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AUSCERT External Security Bulletin Redistribution
Cisco Identity Services Engine Active Directory Integration
Component Remote Denial of Service Vulnerability
18 May 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-2016-1402
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Cisco Security Advisory
Cisco Identity Services Engine Active Directory Integration Component
Remote Denial of Service Vulnerability
2016 May 17 00:00 GMT
Base - 5.0
Cisco Bug IDs:
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:
Cisco Identity Services Engine (ISE) Software versions prior to
184.108.40.2069 patch 7 are affected.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
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  Clear Active Directory Trusts Cache and restart/apply
Active Directory setting
Reboot the PSN
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
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. Final 2016-May-17
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.
A standalone copy or paraphrase of the text of this document that omits
the distribution URL is an uncontrolled copy and may lack important
information or contain factual errors. The information in this document
is intended for end users of Cisco products.
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