A vulnerability in the Zone-Based Firewall (ZBFW) component of Cisco IOS Software could allow an unauthenticated, remote attacker to cause an affected device to hang or reload. The vulnerability is due to improper processing of specific HTTP packets when the device is configured for either Cisco IOS Content Filtering or HTTP application layer gateway (ALG) inspection. An attacker could exploit this vulnerability by sending specific HTTP packets through an affected device. An exploit could allow the attacker to cause an affected device to hang or reload. Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-cce Note: The September 25, 2013, Cisco IOS Software Security Advisory bundled publication includes eight Cisco Security Advisories. All advisories address vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security 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 Cisco IOS Software vulnerabilities in the September 2013 bundled publication. Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link: http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep13.html
Note: The September 25, 2013, Cisco IOS Software Security Advisory bundled publication includes eight Cisco Security Advisories. All advisories address vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security 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 Cisco IOS Software vulnerabilities in the September 2013 bundled publication.
Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep13.html
To verify whether Cisco IOS Content Filtering under the ZBFW is configured on a device use the show policy-map type inspect zone-pair urlfilter | include URL Filtering privileged EXEC command and check for output. A blank line indicates that the feature is not enabled. Output with URL Filtering is in indicates the device is configured with Cisco IOS Content Filtering under ZBFW. The following is the output from the show policy-map type inspect zone-pair urlfilter | include URL Filtering command executed on a device running Cisco IOS Software that has Cisco IOS Content Filtering enabled under the ZBFW configuration:ios-fw#show running-config < output removed for brevity > policy-map type inspect in->out class type inspect filtered-hosts inspect service-policy http http_bad class class-default drop ! zone security inside zone security outside zone-pair security in-to-out source inside destination outside service-policy type inspect in->out< output removed for brevity >ios-fw#
Note: Cisco IOS Content Filtering using ip inspect and ip urlfilter commands are not affected.ios-fw#show policy-map type inspect zone-pair urlfilter | include URL Filtering
URL Filtering is in
ios-fw#
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.
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 September 2013 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 (SIO) portal at http://tools.cisco.com/security/center/selectIOSVersion.x
Major Release | Availability of Repaired Releases | |
---|---|---|
Affected 12.0-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
There are no affected 12.0 based releases | ||
Affected 12.2-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
There are no affected 12.2 based releases | ||
Affected 12.3-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
There are no affected 12.3 based releases | ||
Affected 12.4-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
There are no affected 12.4 based releases | ||
Affected 15.0-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
There are no affected 15.0 based releases | ||
Affected 15.1-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
15.1EY | Not vulnerable |
Vulnerable; First fixed in Release 15.2S |
15.1GC | Vulnerable; First fixed in Release 15.1M Releases up to and including 15.1(2)GC2 are not vulnerable. |
Vulnerable; First fixed in Release 15.1M |
15.1M | Releases including and prior to 15.1(4)M1 are not vulnerable. First fixed in 15.1(4)M6. |
15.1(4)M7 |
15.1MR | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
15.1MRA | Not vulnerable |
15.1(3)MRA2 |
15.1S | Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.1(3)S6 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.1SG | Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.1(2)SG1 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.1SNG | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
15.1SNH | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
15.1SNI | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
15.1SVD | Not vulnerable |
Not vulnerable |
15.1SVE | Not vulnerable |
Not vulnerable |
15.1SVF | Not vulnerable |
Not vulnerable |
15.1SY | Not vulnerable |
15.1(1)SY2; Available on 28-OCT-13 15.1(2)SY |
15.1T | Not vulnerable |
Vulnerable; First fixed in Release 15.1M |
15.1XO | Not vulnerable |
Not vulnerable |
Affected 15.2-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
15.2E | Not vulnerable |
Not vulnerable |
15.2GC | 15.2(4)GC |
Vulnerable; migrate to any release in 15.4T |
15.2JA | Not vulnerable |
15.2(4)JA1 |
15.2JAX | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
15.2JB | Not vulnerable |
15.2(2)JB2 |
15.2JN | Not vulnerable |
Not vulnerable |
15.2M | Not vulnerable |
15.2(4)M4 |
15.2S | Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.2(4)S4 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability |
15.2SA | Not vulnerable |
15.2(2)SA |
15.2SNG | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
15.2SNH | Not vulnerable |
Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory. |
15.2SNI | Not vulnerable |
Vulnerable; First fixed in Release 15.3S |
15.2T | 15.2(1)T4 15.2(3)T4 |
15.2(3)T4 |
Affected 15.3-Based Releases | First Fixed Release | First Fixed Release for All Advisories in the September 2013 Cisco IOS Software Security Advisory Bundled Publication |
There are no affected 15.3 based releases |
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
Revision 1.0 | 2013-September-25 | Initial public release |
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