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AUSCERT External Security Bulletin Redistribution
ESB-2016.0488
Cisco ACE 4710 Application Control Engine Command Injection Vulnerability
25 February 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco ACE 4710
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Administrator Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2016-1297
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160224-ace
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Cisco Security Advisory
Cisco ACE 4710 Application Control Engine Command Injection Vulnerability
High
Advisory ID:
cisco-sa-20160224-ace
Published:
2016 February 24 16:00 GMT
Version 1.0:
Final
CVSS Score:
Base - 8.5
Workarounds:
Yes
Cisco Bug IDs:
CSCul84801
CVE-2016-1297
CWE-78
Summary
A vulnerability in the Device Manager GUI of the Cisco ACE 4710 Application
Control Engine could allow an authenticated, remote attacker to execute any
command-line interface (CLI) command on the ACE with admin user privileges.
The vulnerability is due to insufficient validation of user-supplied input.
An attacker could exploit this vulnerability by crafting a malicious HTTP
POST request with injected CLI commands inside the value of a POST parameter
value. An exploit could allow the attacker to bypass the role-based access
control (RBAC) restrictions enforced by the Cisco ACE Device Manager GUI.
Cisco has released software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160224-ace
Affected Products
Vulnerable Products
Cisco ACE 4710 Application Control Engine running A5 software releases up
to A5(3.0) is vulnerable when configured to allow access to the Device
Manager GUI. Inspect the relevant sections of the configuration to
determine whether Device Manager GUI access is configured on the ACE, as
shown in the following example:
ace-4710-1/Admin# show running-config
Generating configuration....
[...]
class-map type management match-any my-mgmt-class
202 match protocol icmp any
203 match protocol https any
204 match protocol ssh any
[...]
policy-map type management first-match my-mgmt-pol
class my-mgmt-class
permit
[...]
interface vlan 2
[...]
service-policy input my-mgmt-pol
service-policy input other-traffic
no shutdown
To determine which software version is running on the appliance,
administrators can issue the show version command. The following is an
example of the output of this command issued on a system running software
version A5(3.2):
ace-4710-1/Admin# show version
Cisco Application Control Software (ACSW)
TAC support: http://www.cisco.com/tac
Copyright (c) 1985-2015 by Cisco Systems, Inc. All rights reserved.
The copyrights to certain works contained herein are owned by
other third parties and are used and distributed under license.
Some parts of this software are covered under the GNU Public
License. A copy of the license is available at
http://www.gnu.org/licenses/gpl.html.
Software
loader: Version 0.95.1
system: Version A5(3.2) [build 3.0(0)A5(3.2) adbuild
_17:03:27-2015/04/02_/auto/adbure_nightly4/renumber
/rel_a5_3_2_throttle/REL_3_0_0_A5_3_2]
system image file: (hd0,1)/c4710ace-t1k9-mz.A5_3_2.bin
Device Manager version 5.3.2 (0) 20150331:0838
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 the following
Cisco products:
Cisco ACE Application Control Engine Module
Cisco Application Networking Manager (ANM)
Workarounds
Administrators can disable management access to the Cisco ACE 4710
Application Control Engine Device Manager GUI until the appropriate fix
can be applied. The following example shows how to disable access, assuming
the device is configured with the following management class map:
class-map type management match-any my-mgmt-class
202 match protocol icmp any
203 match protocol https any
204 match protocol ssh any
ace-4710-1/Admin# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
ace-4710-1/Admin(config)# class-map type management match-any my-mgmt-class
ace-4710-1/Admin(config-cmap-mgmt)# no match protocol https any
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 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 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 Technical Assistance Center
(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 Versions
The vulnerability described in this advisory has been fixed in software
versions: A5(3.3), A5(3.2), A5(3.1b), A5(3.1a), and A5(3.1).
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 Jan Kadijk of Warpnet BV.
URL
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160224-ace
Revision History
Version Description Section Status Date
1.0 Initial public release. — Final 2016-February-24
Legal Disclaimer
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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