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             AUSCERT External Security Bulletin Redistribution

     Cisco Identity Services Engine Privilege Escalation Vulnerability
                              2 November 2017


        AusCERT Security Bulletin Summary

Product:           Cisco Identity Services Engine (ISE)
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Increased Privileges            -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12261  

Original Bulletin: 

Revision History:  November 2 2017: Added the Original Bulletin link
                   November 2 2017: Initial Release

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Cisco Identity Services Engine Privilege Escalation Vulnerability


Advisory ID:

First Published:
2017 November 1 16:00 GMT

Version 1.0:

No workarounds available Cisco Bug IDs:

CVSS Score:
Base 7.8



A vulnerability in the restricted shell of the Cisco Identity Services Engine
(ISE) that is accessible via SSH could allow an authenticated, local attacker
to run arbitrary CLI commands with elevated privileges.

The vulnerability is due to incomplete input validation of the user input for
CLI commands issued at the restricted shell. An attacker could exploit this 
vulnerability by authenticating to the targeted device and executing commands
that could lead to elevated privileges. An attacker would need valid user 
credentials to the device to exploit this vulnerability.

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: 

Affected Products

Vulnerable Products

The vulnerability affects the following Cisco Identity Services Engine (ISE) 
products running Release 1.4, 2.0, 2.0.1, 2.1.0:

Cisco ISE
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:
ADE-OS System Architecture: x86_64
Copyright (c) 2005-2014 by Cisco Systems, Inc.
All rights reserved.
Hostname: ServiceEngine115
Version information of installed applications
- ---------------------------------------------

Cisco Identity Services Engine

- ---------------------------------------------
Version :
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.


There are no workarounds that address this vulnerability.

Fixed Software

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 

In all cases, customers should ensure that the devices to upgrade 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.

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 free upgrade.

Fixed Releases

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                                             Affected; migrate to 1.4 patch 12
1.4                                             1.4 patch 12 (see note)
2.0                                             2.0 patch 6 (see note)
2.0.1                                           Affected: migrate to 2.1 patch 5
2.1.0                                           2.1 patch 5
2.2.0                                           2.2.0 patch 2
2.3.0                                           Not affected

Note: Software Release 1.4 patch 12 and 2.0 patch 6 are currently not posted.
Until these releases are 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 reported to Cisco by an anonymous security researcher.



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