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AUSCERT External Security Bulletin Redistribution
ESB-2017.2785.2
Cisco Identity Services Engine Privilege Escalation Vulnerability
2 November 2017
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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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-ise
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
High
Advisory ID:
cisco-sa-20171101-ise
First Published:
2017 November 1 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available Cisco Bug IDs:
CSCve74916
CVSS Score:
Base 7.8
CVE-2017-12261
CWE-264
Summary
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-ise
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: 2.3.0.187
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 : 2.0.0.306
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
vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco ISE Passive
Identity Connector.
Workarounds
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:
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html
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 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:
http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
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.
Source
This vulnerability was reported to Cisco by an anonymous security researcher.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-ise
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