directory group membership. An attacker could exploit this vulnerability by crafting a special but formally correct PAP authentication request that will trigger the issue. An exploit could allow the attacker to cause the failures of all subsequent authentication requests for the same Active Directory domain.
Cisco has released software updates that address this vulnerability. Workarounds that address this vulnerability are available.
This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160517-ise
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The following workaround is available:
- Access the command-line interface (CLI) of the affected ISE Policy Services Node (PSN)
- Enter the following command into the CLI:
application configure ise
- Use option [5] Clear Active Directory Trusts Cache and restart/apply Active Directory setting
- Reboot the PSN
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When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
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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 public release. — Final 2016-May-17
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