-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Cisco Security Advisory: Apache HTTPd Range Header Denial of Service Vulnerability Advisory ID: cisco-sa-20110830-apache Revision 1.0 For Public Release 2011 August 30 1600 UTC (GMT) Summary ======= The Apache HTTPd server contains a denial of service vulnerability when it handles multiple, overlapping ranges. Multiple Cisco products may be affected by this vulnerability. Mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Intelligence companion document for this Advisory: http://tools.cisco.com/security/center/viewAMBAlert.x?alertId=24024 This advisory is posted at: http://www.cisco.com/warp/public/707/cisco-sa-20110830-apache.shtml Affected Products ================= Cisco is currently evaluating products for possible exposure to this vulnerability. Products will only be listed in the Vulnerable Products or Products Confirmed Not Vulnerable sections of this security advisory when a final determination about exposure is made. Products that are not listed in either of these two sections are still being evaluated. Vulnerable Products +------------------ This section will be updated when more information is available. The following products are confirmed to be affected by this vulnerability: * Cisco MDS 9000 NX-OS Software releases prior to 4.2.x are affected. Cisco MDS 9000 NX-OS Software releases 4.2.x and later are not affected. * Cisco NX-OS Software for Cisco Nexus 7000 Series Switches releases prior to 4.2.x are affected. Cisco NX-OS Software for Cisco Nexus 7000 Series Switches versions 4.2.x and later are not affected. * Cisco TelePresence Video Communication Server (Cisco TelePresence VCS) * Cisco Video Surveillance Manager (VSM) * Cisco Video Surveillance Operations Manager (VSOM) * Cisco Wireless Control System (WCS) Products Confirmed Not Vulnerable +-------------------------------- The following products are confirmed not vulnerable: * Cisco ASA 5500 Series Adaptive Security Appliances * Cisco Catalyst 6500 Series ASA Services Module * Cisco Catalyst 6500 Series Firewall Services Module * Cisco Fabric Manager * Cisco Identity Services Engine * Cisco Intercompany Media Engine * Cisco IOS Software * Cisco IOS XE Software * Cisco IOS XR Software * Cisco IP Interoperability and Collaboration System (IPICS) * Cisco Unified IP Phones * Cisco MDS 9000 NX-OS Software releases 4.2.x or later (prior versions are affected) * Cisco NX-OS Software for Nexus 7000 Series Switches releases 4.2.x or later (prior versions are affected) * Cisco Prime Central * Cisco Prime Optical * Cisco Prime Performance Manager * Cisco TelePresence Server * Cisco Unified Communications Manager (formerly Cisco CallManager) * Cisco Unity * Cisco Unity Connection * Cisco Wireless LAN Controllers (WLC) This section will be updated when more information is available. Details ======= The Apache HTTPd server contains a denial of service vulnerability when it handles multiple overlapping ranges. Multiple Cisco products may be affected by this vulnerability. The following Cisco bug IDs are being used to track potential exposure to this vulnerability. The following Cisco bug IDs do not confirm that a product is vulnerable; rather, the Cisco bug IDs indicate that the product is under investigation by the appropriate product teams. +--------------------------------------------------------------------------------------------+ | Cisco Product | Cisco bug ID | |----------------------------------------------------------------+---------------------------| | Cisco ACE 4710 Appliance | CSCts35635 | |----------------------------------------------------------------+---------------------------| | Cisco ACE Application Control Engine Module | CSCts35610 | |----------------------------------------------------------------+---------------------------| | Cisco ACE GSS 4400 Series Global Site Selector (GSS) | CSCts33313 | |----------------------------------------------------------------+---------------------------| | Cisco ACE XML Gateway | CSCts33321 | |----------------------------------------------------------------+---------------------------| | Cisco Active Network Abstraction | CSCts33317 | |----------------------------------------------------------------+---------------------------| | Cisco ASA 5500 Series Adaptive Security Appliances | CSCts33180 | |----------------------------------------------------------------+---------------------------| | Cisco CNS Network Registrar | CSCts36064 | |----------------------------------------------------------------+---------------------------| | Cisco Conductor for Videoscape | CSCts32986 | |----------------------------------------------------------------+---------------------------| | Cisco Content Delivery Engine | CSCts36206 | |----------------------------------------------------------------+---------------------------| | Cisco Content Delivery System Internet Streamer | CSCts35643 | |----------------------------------------------------------------+---------------------------| | Cisco Detector XT DDoS Mitigation Appliance | CSCts33211 | |----------------------------------------------------------------+---------------------------| | Cisco Guard XT DDoS Mitigation Appliance | CSCts33210 | |----------------------------------------------------------------+---------------------------| | Cisco Healthpresence | CSCts36069 | |----------------------------------------------------------------+---------------------------| | Cisco Identity Services Engine | CSCts33092 | |----------------------------------------------------------------+---------------------------| | Cisco IP Interoperability and Collaboration System | CSCts33206 | |----------------------------------------------------------------+---------------------------| | Cisco IP Phones | CSCts33264 | |----------------------------------------------------------------+---------------------------| | Cisco IPS Software | CSCts33199 | |----------------------------------------------------------------+---------------------------| | Cisco MDS 9000 SAN Device Management | CSCts33220 | |----------------------------------------------------------------+---------------------------| | Cisco MDS 9000 Series Multilayer Switches | CSCts33294 | |----------------------------------------------------------------+---------------------------| | Cisco NAC Manager | CSCts32965 | |----------------------------------------------------------------+---------------------------| | Cisco NAC Profiler | CSCts33267 | |----------------------------------------------------------------+---------------------------| | Cisco NAC Server | CSCts32976 | |----------------------------------------------------------------+---------------------------| | Cisco Network Analysis Module | CSCts33320 | |----------------------------------------------------------------+---------------------------| | Cisco Networking Services (CNS) Software | CSCts33279 | |----------------------------------------------------------------+---------------------------| | Cisco Nexus 5000 Series Switches | CSCts35605 | |----------------------------------------------------------------+---------------------------| | Cisco Nexus 7000 Series Switches | CSCts35665 | |----------------------------------------------------------------+---------------------------| | Cisco OnPlus Network Management and Automation | CSCts33287 | |----------------------------------------------------------------+---------------------------| | Cisco Prime Central | CSCts33004 | |----------------------------------------------------------------+---------------------------| | Cisco Prime Network Control System | CSCts33114 | |----------------------------------------------------------------+---------------------------| | Cisco Prime Performance Manager | CSCts36072 | |----------------------------------------------------------------+---------------------------| | Cisco Quad Collaboration | CSCts36158 | |----------------------------------------------------------------+---------------------------| | Cisco Secure Access Control System | CSCts33196 | |----------------------------------------------------------------+---------------------------| | Cisco Security Manager | CSCts33056 | |----------------------------------------------------------------+---------------------------| | Cisco Service Exchange Framework | CSCts33218 | |----------------------------------------------------------------+---------------------------| | Cisco Signaling Gateway Manager | CSCts33248 | |----------------------------------------------------------------+---------------------------| | Cisco Small Business Network Storage Systems | CSCts33288 | |----------------------------------------------------------------+---------------------------| | Cisco SSC System Manager | CSCts36187 | |----------------------------------------------------------------+---------------------------| | Cisco TelePresence Manager | CSCts33310 | |----------------------------------------------------------------+---------------------------| | Cisco TelePresence Multipoint Switch | CSCts33224 | |----------------------------------------------------------------+---------------------------| | Cisco TelePresence Server | CSCts33230 | |----------------------------------------------------------------+---------------------------| | Cisco CTS 500-32 Telepresence System Series | CSCts35874 | |----------------------------------------------------------------+---------------------------| | All Cisco CTS TelePresence Systems except Cisco CTS 500-32 | CSCts33276 | | TelePresence System Series | | |----------------------------------------------------------------+---------------------------| | Cisco Telepresence System Integrator C Series | CSCts35860 | |----------------------------------------------------------------+---------------------------| | Cisco UCS B-Series Blade Servers | CSCts33291 | |----------------------------------------------------------------+---------------------------| | Cisco Unified Communications Manager | CSCts32992 | |----------------------------------------------------------------+---------------------------| | Cisco Unified Communications System Voice and Unified | CSCts33271 | | Communications (VOSS) | | |----------------------------------------------------------------+---------------------------| | Cisco Unified MeetingPlace | CSCts33169 | |----------------------------------------------------------------+---------------------------| | Cisco Unified Operations Manager | CSCts33273 | |----------------------------------------------------------------+---------------------------| | Cisco Unified Presence Server | CSCts33257 | |----------------------------------------------------------------+---------------------------| | Cisco Unified Service Monitor | CSCts35893 | |----------------------------------------------------------------+---------------------------| | Cisco Unified Service Statistics Manager | CSCts36074 | |----------------------------------------------------------------+---------------------------| | Cisco Unity | CSCts33302 | |----------------------------------------------------------------+---------------------------| | Cisco Unity Connection | CSCts33260 | |----------------------------------------------------------------+---------------------------| | Cisco Video Surveillance Manager | CSCts33173 | |----------------------------------------------------------------+---------------------------| | Cisco Video Surveillance Operations Manager | CSCts33178 | |----------------------------------------------------------------+---------------------------| | Cisco Virtual Network Management | CSCts36207 | |----------------------------------------------------------------+---------------------------| | Cisco Voice Manager (CVM) | CSCts36152 | |----------------------------------------------------------------+---------------------------| | Cisco Wide Area Application Services (WAAS) Software | CSCts33254 | |----------------------------------------------------------------+---------------------------| | Cisco Wireless Control System (WCS) | CSCts33325 | |----------------------------------------------------------------+---------------------------| | Cisco Wireless Control System Navigator | CSCts33052 | |----------------------------------------------------------------+---------------------------| | Cisco Wireless LAN Controllers (WLC) | CSCts33327 | |----------------------------------------------------------------+---------------------------| | CiscoWorks Common Services | CSCts33049 | |----------------------------------------------------------------+---------------------------| | CiscoWorks LAN Management Solution (LMS) | CSCts35837 | |----------------------------------------------------------------+---------------------------| | Cisco Digital Media Suite Products | CSCts33189 | |----------------------------------------------------------------+---------------------------| | Management Center for Cisco Security Agents | CSCts33208 | |----------------------------------------------------------------+---------------------------| | Service Exchange Framework | CSCts36185 | |----------------------------------------------------------------+---------------------------| | Cisco Shared Network Management and Automation | CSCts33476 | +--------------------------------------------------------------------------------------------+ This vulnerability has been assigned the Common Vulnerabilities and Exposures (CVE) identifier CVE-2011-3192. Vulnerability Scoring Details +---------------------------- Cisco has provided scores for the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0. CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response. Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks. Cisco has provided an FAQ to answer additional questions regarding CVSS at http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at: http://intellishield.cisco.com/security/alertmanager/cvss * Apache HTTPd Range Header Denial of Service Vulnerability 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 - 7.8 Exploitability - High Remediation Level - Unavailable Report Confidence - Confirmed Impact ====== Successful exploitation of this vulnerability could cause significant memory and CPU utilization on affected products. Repeated exploitation could result in a sustained DoS condition. Software Versions and Fixes =========================== When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution. In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance. Cisco NX-OS Software +------------------- Cisco MDS 9000 NX-OS Software releases prior to 4.2.x are affected. Cisco MDS 9000 NX-OS Software releases 4.2.x and later are not affected. Cisco NX-OS Software for Cisco Nexus 7000 Series Switches releases prior to 4.2.x are affected. Cisco NX-OS Software for Cisco Nexus 7000 Series Switches releases 4.2.x and later are not affected. Cisco Video Surveillance Manager (VSM) +------------------------------------- No fixed software is available. Cisco Video Surveillance Operations Manager (VSOM) +------------------------------------------------- No fixed software is available. This section will be updated when more information is available. Workarounds =========== Mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Intelligence companion document for this Advisory: http://tools.cisco.com/security/center/viewAMBAlert.x?alertId=24024 Obtaining Fixed Software ======================== Cisco has released free software updates that address this vulnerability. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment. Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html or as otherwise set forth at Cisco.com Downloads 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, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com Customers using Third Party Support Organizations ================================================= Customers whose Cisco products 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 support organization for guidance and assistance with the appropriate course of action in regards to this advisory. The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed. Customers without Service Contracts =================================== Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows. * +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 their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC. Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages. Exploitation and Public Announcements ===================================== This vulnerability was initially reported to the Full Disclosure mailing list at the following link: http://seclists.org/fulldisclosure/2011/Aug/175 Apache has confirmed that it is aware of exploitation of this vulnerability. Cisco is not aware of malicious exploitation of this vulnerability related specifically to Cisco products. Proof-of-concept code is available for this vulnerability. Status of this Notice: INTERIM ============================== 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. CISCO EXPECTS TO UPDATE THIS DOCUMENT AS NEW INFORMATION BECOMES AVAILABLE. 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's worldwide website at: http://www.cisco.com/warp/public/707/cisco-sa-20110830-apache.shtml In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients. * 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 * comp.dcom.sys.cisco@newsgate.cisco.com Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates. Revision History ================ +---------------------------------------+ | Revision | | Initial | | 1.0 | 2011-August-30 | public | | | | release. | +---------------------------------------+ Cisco Security Procedures ========================= 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: http://www.cisco.com/en/US/products/products_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 +-------------------------------------------------------------------- Copyright 2010-2011 Cisco Systems, Inc. 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