[SANOG] Cisco Security Advisory: Multiple Vulnerabilities in Cisco IOS Software Traffic Optimization Features
Cisco Systems Product Security Incident Response Team
psirt at cisco.com
Wed Mar 28 16:20:57 UTC 2012
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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)
+--------------------------------------------------------------------
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 at cisco.com or security-alert at 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 at 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 at cisco.com
* first-bulletins at lists.first.org
* bugtraq at securityfocus.com
* vulnwatch at vulnwatch.org
* cisco at spot.colorado.edu
* cisco-nsp at puck.nether.net
* full-disclosure at 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.
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