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Cisco Security Advisory

Multiple Vulnerabilities in Cisco Secure Access Control System

Advisory ID: cisco-sa-20140115-csacs

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140115-csacs

Revision 1.0

For Public Release 2014 January 15 16:00  UTC (GMT)

Related Resources:

View related Applied Mitigation Bulletin

Summary

Cisco Secure Access Control System (ACS) is affected by the following vulnerabilities:

  • Cisco Secure ACS RMI Privilege Escalation Vulernability
  • Cisco Secure ACS RMI Unauthenticated User Access Vulnerability
  • Cisco Secure ACS Operating System Command Injection Vulnerability

Cisco Secure ACS uses the Remote Method Invocation (RMI) interface for internode communication using TCP ports 2020 and 2030.

These vulnerabilities are independent of each other; a release that is affected by one of the vulnerabilities may not be affected by the other.

Cisco has released free software updates that address these vulnerabilities. This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140115-csacs

Network-based mitigations for the RMI-based vulnerabilities are outlined in the Cisco Applied Mitigation Bulletin: Identifying and Mitigating the Multiple Vulnerabilities in Cisco Secure Access Control System
http://tools.cisco.com/security/center/viewAMBAlert.x?alertId=32120

Affected Products


Vulnerable Products

All releases of Cisco Secure ACS prior to release 5.5 are affected by the RMI-based vulnerabilities in this advisory.

All releases of Cisco Secure ACS prior to ACS 5.4 patch 3 are affected by the OS command injection vulnerability in this advisory.

Use the following methods to determine the version of Cisco Secure ACS that is running:

  • From the Cisco Secure ACS command-line interface (CLI), issue the show version command, as shown in the following example:
    acs51a/admin# show version
    
    Cisco Application Deployment Engine OS Release: 1.2
    ADE-OS Build Version: 1.2.0.152
    ADE-OS System Architecture: i386
    
    Copyright (c) 2005-2009 by Cisco Systems, Inc.
    All rights reserved.
    Hostname: acs51a
    
    
    Version information of installed applications
    ---------------------------------------------
    
     
    Cisco ACS VERSION INFORMATION
    -----------------------------
    Version : 5.1.0.44.6
    Internal Build ID : B.2347
    Patches : 
    5-1-0-44-3
    5-1-0-44-6
    
    acs51a/admin#
  • On the main login page of the Cisco Secure ACS web-based interface, the version information is displayed on the left side of the screen.
  • From the Cisco Secure ACS web-based interface, log in and click the About link at the top right corner of the screen.

Cisco Secure ACS version 5.1 will identify itself as version 5.1.0.44, Cisco Secure ACS version 5.2 will identify itself as version 5.2.0.26 and Cisco Secure ACS version 5.3 will identify itself as version 5.3.0.40. The presence of an additional digit after the version number indicates the highest patch level installed. For example, a version number of 5.1.0.44.3 indicates Cisco Secure ACS version 5.1 with up to patch 3 installed. The absence of any additional digit after the version string indicates a Cisco Secure ACS version with no patches installed. The example above shows a Cisco Secure ACS running version 5.1 Patch 6.

Products Confirmed Not Vulnerable

The following Cisco Secure Access Control Server products are not affected by this vulnerabilities:

  • Cisco Secure Access Control Server for Windows
  • Cisco Secure Access Control Server Express
  • Cisco Secure Access Control Server View
  • Cisco Secure Access Control Server Solution Engine
No other Cisco products are currently known to be affected by these vulnerabilities.

Details

A core component of the Cisco TrustSec solution, Cisco Secure ACS is a highly sophisticated policy platform providing RADIUS and TACACS+ services. It supports the increasingly complex policies needed to meet today's new demands for access control management and compliance. Cisco Secure ACS provides central management of access policies for device administration and wireless, wired 802.1x, and remote VPN network 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.

Cisco Secure ACS RMI Privilege Escalation Vulernability

A vulnerability in the RMI interface of Cisco Secure ACS could allow an authenticated, remote attacker to perform actions as superadmin.

The vulnerability is due to insufficient authorization enforcement. An attacker could exploit this vulnerability by accessing the ACS via the RMI interface using an authenticated user account. An exploit could allow the attacker to perform superadmin functions via RMI.

This vulnerability is documented in Cisco bug ID CSCud75180 (registered customers only) and has been assigned CVE ID CVE-2014-0649.


Cisco Secure ACS RMI Unauthenticated User Access Vulnerability

A vulnerability in the RMI interface of Cisco Secure Access Control System (ACS) could allow an unauthenticated, remote attacker to access the ACS via the RMI interface.

The vulnerability is due to insufficient authentication and authorization enforcement. An attacker could exploit this vulnerability by accessing the ACS via the RMI interface. An exploit could allow the attacker to access the ACS and perform administrative actions.

This vulnerability is documented in Cisco bug ID CSCud75187 (registered customers only) and has been assigned CVE ID CVE-2014-0648.


The RMI interface transports data over TCP port 2020 and TCP port 2030. The RMI interface is utilized for communication between Cisco ACS nodes in a distributed deployment environment.


Cisco Secure ACS Operating System Command Injection Vulnerability

A vulnerability in the web interface of Cisco Secure ACS could allow an authenticated, remote attacker to inject operating system-level commands.

The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by injecting operating system commands into a specific location of the ACS web interface. An exploit could allow the attacker to perform operating system-level commands without shell access, impacting the confidentiality, integrity, or availability of the system.

This vulnerability is documented in Cisco bug ID CSCue65962 (registered customers only) and has been assigned CVE ID CVE-2014-0650.

Vulnerability Scoring Details

Cisco has scored the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps organizations determine the urgency and priority of a response.

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link:

http://intellishield.cisco.com/security/alertmanager/cvss



CSCud75180- RMI Privilege Escalation Vulnerability

Calculate the environmental score of CSCud75180

CVSS Base Score - 8.5

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

Single

Complete

Complete

Complete

CVSS Temporal Score - 7.0

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed




CSCud75187- Unauthenticated Access to RMI Vulnerability

Calculate the environmental score of CSCud75187

CVSS Base Score - 7.6

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

High

None

Complete

Complete

Complete

CVSS Temporal Score - 6.3

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed




CSCue65962- ACS GUI Arbitrary OS Command Injection Vulnerability

Calculate the environmental score of CSCue65962

CVSS Base Score - 8.5

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

Single

Complete

Complete

Complete

CVSS Temporal Score - 7.0

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed


Impact

Successful exploitation of the Cisco Secure ACS RMI Privilege Escalation Vulernability could allow an unprivileged, authenticated attacker to have privileged access to the affected system via the RMI interface.

Successful exploitation of the Cisco Secure ACS RMI Unauthenticated User Access Vulnerability could allow an unauthenticated attacker to have privileged access to the affected system via the RMI interface.

Successful exploitation of the Cisco Secure ACS Operating System Command Injection Vulnerability could allow an authenticated attacker to perform operating system-level commands from the ACS web interface.

Software Versions and Fixes

The following table provides first fixed release information for the Cisco Secure ACS release that are affected. The last row of the table gives information about the release version that includes the fix for all the vulnerabilities described in this advisory.

   5.0  5.1  5.2  5.3  5.4
 Cisco Secure ACS RMI Privilege Escalation Vulernability
Migrate to 5.5 or later
Migrate to 5.5 or later Migrate to 5.5 or later
Migrate to 5.5 or later  Migrate to 5.5
 Cisco Secure ACS RMI Unauthenticated User Access Vulnerability Migrate to 5.5 or later
Migrate to 5.5 or later Migrate to 5.5 or later Migrate to 5.5 or later  Migrate to 5.5
 Cisco Secure ACS Operating System Command Injection Vulnerability Migrate to 5.4 or later
Migrate to 5.4 or later Migrate to 5.4 or later  Migrate to 5.4 or later  5.4 Patch 3
 First Fixed release for all vulnerabilities in this advisory
         5.5

When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices 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 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.

Cisco Secure ACS 5.5 can be downloaded from the Software Center on Cisco.com by visiting http://www.cisco.com/cisco/software/navigator.html and navigating to Products > Security > Access Control and Policy > Policy and Access Management > Cisco Secure Access Control System > Cisco Secure Access Control System 5.5

Workarounds

There are no configuration workarounds available for these vulnerabilities.

Network-based mitigations for the RMI-based vulnerabilities are outlined in the Cisco Applied Mitigation Bulletin:

Identifying and Mitigating the Multiple Vulnerabilities in Cisco Secure Access Control System

http://tools.cisco.com/security/center/viewAMBAlert.x?alertId=32120

Obtaining Fixed Software

Cisco has released free software updates that addresses the vulnerabilities described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, upgrades should be obtained through the Software Navigator on Cisco.com at http://www.cisco.com/cisco/software/navigator.html.

Customers Using Third-Party Support Organizations

Customers with Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers, should contact that organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

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):

  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • e-mail: tac@cisco.com

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. Customers without service contracts should request free upgrades through the TAC.

Refer to Cisco Worldwide Contacts at http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and e-mail addresses for support in various languages.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

These vulnerabilities were found during internal testing.

Status of This Notice: Final

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 stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.


Distribution

This advisory is posted on Cisco Security Intelligence Operations at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140115-csacs

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:

  • cust-security-announce@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk

Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.


Revision History

Revision 1.0 2014-January-15 Initial public release.

Cisco Security Procedures

Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt.


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