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AUSCERT External Security Bulletin Redistribution
ESB-2018.1377
Cisco Secure Access Control System Remote Code Execution Vulnerability
4 May 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Secure Access Control System
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0253
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-acs1
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Secure Access Control System Remote Code Execution Vulnerability
Critical
Advisory ID:
cisco-sa-20180502-acs1
First Published:
2018 May 2 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCve69037
CVE-2018-0253
CWE-20
CVSS Score:
Base 9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
CVE-2018-0253
CWE-20
Summary
o A vulnerability in the ACS Report component of Cisco Secure Access Control
System (ACS) could allow an unauthenticated, remote attacker to execute
arbitrary commands on an affected system. Commands executed by the attacker
are processed at the targeted user's privilege level.
The vulnerability is due to insufficient validation of the Action Message
Format (AMF) protocol. An attacker could exploit this vulnerability by
sending a crafted AMF message that contains malicious code to a targeted
user. A successful exploit could allow the attacker to execute arbitrary
commands on the ACS device.
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-20180502-acs1
Affected Products
o Vulnerable Products
This vulnerability affects all releases of Cisco Secure ACS prior to
Release 5.8 Patch 7. Administrators can use one of the following methods to
determine which Cisco Secure ACS release is running on a device.
Cisco Secure ACS CLI
The show version command can be issued from the Cisco Secure ACS CLI. The
following example shows the output of the show version command for a device
that is running Cisco Secure ACS 5.8.0.32 with Cumulative Patch 1
installed:
acs55/admin# show version
Cisco Application Deployment Engine OS Release: 2.2
ADE-OS Build Version: 2.2.2.013
ADE-OS System Architecture: x86_64
Copyright (c) 2005-2015 by Cisco Systems, Inc.
All rights reserved.
Hostname: acsx5
Version information of installed applications
---------------------------------------------
Cisco ACS VERSION INFORMATION
-----------------------------
Version : 5.8.0.32
Internal Build ID : B.442
Patches :
5-8-0-32-1
acs55/admin#
Cisco Secure ACS Web-Based Interface
To determine which release of Cisco Secure ACS is running on a device, log
in to the Cisco Secure ACS web-based interface and click the About link in
the top right corner of the screen.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that the following Cisco Secure ACS products are not
affected by this vulnerability:
- Cisco Secure Access Control Server Express
- Cisco Secure Access Control Server for Windows
- Cisco Secure Access Control Server Solution Engine
- Cisco Secure Access Control Server View
Details
o Cisco Secure ACS operates as a centralized RADIUS and TACACS+ server,
combining user authentication, user and administrator device access
control, and policy control into a centralized identity networking
solution. Cisco Secure ACS provides central management of access policies
for device administration and wireless, wired 802.1x, and remote VPN access
scenarios. The identity stores can be internal or external. An internal
identity store has user credential information stored in an internal
database. With an external identity store, Cisco Secure ACS will retrieve
information from an external database.
Note: The Cisco Secure ACS product offering is no longer being sold after
August 30, 2017. Customers may view the end-of-life notice.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o 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:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.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 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 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:
https://www.cisco.com/c/en/us/support/web/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
This vulnerability is fixed in Cisco Secure ACS Release 5.8.0.32 with
Cumulative Patch 7. The software can be downloaded from the Software Center
on Cisco.com by clicking Browse All and navigating to Security > Network
Visibility and Segmentation> Secure Access Control System > Secure Access
Control System 5.8.
Exploitation and Public Announcements
o 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
o Cisco would like to thank security researchers Mikhail Klyuchnikov and Yury
Aleynov from Positive Technologies for finding and reporting this
vulnerability.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-acs1
Revision History
+----------+-----------------------------+----------+---------+---------------+
| Version | Description | Section | Status | Date |
+----------+-----------------------------+----------+---------+---------------+
| 1.0 | Initial public release. | -- | Final | 2018-May-02 |
+----------+-----------------------------+----------+---------+---------------+
Legal Disclaimer
o 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.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
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