Cisco Security Advisory: Multiple Vulnerabilities in Cisco IOS Software Traffic Optimization Features

2012-04-02T00:00:00
ID SECURITYVULNS:DOC:27858
Type securityvulns
Reporter Securityvulns
Modified 2012-04-02T00:00:00

Description

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Cisco Security Advisory: Multiple Vulnerabilities in Cisco IOS Software Traffic Optimization Features

Advisory ID: cisco-sa-20120328-mace

Revision 1.0

For Public Release 2012 March 28 16:00 UTC (GMT)

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Summary

Cisco IOS Software contains a denial of service (DoS) vulnerability in the Wide Area Application Services (WAAS) Express feature that could allow an unauthenticated, remote attacker to cause the router to leak memory or to reload.

Cisco IOS Software also contains a DoS vulnerability in the Measurement, Aggregation, and Correlation Engine (MACE) feature that could allow an unauthenticated, remote attacker to cause the router to reload.

An attacker could exploit these vulnerabilities by sending transit traffic through a router configured with WAAS Express or MACE. Successful exploitation of these vulnerabilities could allow an unauthenticated, remote attacker to cause the router to leak memory or to reload. Repeated exploits could allow a sustained DoS condition.

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-20120328-mace

Note: The March 28, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the March 2012 bundled publication.

Individual publication links are in "Cisco Event Response: Semi-Annual Cisco IOS Software Security Advisory Bundled Publication" at the following link:

http://www.cisco.com/web/about/security/intelligence/ Cisco_ERP_mar12.html

Affected Products

Vulnerable Products +------------------

Cisco devices that are running Cisco IOS Software are vulnerable when they are configured with the "mace enable" or "waas enable" interface configuration commands on one or more interfaces. Additional configuration is required for WAAS Express or MACE to be configured; more details follow.

Note: Cisco IOS Software is vulnerable only when configured for WAAS Express or MACE. Cisco IOS Software configured for WAAS, not WAAS Express, is not vulnerable.

For more information on WAAS Express, see http://www.cisco.com/en/US/products/ps11211/index.html. For more information about MACE, see http://www.cisco.com/en/US/prod/collateral/netmgtsw/ps11709/ps11671/guide_c07-664643.html.

To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the "show version" command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the "show version" command or may provide different output.

The following example identifies a Cisco product that is running Cisco IOS Software Release 15.0(1)M1 with an installed image name of C3900-UNIVERSALK9-M:

Router> show version Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2009 by Cisco Systems, Inc. Compiled Wed 02-Dec-09 17:17 by prod_rel_team

!--- output truncated

Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS and NX-OS Software Reference Guide" at http://www.cisco.com/web/about/security/intelligence/ios-ref.html.

Products Confirmed Not Vulnerable +--------------------------------

No other Cisco products are currently known to be affected by these vulnerabilities.

Details

The Cisco Wide Area Application Services (WAAS) Express feature allows optimization of the WAN bandwidth required to access centrally located applications. WAAS Express allows the traffic to be optimized by a Cisco Integrated Services Router (ISR G2), with no other devices required.

The Cisco Measurement, Aggregation, and Correlation Engine (MACE) is a Cisco IOS feature that is used for measurement and analysis of network traffic. The feature may be used with WAAS Express to give details of optimized traffic or used by itself to help measure application performance.

Cisco IOS Software contains a DoS vulnerability in the WAAS Express feature that could allow an unauthenticated, remote attacker to cause the router to leak memory or to reload. This vulnerability is documented in Cisco bug ID CSCtt45381 and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-1314.

Cisco IOS Software contains a DoS vulnerability in the MACE feature that could allow an unauthenticated, remote attacker to cause the router to reload. This vulnerability is documented in Cisco bug IDs CSCtq64987 and CSCtu57226 and has been assigned CVE ID CVE-2012-1312.

An attacker could exploit these vulnerabilities by sending transit traffic through a router configured with WAAS Express or MACE. Successful exploitation of these vulnerabilities could allow an unauthenticated, remote attacker to cause the router to leak memory or to reload. Repeated exploits could allow a sustained DoS condition.

A configuration similar to one or more of the following configuration excerpts will exist if WAAS Express or MACE is configured on the router.

The following example shows a partial WAAS Express configuration:

parameter-map type waas waas_global tfo optimize full class-map type waas match-any HTTP match tcp destination port 80 class-map type waas match-any NNTP match tcp destination port 119 ... policy-map type waas waas_global class HTTP optimize tfo dre lz application Web class NNTP optimize tfo dre lz application Email-and-Messaging ... interface <egress interface> waas enable

The following example shows a partial MACE configuration with WAAS Express already configured as shown in the preceding excerpt:

flow record type mace my-flow-record collect art all flow exporter my-flow-exporter export-protocol netflow-v9 destination 10.101.200.1 flow monitor type mace my-flow-monitor record my-flow-record exporter my-flow-exporter mace monitor waas all my-flow-monitor interface <egress interface> mace enable

The following example shows a partial MACE configuration without WAAS Express:

flow record type mace mace-flow-record collect datalink mac source address input collect ipv4 dscp collect interface input collect interface output collect application name collect waas all flow exporter flow-exporter1 destination 10.101.200.1 source <interface> output-features transport udp 32001 flow monitor type mace mace-flow-monitor1 record mace-flow-record exporter flow-exporter1 class-map type waas match-any HTTP match tcp destination port 80 match tcp destination port 8080 ... policy-map type mace mace_global class HTTP flow monitor mace-flow-monitor1 ... interface <egress interface> mace enable

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

  • CSCtt45381

CVSS Base Score - 7.8 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete

CVSS Temporal Score - 6.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

  • CSCtq64987 and CSCtu57226

CVSS Base Score - 7.1 Access Vector - Network Access Complexity - Medium Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete

CVSS Temporal Score - 5.9 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

Impact

Successful exploitation of these vulnerabilities could allow an unauthenticated, remote attacker to cause the router to leak memory or to reload. Repeated exploits could allow a sustained DoS condition.

Software Versions and Fixes

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 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 IOS Software +-----------------

Each row of the following Cisco IOS Software table corresponds to a Cisco IOS Software train. If a particular train is vulnerable, the earliest releases that contain the fix are listed in the First Fixed Release column. The First Fixed Release for All Advisories in the March 2012 Bundled Publication column lists the earliest possible releases that correct all the published vulnerabilities in the Cisco IOS Software Security Advisory bundled publication. Cisco recommends upgrading to the latest available release, where possible.

The Cisco IOS Software Checker allows customers to search for Cisco Security Advisories that address specific Cisco IOS Software releases. This tool is available on the Cisco Security Intelligence Operations (SIO) portal at:

http://tools.cisco.com/security/center/selectIOSVersion.x

+------------------------------------------------------------+ | Major | Availability of Repaired Releases | | Release | | |----------+-------------------------------------------------| | Affected | | First Fixed Release for All | |12.0-Based| First Fixed | Advisories in the March 2012 | | Releases | Release | Cisco IOS Software Security | | | | Advisory Bundled Publication | |------------------------------------------------------------| | There are no affected 12.0 based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for All | |12.2-Based| First Fixed | Advisories in the March 2012 | | Releases | Release | Cisco IOS Software Security | | | | Advisory Bundled Publication | |------------------------------------------------------------| | There are no affected 12.2 based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for All | |12.3-Based| First Fixed | Advisories in the March 2012 | | Releases | Release | Cisco IOS Software Security | | | | Advisory Bundled Publication | |------------------------------------------------------------| | There are no affected 12.3 based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for All | |12.4-Based| First Fixed | Advisories in the March 2012 | | Releases | Release | Cisco IOS Software Security | | | | Advisory Bundled Publication | |------------------------------------------------------------| | There are no affected 12.4 based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for All | |15.0-Based| First Fixed | Advisories in the March 2012 | | Releases | Release | Cisco IOS Software Security | | | | Advisory Bundled Publication | |------------------------------------------------------------| | There are no affected 15.0 based releases | |------------------------------------------------------------| | Affected | | First Fixed Release for All | |15.1-Based| First Fixed | Advisories in the March 2012 | | Releases | Release | Cisco IOS Software Security | | | | Advisory Bundled Publication | |----------+------------------+------------------------------| |15.1EY |Not vulnerable |15.1(2)EY2 | |----------+------------------+------------------------------| |15.1GC |Not vulnerable |15.1(2)GC2 | |----------+------------------+------------------------------| | |15.1(4)M4; |15.1(4)M4; Available on | |15.1M |Available on |30-MAR-12 | | |30-MAR-12 | | |----------+------------------+------------------------------| | | |Vulnerable; contact your | | | |support organization per the | |15.1MR |Not vulnerable |instructions in Obtaining | | | |Fixed Software section of this| | | |advisory. | |----------+------------------+------------------------------| | |Cisco IOS XE | | | |devices: Please |Cisco IOS XE devices: Please | |15.1S |see Cisco IOS XE |see Cisco IOS XE Software | | |Software |Availability | | |Availability | | |----------+------------------+------------------------------| | |Cisco IOS XE | | | |devices: Please |Cisco IOS XE devices: Please | |15.1SG |see Cisco IOS XE |see Cisco IOS XE Software | | |Software |Availability | | |Availability | | |----------+------------------+------------------------------| | | |Vulnerable; contact your | | | |support organization per the | |15.1SNG |Not vulnerable |instructions in Obtaining | | | |Fixed Software section of this| | | |advisory. | |----------+------------------+------------------------------| |15.1SNH |Not vulnerable |Not vulnerable | |----------+------------------+------------------------------| |15.1T |Not vulnerable |15.1(3)T3 | |----------+------------------+------------------------------| |15.1XB |Not vulnerable |Vulnerable; First fixed in | | | |Release 15.1T | |----------+------------------+------------------------------| | Affected | | First Fixed Release for All | |15.2-Based| First Fixed | Advisories in the March 2012 | | Releases | Release | Cisco IOS Software Security | | | | Advisory Bundled Publication | |----------+------------------+------------------------------| |15.2GC |15.2(1)GC2 |15.2(1)GC2 | |----------+------------------+------------------------------| |15.2S |Not vulnerable |15.2(1)S1 | | | | | |----------+------------------+------------------------------| | |15.2(1)T2 |15.2(1)T2 | | |15.2(2)T1 |15.2(2)T1 | |15.2T |15.2(3)T; |15.2(3)T; Available on | | |Available on |30-MAR-12 | | |30-MAR-12 | | +------------------------------------------------------------+

For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and Cisco IOS XE 3SG Release Notes.

Cisco IOS XE Software +--------------------

Cisco IOS XE Software is not affected by the vulnerabilities that are disclosed in this document.

Cisco IOS XR Software +--------------------

Cisco IOS XR Software is not affected by any of the vulnerabilities disclosed in the March 2012 Cisco IOS Software Security Advisory Bundled Publication.

Workarounds

There are no workarounds for these vulnerabilities.

There is no Applied Mitigation Bulletin (AMB) for this advisory.

Obtaining Fixed Software

Cisco has released free software updates that address 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, or as set forth at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades.

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 Center on Cisco.com at http://www.cisco.com.

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 initially found by Cisco 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-20120328-mace

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 | 2012-March-28 | 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/en/US/products/products_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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux)

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