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AUSCERT External Security Bulletin Redistribution
Cisco Identity Services Engine Authentication Bypass Vulnerability
3 August 2017
AusCERT Security Bulletin Summary
Product: Cisco Identity Services Engine (ISE)
Publisher: Cisco Systems
Operating System: Cisco
VMware ESX Server
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
CVE Names: CVE-2017-6747
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Cisco Identity Services Engine Authentication Bypass Vulnerability
2017 August 2 16:00 GMT
No workarounds available
Cisco Bug IDs:
Base 8.1, Temporal 8.1
A vulnerability in the authentication module of Cisco Identity Services
Engine (ISE) could allow an unauthenticated, remote attacker to bypass
The vulnerability is due to improper handling of authentication requests
and policy assignment for externally authenticated users. An attacker
could exploit this vulnerability by authenticating with a valid external
user account that matches an internal username and incorrectly receiving
the authorization policy of the internal account. An exploit could allow
the attacker to have Super Admin privileges for the ISE Admin portal.
This vulnerability does not affect endpoints authenticating to the ISE.
Cisco has released software updates that address this
vulnerability. There are no workarounds that address this vulnerability.
This advisory is available at the following link:
The vulnerability affects the following Cisco Identity Services Engine
(ISE) products running Release 1.3, 1.4, 2.0.0, 2.0.1, or 2.1.0.
Release 2.2.x is not affected.
Cisco ISE Express
Cisco ISE Virtual Appliance
To determine which release of the software is currently running on a
device, administrators may use the show version command in the device
CLI or navigate to the top right corner and click Settings (gear icon)
> About Identity Service Engine in the Admin portal. The output of
the command in the CLI is similar to the following example:
ServiceEngine115/admin# show version
Cisco Application Deployment Engine OS Release: 2.3
ADE-OS Build Version: 184.108.40.206
ADE-OS System Architecture: x86_64
Copyright (c) 2005-2014 by Cisco Systems, Inc.
All rights reserved.
Version information of installed applications
Cisco Identity Services Engine
Version : 220.127.116.116
Build Date : Thu Oct 8 13:25:23 2015
Install Date : Tue Nov 17 21:02:22 2015
Cisco Identity Services Engine Patch
Version : 5
Install Date : Fri Jul 07 01:57:01 2017
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
Cisco has confirmed that this vulnerability does not affect Cisco ISE
Passive Identity Connector.
This vulnerability requires the configured ISE Admin portal to use an
external identity source for authentication. This extends to any external
identity source that can provide external groups supported by ISE.
There are no workarounds that address this vulnerability.
Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased
a license. By installing, downloading, accessing, or otherwise using
such software upgrades, customers agree to follow the terms of the
Cisco software license:
Additionally, customers may only download software for which they
have a valid license, procured from Cisco directly, or through a
Cisco authorized reseller or partner. In most cases this will be a
maintenance upgrade to software that was previously purchased. Free
security software updates do not entitle customers to a new software
license, additional software feature sets, or major revision upgrades.
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
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco
service contract and customers who make purchases through third-party
vendors but are unsuccessful in obtaining fixed software through their
point of sale should obtain upgrades by contacting the Cisco TAC:
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a
Customers should upgrade to an appropriate release as indicated in
the following table:
Cisco Identity Services Engine Release
First Fixed Release for This Vulnerability
1.3.0 Affected; migrate to 1.4
1.4.0 1.4.0 Patch 11
2.0.0 2.0.0 Patch 5
2.0.1 2.0.1 Patch 5 (see note)
2.1.0 2.1.0 Patch 2
2.2.x Not affected
Note: Software Release 2.0.1 Patch 5 is currently not posted. Until
this release is posted, please migrate to a fixed release.
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.
This vulnerability was found internally.
Version Description Section Status Date
1.0 Initial public release. -- Final 2017-August-02
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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