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 Services Engine (ISE) could allow an unauthenticated, remote attacker to perform a denial of service (DoS) 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 all subsequent authentication requests for the same Active Directory domain to fail.
There are workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161207-ise
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The following workaround steps are available:
- Access the CLI of the affected ISE Policy Services Node (PSN)
- Enter application configure ise
- Choose option 5: Clear Active Directory Trusts Cache and restart/apply Active Directory settings
- Reboot the PSN
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For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, 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-December-07
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