ID

VAR-200809-0358

CVE

CVE-2008-3812

TITLE

Cisco IOS of IOS firewall Application Inspection Control (AIC) Service disruption in (DoS) Vulnerabilities

DESCRIPTION

Cisco IOS 12.4, when IOS firewall Application Inspection Control (AIC) with HTTP Deep Packet Inspection is enabled, allows remote attackers to cause a denial of service (device reload) via a malformed HTTP transit packet. A successful exploit may cause affected devices to reload, denying service to legitimate users. Cisco IOS is the Internet operating system used on Cisco networking equipment. Cisco has released free software updates that address this vulnerability. A mitigation for this vulnerability is available. See the "Workarounds" section for details. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml Note: The September 24, 2008 IOS Advisory bundled publication includes twelve Security Advisories. Eleven of the advisories address vulnerabilities in Cisco's IOS software, and one advisory addresses vulnerabilities in Cisco Unified Communications Manager. Each Advisory lists the releases that correct the vulnerability described in the Advisory. Please reference the following software table to find a release that fixes all published IOS software Advisories as of September 24th, 2008: http://www.cisco.com/warp/public/707/cisco-sa-20080924-bundle.shtml Individual publication links are listed below: * http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-cucm.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml * http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml Affected Products ================= The HTTP AIC feature was introduced in Cisco IOS Software Release 12.4(9)T. The software table in this advisory identifies the affected releases. To determine the software running on a Cisco IOS product, log in to the device and issue the show version command-line interface (CLI) command to display the system banner. Cisco IOS software will identify itself as "Internetwork Operating System Software" or simply "IOS." On the next line of output, the image name will be displayed between parentheses, followed by "Version" and the Cisco IOS release name. Other Cisco devices will not have the show version command, or will give different output. The following example shows output from a device running Cisco IOS image 12.4(15)T2: router#show version Cisco IOS Software, 1841 Software (C1841-ADVSECURITYK9-M), Version 12.4(15)T2, RELEASE SOFTWARE (fc7) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2008 by Cisco Systems, Inc. Compiled Thu 17-Jan-08 23:12 by prod_rel_team !--- Output truncated. Additional information on the Cisco IOS release naming conventions can be found on the document entitled "White Paper: Cisco IOS Reference Guide", which is available at http://www.cisco.com/warp/public/620/1.html The device is vulnerable if the configuration has a Layer 7 class map and Layer 7 policy map for HTTP deep packet inspection (DPI), and these policies are applied to any firewall zone. If the output contains Policy: http layer7-policymap name , the device is vulnerable. IOS releases before 12.4(9)T are not affected by this issue. Products confirmed not vulnerable include: * Cisco PIX * Cisco ASA * Cisco Firewall Services Module (FWSM) * The Virtual Firewall (VFW) application on the multiservice blade (MSB) on the Cisco XR 12000 Series Router Details ======= Firewalls are networking devices that control access to an organization's network assets. Firewalls are often positioned at the entrance points into networks. Cisco IOS software provides a set of security features that enable you to configure a simple or elaborate firewall policy, according to your particular requirements. HTTP uses port 80 by default to transport Internet web services, which are commonly used on the network and rarely challenged with regard to their legitimacy and conformance to standards. Because port 80 traffic is typically allowed through the network without being challenged, many application developers are leveraging HTTP traffic as an alternative transport protocol that will allow their application's traffic to travel through or even bypass the firewall. It also detects users who are tunneling applications through port 80. If the packet is not in compliance with the HTTP protocol, it will be dropped, the connection will be reset, and a syslog message will be generated, as appropriate. HTTP runs over TCP. For this vulnerability to be exploited, a full three-way handshake between client and server is required before any malicious traffic would be processed to result in a device reload. 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 CSCsh12480 - IOSFW with HTTP AIC may reload on processing crafted HTTP packet 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 Impact ====== Successful exploitation of the vulnerability may result in a reload of the affected device. Repeated exploitation attempts may result in a sustained denial of service attack. 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. Each row of the Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Recommended Release" column indicates the releases which have fixes for all the published vulnerabilities at the time of this Advisory. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table. +-------------------------------------------------------------------+ | Major Release | Availability of Repaired Releases | |-----------------+-------------------------------------------------| | Affected | | Recommended | | 12.0-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.0 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.1-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.1 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.2-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.2 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.3-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.3 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.4-Based | First Fixed Release | Release | | Releases | | | |-----------------+-----------------------------------+-------------| | 12.4 | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JA | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JK | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JL | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JMA | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JMB | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JMC | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4JX | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4MD | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4MR | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4SW | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | | Releases prior to 12.4(9)T are | | | | not vulnerable. First fixed in: | | | | | | | 12.4T | 12.4(9)T7 | 12.4(15)T7 | | | | | | | 12.4(11)T4 | | | | | | | | 12.4(15)T | | |-----------------+-----------------------------------+-------------| | 12.4XA | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XB | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XC | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XD | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XE | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |-----------------+-----------------------------------+-------------| | 12.4XF | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XG | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XJ | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |-----------------+-----------------------------------+-------------| | 12.4XK | Vulnerable; first fixed in 12.4T | 12.4(15)T7 | |-----------------+-----------------------------------+-------------| | 12.4XL | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XM | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XN | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XP | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XQ | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XT | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XV | Vulnerable; contact TAC | | |-----------------+-----------------------------------+-------------| | 12.4XW | 12.4(11)XW1 | 12.4(11)XW9 | |-----------------+-----------------------------------+-------------| | 12.4XY | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4XZ | Not Vulnerable | | |-----------------+-----------------------------------+-------------| | 12.4YA | Not Vulnerable | | +-------------------------------------------------------------------+ Workarounds =========== There are no known workarounds for this vulnerability. All other firewall features will continue to perform normally. This example shows an existing configuration, followed by how to remove AIC HTTP Deep Packet Inspection: !--- Existing Configuration ! parameter-map type inspect global ! class-map type inspect http match-any layer7-classmap class-map type inspect match-any layer4-classmap match protocol http ! policy-map type inspect http layer7-policymap class type inspect http layer7-classmap allow class class-default policy-map type inspect layer4-policymap class type inspect layer4-classmap inspect global service-policy http layer7-policymap class class-default ! zone security inside description ** Inside Network ** zone security outside description ** Outside Network ** zone-pair security in2out source inside destination outside description ** Zone Pair - inside to outside ** service-policy type inspect layer4-policymap Remove the service-policy from the zone-pair in question: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#zone-pair security in2out source inside destination outside Router(config-sec-zone-pair)#no service-policy type inspect layer4-policymap Router(config-sec-zone-pair)#exit Remove the linkage between policy-map type inspect layer4-policymap and policy-map type inspect http layer7-policymap: Router(config)#policy-map type inspect layer4-policymap Router(config-pmap)#class type inspect layer4-classmap Router(config-pmap-c)#no service-policy http layer7-policymap Router(config-pmap-c)#exit Router(config-pmap)#exit Reapply the service-policy to the zone-pair in question: Router(config)#zone-pair security in2out source inside destination outside Router(config-sec-zone-pair)#service-policy type inspect layer4-policymap Router(config-sec-zone-pair)#exit Although not required, for completeness of the configuration the policy-map type inspect http layer7-policymap and class-map type inspect http match-any layer7-classmap are recommended to be removed. Router(config)#no policy-map type inspect http layer7-policymap Router(config)#no class-map type inspect http match-any layer7-classmap Router(config)#exit Router# 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/products/prod_warranties_item09186a008088e31f.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/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages. Exploitation and Public Announcements ===================================== The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory. This vulnerability was found by Cisco 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's worldwide website at: http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.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 | 2008-September-24 | 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkjaLbkACgkQ86n/Gc8U/uBSqwCgi7dmsFhp1u9fxWgLqVpMPtV+ fuIAn3f11gNGT/LITk11YI6fjv7W1Q20 =0tmt -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/ . ---------------------------------------------------------------------- Do you need accurate and reliable IDS / IPS / AV detection rules? Get in-depth vulnerability details: http://secunia.com/binary_analysis/sample_analysis/ ---------------------------------------------------------------------- TITLE: Cisco IOS Multiple Vulnerabilities SECUNIA ADVISORY ID: SA31990 VERIFY ADVISORY: http://secunia.com/advisories/31990/ CRITICAL: Moderately critical IMPACT: Exposure of sensitive information, DoS, System access WHERE: >From remote OPERATING SYSTEM: Cisco IOS R12.x http://secunia.com/advisories/product/50/ Cisco IOS 12.x http://secunia.com/advisories/product/182/ DESCRIPTION: Some vulnerabilities have been reported in Cisco IOS, which can be exploited by malicious people to disclose sensitive information, cause a DoS (Denial of Service), or to compromise a vulnerable system. 1) An unspecified error exists in the processing of SSL packets during the termination of an SSL session, which can potentially be exploited to crash an affected system. 2) Two unspecified errors exist within the processing of Protocol Independent Multicast (PIM) packets, which can be exploited to cause an affected device to reload. 3) Unspecified errors within the processing of segmented Skinny Call Control Protocol (SCCP) messages can be exploited to cause a Cisco IOS device to reload. Successful exploitation requires that the device is configured with Network Address Translation (NAT) SCCP Fragmentation Support. 4) A memory leak in the processing of Session Initiation Protocol (SIP) messages can be exploited to cause a DoS for all voice services. 6) An unspecified error in the IOS Intrusion Prevention System (IPS) feature when processing certain IPS signatures that use the SERVICE.DNS engine can be exploited to cause a DoS via specially crafted network traffic. 7) A security issue exists in the processing of extended communities with Multi Protocol Label Switching (MPLS) Virtual Private Networks (VPN), which can lead to traffic leaking from one MPLS VPN to another. NOTE: This security issue was introduced with CSCee83237. 8) An unspecified error within the Multi Protocol Label Switching (MPLS) Forwarding Infrastructure (MFI) can be exploited to cause a DoS via specially crafted network packets. Successful exploitation requires access to the MPLS network. 10) An unspecified error in the processing of Layer 2 Tunneling Protocol (L2TP) packets can be exploited to cause an affected device to reload via a specially crafted L2TP packets. Successful exploitation requires that the L2TP mgmt daemon process is running. This process may be enabled e.g. via Layer 2 virtual private networks (L2VPN), Layer 2 Tunnel Protocol Version 3 (L2TPv3), Stack Group Bidding Protocol (SGBP), or Cisco Virtual Private Dial-Up Networks (VPDN). 11) An unspecified error exists in the processing of IPC messages. This can be exploited to reload an affected device via a specially crafted UDP packet sent to port 1975. 12) A security issue is caused due to the device automatically enabling SNMP with a default community string, which can be exploited to gain control an affected system. SOLUTION: Update to the fixed version (please see the vendor's advisories for details). PROVIDED AND/OR DISCOVERED BY: Reported by the vendor. ORIGINAL ADVISORY: Cisco: http://www.cisco.com/warp/public/707/cisco-sa-20080924-ssl.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-multicast.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-sccp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosips.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-vpn.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-mfi.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-iosfw.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-l2tp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-ipc.shtml http://www.cisco.com/warp/public/707/cisco-sa-20080924-ubr.shtml ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities. 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AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

input validation error

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Cisco Security bulletin

SOURCES

LAST UPDATE DATE

2025-04-10T22:56:57.897000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE