Cisco Applied Mitigation Bulletin-
Mitsubishi MX Component contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.
The vulnerability is due to improper handling of certain web pages by the affected software. An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to visit a malicious web page. When visited, it could allow the attacker to execute arbitrary code on a targeted system.
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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.
Effective exploit prevention can also be provided by the Cisco ACE Application Control Engine Appliance and Module using application protocol inspection.
Cisco ASA, Cisco ASASM, Cisco FWSM firewalls, and Cisco ACE Application Control Engine Appliance and Module can provide visibility through syslog messages and counter values displayed in the output from show commands.
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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
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 ActiveX control that is associated with this vulnerability.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.
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 a regex for the ActiveX Class ID !-- "B5D4B42F-AD6E-11D3-BE97-0090FE014643" that is associated !-- with this vulnerability ! regex CLSID_activeX "[bB]5[dD]4[bB]42[fF][-][aA][dD]6[eE][-] 11[dD]3[-][bB][eE]97[-]0090[fF][eE]014643" ! !-- Configure a regex class to match on the regular !-- expressions that are configured above ! class-map type regex match-any vulnerable_activeX_class match regex CLSID_activeX ! !-- 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 regex that is configured above ! policy-map type inspect http http_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 vulnerable_activeX_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 http_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 Cisco ASA 5500 Series Configuration Guide using the CLI, 8.2 for Configuring Object Groups and the Configuring Objects and Access Lists section of the Cisco Catalyst 6500 Series ASA Services Module CLI Configuration Guide, 8.5.
Additional information about HTTP application inspection and the MPF is in the HTTP Inspection Overview section of the Cisco ASA 5500 Series Configuration Guide using the CLI, 8.2.
Identification: Application Layer Protocol Inspection
Firewall syslog message 415007 will be generated when an HTTP message body matches a user-defined regular expression. The syslog message will identify the corresponding HTTP class and HTTP policy and indicate the action applied to the HTTP connection. Additional information about this syslog message is in Cisco ASA 5500 Series System Log Message, 8.2 - 415007.
Information about configuring syslog for the Cisco ASA 5500 Series Adaptive Security Appliance is in Monitoring - Configuring Logging. Information about configuring syslog for the Cisco Catalyst 6500 Series ASA Services Module is in Configuring Logging. Information about configuring syslog on the FWSM for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers is in Monitoring the Firewall Services Module.
In the following example, the show logging | grep regex command extracts syslog messages from the logging buffer on the firewall. These messages provide additional information about denied packets that could indicate attempts to exploit this vulnerability. Administrators can use different regular expressions with the grep keyword to search for specific data in the logged messages.
Additional information about regular expression syntax is in Creating a Regular Expression.
HTTP Application Inspection
firewall#show logging | grep 415007
Apr 3 2013 14:35:54: %ASA-5-415007: HTTP - matched Class 22: vulnerable_activeX_class in policy-map http_policy, Body matched - Dropping connection from inside:192.168.60.85/2130 to outside:192.0.2.63/80 Apr 3 2013 14:35:55: %ASA-5-415007: HTTP - matched Class 20: vulnerable_activeX_class in policy-map http_policy, Body matched - Dropping connection from inside:192.168.60.86/2133 to outside:192.0.2.63/80 Apr 3 2013 14:36:03: %ASA-5-415007: HTTP - matched Class 24: vulnerable_activeX_class in policy-map http_policy, Body matched - Dropping connection from inside:192.168.60.87/2129 to outside:192.0.2.63/80With HTTP application inspection enabled, the show service-policy inspect protocol command will identify the number of HTTP packets that are inspected and dropped by this feature. The following example shows output for show service-policy inspect http:
firewall# show service-policy inspect http Global policy: Service-policy: global_policy Class-map: inspection_default Class-map: Webports_Class Inspect: http http_policy, packet 5025, drop 20, reset-drop 0 protocol violations packet 0 match response body regex class vulnerable_activeX_class drop-connection log, packet 20In the preceding example, 5025 HTTP packets have been inspected and 20 HTTP packets have been dropped.
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 this vulnerability, 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 this vulnerability.
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 class that !-- looks for HTTP packets that contain the regex for the !-- ActiveX Class ID !-- "5EFE8CB1-D095-11D1-88FC-0080C859833B" !-- that is associated with this vulnerability ! class-map type http inspect match-any vulnerable_activeX_http_class match content ".*[bB]5[dD]4[bB]42[fF][-][aA][dD]6[eE][-] 11[dD]3[-][bB][eE]97[-]0090[fF][eE]014643.*" ! !-- Configure an HTTP application inspection policy that !-- identifies, resets, and logs connections that contain !-- the regex that are configured above ! policy-map type inspect http all-match http_policy class vulnerable_activeX_http_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_http_inspect_policy class L4_http_class inspect http policy http_policy ! !-- Apply the configuration globally across all interfaces, !-- which results in the inspection of all traffic that enters !-- the ACE ! service-policy input L4_http_inspect_policy
Identification: Application Protocol Inspection
HTTP Deep Packet Inspection
Cisco ACE Application Control Engine syslog message 415006 will be generated when the URI matches a user-defined regular expression. The syslog message will identify the corresponding HTTP class and HTTP policy and indicate the action applied to the HTTP connection. Additional information about this syslog message is in Cisco ACE 4700 Series Appliance System Message Guide - System Message 415006.
Cisco ACE Application Control Engine syslog message 415007 will be generated when an HTTP message body matches a user-defined regular expression. The syslog message will identify the corresponding HTTP class and HTTP policy and indicate the action applied to the HTTP connection. Additional information about this syslog message is in Cisco ACE 4700 Series Appliance System Message Guide - System Message 415007.
ACE/Admin# show logging | include 415007 Apr 3 2013 15:26:43: %ACE-5-415007: HTTP - matched vulnerable_activeX_http_class in policy-map L4_http_inspect_policy, Body matched - Resetting connection from vlan206:192.0.2.94/80 to vlan130:192.168.60.63/1776 Connection 0x3a Apr 3 2013 15:30:33: %ACE-5-415007: HTTP - matched vulnerable_activeX_http_class in policy-map L4_http_inspect_policy, Body matched - Resetting connection from vlan206:192.0.2.94/80 to vlan130:192.168.60.63/1778 Connection 0x3cWhen HTTP deep packet inspection is enabled, the show service-policy policynamedetail command will identify the number of HTTP connections that are inspected and dropped by this feature. The following example shows output for show service-policy L4_http_inspect_policy detail:
ACE/Admin# show service-policy L4_http_inspect_policy detail Status : ACTIVE
Description: -----------------------------------------
Context Global Policy: service-policy: L4_http_inspect_policy class: L4_http_class inspect http: L7 inspect policy : http_policy Url Logging: DISABLED curr conns : 0 , hit count : 1 dropped conns : 0 client pkt count : 3 , client byte count: 589 server pkt count : 3 , server byte count: 547 conn-rate-limit : 0 , drop-count : 0 bandwidth-rate-limit : 0 , drop-count : 0 L4 policy stats: Total Req/Resp: 4 , Total Allowed: 2 Total Dropped : 2 , Total Logged : 0 class/match : vulnerable_activeX_http_class Inspect action : reset log Total Inspected : 2 , Total Matched: 2 Total Dropped OnError: 0In the preceding example, 4 HTTP connections have been inspected and 2 HTTP connections have been dropped.
Additional information about HTTP Deep Packet Inspection and Application Protocol Inspection is in the Configuring Application Protocol Inspection section of the Cisco ACE 4700 Series Appliance Security Configuration Guide.
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Show LessVersion Description Section Date 1 Initial Release 2013-April-04 16:02 GMT
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The security vulnerability applies to the following combinations of products.
Primary Products IntelliShield Applied Mitigation Bulletin Original Release (Base)
Associated Products
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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 ALERTS AT ANY TIME.
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