Cisco Applied Mitigation Bulletin-
Microsoft announced 5 security bulletins that address 22 vulnerabilities as part of the monthly security bulletin release on March 11, 2014. A summary of these bulletins is on the Microsoft website at http://technet.microsoft.com/en-us/security/bulletin/ms14-mar. This document provides identification and mitigation techniques that administrators can deploy on Cisco network devices.
The vulnerabilities that have a client software attack vector, can be exploited locally on the vulnerable device, require user interaction, or can be exploited using web-based attacks (these include but are not limited to cross-site scripting, phishing, and web-based email threats) or email attachments, or files stored on network shares are in the following list:
The vulnerability that has a network mitigation is in the following list. Cisco devices provide several countermeasures for the vulnerability that has a network attack vector, which will be discussed in detail later in this document.
Information about affected and unaffected products is available in the respective Microsoft advisories and the Cisco Alerts that are referenced in Cisco Event Response: Microsoft Security Bulletin Release for March 2014.
In addition, multiple Cisco products use Microsoft operating systems as their base operating system. Cisco products that may be affected by the vulnerabilities described in the referenced Microsoft advisories are detailed in the "Associated Products" table in the "Product Sets" section.
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Microsoft Security Bulletin MS14-014: Vulnerability in Silverlight Could Allow Security Feature Bypass (2932677): This vulnerability has been assigned Common Vulnerabilities and Exposures (CVE) identifiers CVE-2014-0319. This vulnerability can be exploited remotely, without authentication and requires user interaction.
Successful exploitation of the vulnerability that is associated with CVE-2014-0319 may bypass the microsoft security feature DEP/ASLR DEP (Data Execution Prevention) and allow chained exploits that result in arbitrary code execution. The attack vector for exploitation of CVE-2014-0319 is through HTTP packets that typically use TCP port 80 but may also use TCP ports 3128, 8000, 8010, 8080, 8888, and 24326.
Information about vulnerable, unaffected, and fixed software is available in the Microsoft Security Bulletin Summary for March 2014, which is available at the following link: http://www.microsoft.com/technet/security/bulletin/ms14-mar.mspx
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Mitigation Technique Overview
The vulnerabilities that require user interaction, or can be exploited using web-based attacks (these include but are not limited to cross-site scripting, phishing, and web-based email threats) or email attachments, or files stored on network shares are in the following list:
These vulnerabilities are mitigated most successfully at the endpoint through software updates, user education, desktop administration best practices, and endpoint protection software such as antivirus products.
The vulnerability that has a network mitigation is in the following list. Cisco devices provide several countermeasures for this vulnerability. This section of the document provides an overview of these techniques.
Effective exploit prevention can be provided by the Cisco ASA 5500 Series Adaptive Security Appliance, Cisco Catalyst 6500 Series ASA Services Module (ASASM), and the Firewall Services Module (FWSM) for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers using Application layer protocol inspection.
This protection mechanism filters and drops packets that are attempting to exploit the vulnerability that has a network attack vector.
Effective exploit prevention can also be provided by the Cisco ACE Application Control Engine Appliance and Module using application protocol inspection.
Effective use of Cisco Intrusion Prevention System (IPS) event actions provides visibility into and protection against attacks that attempt to exploit this vulnerability as discussed later in this document.
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Organizations are advised to follow their standard risk evaluation and mitigation processes to determine the potential impact of this vulnerability. Triage refers to sorting projects and prioritizing efforts that are most likely to be successful. Cisco has provided documents that can help organizations develop a risk-based triage capability for their information security teams. Risk Triage for Security Vulnerability Announcements and Risk Triage and Prototyping can help organizations develop repeatable security evaluation and response processes.
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Device-Specific Mitigation and Identification
Caution: The effectiveness of any mitigation technique depends on specific customer situations such as product mix, network topology, traffic behavior, and organizational mission. As with any configuration change, evaluate the impact of this configuration prior to applying the change.
Specific information about mitigation and identification is available for these devices:
Cisco ASA, Cisco ASASM, and Cisco FWSM Firewalls
Mitigation: Application Layer Protocol Inspection
Application layer protocol inspection is available beginning in software release 7.2(1) for the Cisco ASA 5500 Series Adaptive Security Appliance, software release 8.5 for the Cisco Catalyst 6500 Series ASA Services Module, and in software release 4.0(1) for the Cisco Firewall Services Module. This advanced security feature performs deep packet inspection of traffic that transits the firewall. Administrators may construct an inspection policy for applications that require special handling through the configuration of inspection class maps and inspection policy maps, which are applied by means of a global or interface service policy.
Additional information about application layer protocol inspection is in the Configuring Application Layer Protocol Inspection section of the Cisco ASA 5500 Series Configuration Guide using the CLI, 8.2 and the Configuring Application Inspection section of the Cisco Catalyst 6500 Series ASA Services Module CLI Configuration Guide, 8.5.
Caution: Application layer protocol inspection will decrease firewall performance. Administrators are advised to test performance impact in a lab environment before this feature is deployed in production environments.
HTTP Application Inspection
For MS14-014, by using the HTTP inspection engine on the Cisco ASA 5500 Series Adaptive Security Appliances, Cisco 6500 Series ASA Services Modules, and the Cisco Firewall Services Module, administrators can configure regular expressions (regexes) for pattern matching and construct inspection class maps and inspection policy maps. These methods can help protect against specific vulnerabilities, such as the one described in this document, and other threats that may be associated with HTTP traffic. The following HTTP application inspection configuration uses the Cisco Modular Policy Framework (MPF) to create a policy for inspection of traffic on TCP ports 80, 3128, 8000, 8010, 8080, 8888, and 24326, which are the default ports for the Cisco IPS #WEBPORTS variable. The HTTP application inspection policy will drop connections where the HTTP response body contains any of the regexes that are configured to match the Silverlight content that is associated with these vulnerabilities.Caution: The configured regexes can match text strings at any location in the body of an HTML response. Care should be taken to ensure that legitimate business applications that use matching text strings without calling the ActiveX control are not affected. Additional information about regex syntax is in Creating a Regular Expression. The regexes are specifically examining ActiveX used with Microsoft Internet Explorer browsers.
Additional information about ActiveX exploits and mitigations that leverage Cisco firewall technologies is available in the Preventing ActiveX Exploits with Cisco Firewall Application Layer Protocol Inspection Cisco Security white paper.
! !-- Configure regexes that are associated with these vulnerabilities: !-- Known CLSID for Silverlight DFEAF541-F3E1-4c24-ACAC-99C30715084A !-- ms14-014 Silverlight application type: application/x-silverlight ! regex CLSID_MS14-014 "[dD][fF][eE][aA][fF]541[-][fF]3[eE]1[-] 4[cC]24-[aA][cC][aA][cC][-]99[cC]30715084[aA]" regex ms14-014_regex "application\x2f[Xx]\x2d [Ss][Ii][Ll][Vv][Ee][Rr][Ll][Ii][Gg][Hh][Tt]" ! !-- Configure regex classes to match on the regular !-- expressions that are configured above ! class-map type regex match-any ms14-014_regex_class match regex CLSID_MS14-014 match regex ms14-014_regex ! !-- Configure an object group for the default ports that !-- are used by the Cisco IPS #WEBPORTS variable, which !-- are TCP ports 80 (www), 3128, 8000, 8010, 8080, 8888, !-- and 24326 ! object-group service WEBPORTS tcp port-object eq www port-object eq 3128 port-object eq 8000 port-object eq 8010 port-object eq 8080 port-object eq 8888 port-object eq 24326 ! !-- Configure an access list that uses the WEBPORTS object !-- group, which will be used to match TCP packets that !-- are destined to the #WEBPORTS variable that is used !-- by a Cisco IPS device ! access-list Webports_ACL extended permit tcp any any object-group WEBPORTS ! !-- Configure a class that uses the above-configured !-- access list to match TCP packets that are destined !-- to the ports that are used by the Cisco IPS #WEBPORTS !-- variable ! class-map Webports_Class match access-list Webports_ACL ! !-- Configure an HTTP application inspection policy that !-- identifies, drops, and logs connections that contain !-- the regexes that are configured above ! policy-map type inspect http MS_Mar_2014_policy parameters ! !-- "body-match-maximum" indicates the maximum number of !-- characters in the body of an HTTP message that !-- should be searched in a body match. The default value is !-- 200 bytes. A large number such as shown here may have an !-- impact on system performance. Administrators are advised !-- to test performance impact in a lab environment before !-- this command is deployed in production environments ! body-match-maximum 1380 match response body regex class ms14-014_regex_class drop-connection log ! !-- Add the above-configured "Webports_Class" that matches !-- TCP packets that are destined to the default ports !-- that are used by the Cisco IPS #WEBPORTS variable to !-- the default policy "global_policy" and use it to !-- inspect HTTP traffic that transits the firewall ! policy-map global_policy class Webports_Class inspect http MS_Mar_2014_policy ! !-- By default, the policy "global_policy" is applied !-- globally, which results in the inspection of !-- traffic that enters the firewall from all interfaces ! service-policy global_policy global
For additional information about the configuration and use of object groups, reference the Configuring Objects and ACLs section of Book 1: Cisco ASA Series General Operations CLI Configuration Guide, 9.1.
Additional information about HTTP application inspection and the MPF is in the HTTP Inspection section of Book 2: Cisco ASA Series Firewall CLI Configuration Guide, 9.1.
For information on using the Cisco Firewall command line interface to gauge the effectiveness of application inspection, please refer to the Cisco Security white paper Identification of Security Exploits with Cisco ASA, Cisco ASASM, and Cisco FWSM Firewalls.Cisco ACE
Mitigation: Application Protocol Inspection
Application protocol inspection is available for the Cisco ACE Application Control Engine Appliance and Module. This advanced security feature performs deep packet inspection of traffic that transits the Cisco ACE device. Administrators can construct an inspection policy for applications that require special handling through the configuration of inspection class maps and inspection policy maps, which are applied via a global or interface service policy.
Additional information about application protocol inspection is in the Configuring Application Protocol Inspection section of the Cisco ACE 4700 Series Appliance Security Configuration Guide.
HTTP Deep Packet Inspection
To conduct HTTP deep packet inspection for ms14-014, administrators can configure regular expressions (regexes) for pattern matching and construct inspection class maps and inspection policy maps. These methods can help protect against specific vulnerabilities, such as the one described in this document, and other threats that may be associated with HTTP traffic. The following HTTP application protocol inspection configuration inspects traffic on TCP ports 80, 3128, 8000, 8010, 8080, 8888, and 24326, which are the default ports for the Cisco IPS #WEBPORTS variable. The HTTP application protocol inspection policy will drop connections where the HTTP content contains any of the regexes that are configured to match the ActiveX control that is associated with these vulnerabilities.
Caution: The configured regexes can match text strings at any location in the content of an HTML packet. Care should be taken to ensure that legitimate business applications that use matching text strings without calling the ActiveX control are not affected.
Additional information about ActiveX exploits and mitigations that leverage the Cisco ACE Application Control Engine Appliance and Module is available in the Preventing ActiveX Exploits with Cisco Application Control Engine Application Layer Protocol Inspection Cisco Security white paper.
! !-- Configure an HTTP application inspection classes that !-- looks for HTTP packets that contain !-- ms14-014 Silverlight application type: application/x-silverlight ! class-map type http inspect match-any ms14-014_class
match content ".*[dD][fF][eE][aA][fF]541[-][fF]3[eE]1[-] 4[cC]24-[aA][cC][aA][cC][-]99[cC]30715084[aA]"
match content ".*application\x2f[Xx]\x2d [Ss][Ii][Ll][Vv][Ee][Rr][Ll][Ii][Gg][Hh][Tt].*" ! !-- Configure an HTTP application inspection policy that !-- identifies, resets, and logs connections that contain !-- the regexes that are configured above ! policy-map type inspect http all-match MS_Mar_2014 class ms14-014_class reset log ! !-- Configure an access list that matches TCP packets !-- that are destined to the #WEBPORTS variable that is !-- used by a Cisco IPS device ! access-list WEBPORTS line 8 extended permit tcp any any eq www access-list WEBPORTS line 16 extended permit tcp any any eq 3128 access-list WEBPORTS line 24 extended permit tcp any any eq 8000 access-list WEBPORTS line 32 extended permit tcp any any eq 8010 access-list WEBPORTS line 40 extended permit tcp any any eq 8080 access-list WEBPORTS line 48 extended permit tcp any any eq 8888 access-list WEBPORTS line 56 extended permit tcp any any eq 24326 ! !-- Configure a Layer 4 class that uses the above-configured !-- access list to match TCP packets that are destined !-- to the ports that are used by the Cisco IPS #WEBPORTS !-- variable ! class-map match-all L4_http_class match access-list WEBPORTS ! !-- Configure a Layer 4 policy that applies the HTTP application !-- inspection policy configured above to TCP packets that !-- are destined to the ports that are used by the Cisco IPS !-- #WEBPORTS variable ! policy-map multi-match L4_MS_Mar_2014 class L4_http_class inspect http policy MS_Mar_2014 ! !-- Apply the configuration globally across all interfaces, !-- which results in the inspection of all traffic that enters !-- the ACE ! service-policy input L4_MS_Mar_2014
For information on how to use the ACE command line interface to gauge the effectiveness of application inspection, please refer to the Cisco Security white paper Identification of Malicious Traffic Using Cisco ACE.Cisco Intrusion Prevention System
Mitigation: Cisco IPS Signature Event Actions
Administrators can use the Cisco IPS appliances and services modules to provide threat detection and help prevent attempts to exploit several of the vulnerabilities described in this document. The following table provides an overview of CVE identifiers and the respective Cisco IPS signatures that will trigger events on potential attempts to exploit these vulnerabilities.
CVE ID Signature Release Signature ID Signature Name Enabled Severity Fidelity* CVE-2014-0299 S776 3887/0 Microsoft Internet Explorer Remote Code Execution Yes High 85 CVE-2014-0302 S776 3875/0 Microsoft Internet Explorer Internet Explorer Use After Free Vulnerability Yes High 85 CVE-2014-0303 S776 3867/0 Microsoft Internet Explorer Memory Corruption Yes High 85 CVE-2014-0304 S776 3868/0 Microsoft Internet Explorer Memory Corruption Yes High 85 CVE-2014-0305 S776 3881/0 Microsoft Internet Explorer Memory Corruption Yes High 85 CVE-2014-0309 S776 3841/0 Microsoft Internet Explorer Remote Memory Corruption Yes High 85 CVE-2014-0311 S776 3876/0 Microsoft Internet Explorer Use After free Vulnerability Yes High 85 CVE-2014-0312 S776 3882/0 Microsoft Internet Explorer Remote Code Execution Vulnerability Yes High 90 CVE-2014-0313 S776 3877/0 Microsoft Internet Explorer Memory Corruption vulnerability Yes High 85 CVE-2014-0322 S776 3769/0 Internet Explorer Memory Corruption Vulnerability Yes High 90 3771/0-2 Internet Explorer Memory Corruption Vulnerability Yes High 90 CVE-2014-0324 S776 3878/0 Microsoft Internet Explorer Memory Corruption Yes High 90 * Fidelity is also referred to as Signature Fidelity Rating (SFR) and is the relative measure of the accuracy of the signature (predefined). The value ranges from 0 through 100 and is set by Cisco Systems, Inc.
Administrators can configure Cisco IPS sensors to perform an event action when an attack is detected. The configured event action performs preventive or deterrent controls to help protect against an attack that is attempting to exploit the vulnerabilities listed in the preceding table.
Cisco IPS sensors are most effective when deployed in inline protection mode combined with the use of an event action. Automatic Threat Prevention for Cisco IPS 7.x and 6.x sensors that are deployed in inline protection mode provides threat prevention against an attack that is attempting to exploit the vulnerability that is described in this document. Threat prevention is achieved through a default override that performs an event action for triggered signatures with a riskRatingValue greater than 90.
For additional information about the risk rating and threat rating calculation, see Risk Rating and Threat Rating: Simplify IPS Policy Management.
Cisco Sourcefire Signature Information
The following Cisco Sourcefire Snort signatures are available for the Microsoft February 2014 Security Update:
Microsoft Advisory ID Applicable Rules MS14-012
1:29717 MS14-012
1:29718 MS14-012
1:29719 MS14-012
1:29720 MS14-012
1:30106 MS14-012
1:30107 MS14-012
1:30108 MS14-012
1:30109 MS14-012
1:30110 MS14-012
1:30111 MS14-012
1:30112 MS14-012
1:30113 MS14-012
1:30114 MS14-012
1:30115 MS14-012
1:30116 MS14-012
1:30117 MS14-012
1:30118 MS14-012
1:30119 MS14-012
1:30120 MS14-012
1:30121 MS14-012
1:30122 MS14-012
1:30123 MS14-012
1:30124 MS14-012
1:30125 MS14-012
1:30126 MS14-012
1:30127 MS14-012
1:30128 MS14-012
1:30129 MS14-012
1:30130 MS14-012
1:30131 MS14-012
1:30132 MS14-012
1:30140 MS14-012
1:30141 MS14-012
1:30142 MS14-012
1:30143 MS14-012
1:30144 MS14-012
1:30145
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Show LessVersion Description Section Date 1 Initial Release 2014-March-11 17:16 GMT
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Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.
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The security vulnerability applies to the following combinations of products.
Primary Products Microsoft, Inc. Internet Explorer 6.0 (Base) | 7.0 (Base) | 8.0 (Base) | 9.0 (Base) | 10.0 (Base) | 11.0 (Base) Silverlight 5 (Base) Windows 7 for 32-bit systems (SP1) | for x64-based systems (SP1) Windows 8 for 32-bit systems (Base) | for x64-based systems (Base) Windows 8.1 for 32-bit Systems (Base) | for x64-based Systems (Base) Windows RT 8.1 (Base) Windows Server 2003 Datacenter Edition (SP2) | Datacenter Edition, 64-bit (Itanium) (SP2) | Datacenter Edition x64 (AMD/EM64T) (SP2) | Enterprise Edition (SP2) | Enterprise Edition, 64-bit (Itanium) (SP2) | Enterprise Edition x64 (AMD/EM64T) (SP2) | Standard Edition (SP2) | Standard Edition, 64-bit (Itanium) (SP2) | Standard Edition x64 (AMD/EM64T) (SP2) | Web Edition (SP2) Windows Server 2008 Datacenter Edition (SP2) | Datacenter Edition, 64-bit (SP2) | Itanium-Based Systems Edition (SP2) | Enterprise Edition (SP2) | Enterprise Edition, 64-bit (SP2) | Essential Business Server Standard (SP2) | Essential Business Server Premium (SP2) | Essential Business Server Premium, 64-bit (SP2) | Standard Edition (SP2) | Standard Edition, 64-bit (SP2) | Web Server (SP2) | Web Server, 64-bit (SP2) Windows Server 2008 R2 x64-Based Systems Edition (SP1) | Itanium-Based Systems Edition (SP1) Windows Server 2012 Original Release (Base) Windows Server 2012 R2 Original Release (Base) Windows Vista Home Basic (SP2) | Home Premium (SP2) | Business (SP2) | Enterprise (SP2) | Ultimate (SP2) | Home Basic x64 Edition (SP2) | Home Premium x64 Edition (SP2) | Business x64 Edition (SP2) | Enterprise x64 Edition (SP2) | Ultimate x64 Edition (SP2)
Associated Products Microsoft, Inc. Windows 7 for 32-bit systems | for x64-based systems Windows 8 for 32-bit systems | for x64-based systems Windows 8.1 for 32-bit Systems | for x64-based Systems Windows RT Original Release (Base) | 8.1 Windows Server 2003 Datacenter Edition | Datacenter Edition, 64-bit (Itanium) | Datacenter Edition x64 (AMD/EM64T) | Enterprise Edition | Enterprise Edition, 64-bit (Itanium) | Enterprise Edition x64 (AMD/EM64T) | Standard Edition | Standard Edition, 64-bit (Itanium) | Standard Edition x64 (AMD/EM64T) | Web Edition Windows Server 2008 Datacenter Edition | Datacenter Edition, 64-bit | Itanium-Based Systems Edition | Enterprise Edition | Enterprise Edition, 64-bit | Essential Business Server Standard | Essential Business Server Premium | Essential Business Server Premium, 64-bit | Standard Edition | Standard Edition, 64-bit | Web Server | Web Server, 64-bit Windows Server 2008 R2 x64-Based Systems Edition (Base) | Itanium-Based Systems Edition (Base) Windows Server 2012 Original Release Windows Server 2012 R2 Original Release Windows Vista Home Basic | Home Premium | Business | Enterprise | Ultimate | Home Basic x64 Edition | Home Premium x64 Edition | Business x64 Edition | Enterprise x64 Edition | Ultimate x64 Edition
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