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AUSCERT External Security Bulletin Redistribution
Cisco Identity Services Engine Active Directory Integration
Component Denial of Service Vulnerability
20 December 2016
AusCERT Security Bulletin Summary
Product: Cisco Identity Services Engine
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2016-9198
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Cisco Security Advisory
Cisco Identity Services Engine Active Directory Integration Component Denial
of Service Vulnerability
Advisory ID: cisco-sa-20161207-ise
First Published: 2016 December 7 16:00 GMT
Version 1.0: Final
Cisco Bug IDs: CSCuw15041
CVSS Score: Base 5.0, Temporal 4.1
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:
Vulnerable Products Cisco ISE is affected. For information about affected
software releases, consult the Cisco bug ID(s) at the top of this advisory.
Products Confirmed Not Vulnerable No other Cisco products are currently known
to be affected by this vulnerability.
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
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
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.
Exploitation and Public Announcements
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.
Version Description Section Status Date
1.0 Initial public release. Ã¢Â€Â” Final 2016-December-07
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.
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