ID

VAR-200903-0277

CVE

CVE-2009-0634

TITLE

Cisco IOS of Mobile IP NAT Traversal Function and Mobile IPv6 Subsystem Home Agent (HA) Service disruption in implementation (DoS) Vulnerabilities

DESCRIPTION

Multiple unspecified vulnerabilities in the home agent (HA) implementation in the (1) Mobile IP NAT Traversal feature and (2) Mobile IPv6 subsystem in Cisco IOS 12.3 through 12.4 allow remote attackers to cause a denial of service (input queue wedge and interface outage) via an ICMP packet, aka Bug ID CSCso05337. This vulnerability Bug ID : CSCso05337 Vulnerabilities. Cisco IOS is prone to multiple remote denial-of-service vulnerabilities. Successfully exploiting these issues allows remote attackers to crash the targeted device, denying service to legitimate users. These issues are tracked by Cisco Bug IDs CSCsm97220 and CSCso05337. This vulnerability can only be successfully exploited when the attack packet must be explicitly sent to the router instead of an intermediate packet. Cisco has released free software updates that address these vulnerabilities. This advisory is posted at the following link http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml Note: The March 25, 2009, Cisco IOS Security Advisory bundled publication includes eight Security Advisories. Each advisory lists the releases that correct the vulnerability or vulnerabilities in the advisory. The following table lists releases that correct all Cisco IOS Software vulnerabilities that have been published in Cisco Security Advisories on March 25, 2009, or earlier. 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 12.3(26) with an installed image name of C2500-IS-L: Router#show version Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2008 by cisco Systems, Inc. Compiled Mon 17-Mar-08 14:39 by dchih !--- output truncated The following example identifies a Cisco product that is running Cisco IOS Software Release 12.4(20)T with an installed image name of C1841-ADVENTERPRISEK9-M: Router#show version Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2008 by Cisco Systems, Inc. Compiled Thu 10-Jul-08 20:25 by prod_rel_team !--- output truncated Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link: http://www.cisco.com/warp/public/620/1.html Products Confirmed Not Vulnerable +-------------------------------- Cisco IOS XR is not affected by these vulnerabilities. No other Cisco products are currently known to be affected by these vulnerabilities. Details ======= Mobile IP is part of both IPv4 and IPv6 standards. Mobile IP allows a host device to be identified by a single IP address even though the device may move its physical point of attachment from one network to another. Regardless of movement between different networks, connectivity at the different points is achieved seamlessly without user intervention. Roaming from a wired network to a wireless or wide-area network is also possible. More information on Mobile IPv6 can be found at the following link: http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-mobile.html The Mobile IP Support NAT Traversal feature is documented in RFC 3519. It introduces an alternative method for tunneling Mobile IP data traffic. New extensions in the Mobile IP registration request and reply messages have been added for establishing User Datagram Protocol (UDP) tunneling. This feature allows mobile devices in collocated mode that use a private IP address (RFC 1918) or foreign agents (FAs) that use a private IP address for the care-of address (CoA) to establish a tunnel and traverse a NAT-enabled router with mobile node (MN) data traffic from the home agent (HA). A successful exploitation of this vulnerability could cause an interface to stop processing traffic until the system is restarted. Offending packets need to be destined to the router for a successful exploit. Vulnerability Scoring Details ============================= Cisco has provided scores for the vulnerabilities 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 CSCsm97220 - Input queue wedged by MIPv6 packets 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 CSCso05337 - HA: Input queue wedged by ICMP packet CVSS Base Score - 7.1 Access Vector - Network Access Complexity - Medium Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete CVSS Temporal Score - 5.9 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed Impact ====== Successful exploitation of the vulnerability may result in an interface to stop processing traffic, causing a 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. 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 | Availability of Repaired Releases | | Release | | |------------+------------------------------------------------------| | 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 | | | |------------+--------------------------------------+---------------| | 12.3 | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3B | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3BC | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3BW | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3EU | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JEA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JEB | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JEC | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JK | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JL | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JX | Not Vulnerable | | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3T | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.3TPC | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3VA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XB | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XC | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XD | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XE | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XF | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XG | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XI | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XJ | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XK | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XL | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XQ | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XR | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XS | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XU | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XW | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XX | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XY | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XZ | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YD | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YF | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YG | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YH | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YI | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YJ | Not Vulnerable | | |------------+--------------------------------------+---------------| | | Releases prior to 12.3(11)YK3 are | 12.4(22)T1 | | | vulnerable, release 12.3(11)YK3 and | | | 12.3YK | later are not vulnerable; first | 12.4(15)T9; | | | fixed in 12.4T | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.3YM | 12.3(14)YM13 | 12.3(14)YM13 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3YQ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3YS | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3YT | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3YU | Vulnerable; migrate to 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | Releases prior to 12.3(14)YX10 are | | | 12.3YX | vulnerable, release 12.3(14)YX10 and | 12.3(14)YX14 | | | later are not vulnerable; | | |------------+--------------------------------------+---------------| | 12.3YZ | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3ZA | Not Vulnerable | | |------------+--------------------------------------+---------------| | Affected | | Recommended | | 12.4-Based | First Fixed Release | Release | | Releases | | | |------------+--------------------------------------+---------------| | | | 12.4(18e) | | | 12.4(18e) | | | 12.4 | | 12.4(23a); | | | 12.4(23a); Available on 30-APR-2009 | Available on | | | | 30-APR-2009 | |------------+--------------------------------------+---------------| | 12.4JA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JDA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JK | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JL | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JMA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JMB | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JX | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4MD | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4MR | 12.4(19)MR | 12.4(19)MR2 | |------------+--------------------------------------+---------------| | 12.4SW | Not Vulnerable | | |------------+--------------------------------------+---------------| | | 12.4(20)T | 12.4(22)T1 | | | | | | 12.4T | 12.4(15)T8 | 12.4(15)T9; | | | | Available on | | | 12.4(15)T9; Available on 29-APR-2009 | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XA | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | 12.4(15)T8 | 12.4(22)T1 | | | | | | 12.4XB | 12.4(20)T | 12.4(15)T9; | | | | Available on | | | 12.4(15)T9; Available on 29-APR-2009 | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XC | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | 12.4(4)XD12; Available on | 12.4(4)XD12; | | 12.4XD | 27-MAR-2009 | Available on | | | | 27-MAR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XE | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XF | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XG | Not Vulnerable | | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XJ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XK | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4XL | 12.4(15)XL4 | 12.4(15)XL4 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XM | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XN | Vulnerable; contact TAC | | |------------+--------------------------------------+---------------| | 12.4XP | Vulnerable; contact TAC | | |------------+--------------------------------------+---------------| | 12.4XQ | 12.4(15)XQ2 | 12.4(15)XQ2 | |------------+--------------------------------------+---------------| | 12.4XR | 12.4(15)XR4 | 12.4(22)T1 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XT | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XV | Vulnerable; contact TAC | | |------------+--------------------------------------+---------------| | 12.4XW | 12.4(11)XW10 | 12.4(11)XW10 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XY | 12.4(15)XY4 | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XZ | 12.4(15)XZ1 | 12.4(15)XZ2 | |------------+--------------------------------------+---------------| | 12.4YA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4YB | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4YD | Not Vulnerable | | +-------------------------------------------------------------------+ Workarounds =========== The following mitigation and identification methods have been identified for these vulnerabilities: Infrastructure Access Control Lists +---------------------------------- Although it is often difficult to block traffic that transits a network, it is possible to identify traffic that should never be allowed to target infrastructure devices and block that traffic at the border of networks. Infrastructure Access Control Lists (iACLs) are a network security best practice and should be considered as a long-term addition to good network security as well as a workaround for these specific vulnerabilities. The iACL example below should be included as part of the deployed infrastructure access-list which will protect all devices with IP addresses in the infrastructure IP address range: IPv4 example: !--- Anti-spoofing entries are shown here. !--- Deny special-use address sources. !--- Refer to RFC 3330 for additional special use addresses. access-list 110 deny ip host 0.0.0.0 any access-list 110 deny ip 127.0.0.0 0.255.255.255 any access-list 110 deny ip 192.0.2.0 0.0.0.255 any access-list 110 deny ip 224.0.0.0 31.255.255.255 any !--- Filter RFC 1918 space. access-list 110 deny ip 10.0.0.0 0.255.255.255 any access-list 110 deny ip 172.16.0.0 0.15.255.255 any access-list 110 deny ip 192.168.0.0 0.0.255.255 any !--- Deny your space as source from entering your AS. !--- Deploy only at the AS edge. access-list 110 deny ip YOUR_CIDR_BLOCK any !--- Permit BGP. access-list 110 permit tcp host bgp_peer host router_ip eq bgp access-list 110 permit tcp host bgp_peer eq bgp host router_ip !--- Deny access to internal infrastructure addresses. access-list 110 deny ip any INTERNAL_INFRASTRUCTURE_ADDRESSES !--- Permit transit traffic. access-list 110 permit ip any any IPv6 example: !--- Configure the access-list. ipv6 access-list iacl !--- Deny your space as source from entering your AS. !--- Deploy only at the AS edge. deny ipv6 YOUR_CIDR_BLOCK_IPV6 any !--- Permit multiprotocol BGP. permit tcp host bgp_peer_ipv6 host router_ipv6 eq bgp permit tcp host bgp_peer_ipv6 eq bgp host router_ipv6 !--- Deny access to internal infrastructure addresses. deny ipv6 any INTERNAL_INFRASTRUCTURE_ADDRESSES_IPV6 !--- Permit transit traffic. permit ipv6 any any The white paper entitled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection access lists. This white paper can be obtained at the following link http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml Cisco IOS Embedded Event Manager +------------------------------- It is possible to detect blocked interface queues with a Cisco IOS Embedded Event Manager (EEM) policy. EEM provides event detection and reaction capabilities on a Cisco IOS device. EEM can alert administrators of blocked interfaces with email, a syslog message, or a Simple Network Management Protocol (SNMP) trap. A sample EEM policy that uses syslog to alert administrators of blocked interfaces is available at Cisco Beyond, an online community dedicated to EEM. A sample script is available at the following link: http://forums.cisco.com/eforum/servlet/EEM?page=eem&fn=script&scriptId=981 More information about EEM is available from Cisco.com at the following link: http://www.cisco.com/en/US/products/ps6815/products_ios_protocol_group_home.html Obtaining Fixed Software ======================== Cisco has released free software updates that address these vulnerabilities. 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 ===================================== The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory. This vulnerability was reported to Cisco by a customer. 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-20090325-mobileip.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 | 2009-Mar-25 | 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) iEYEARECAAYFAknKUa8ACgkQ86n/Gc8U/uBD0ACfYblb5Nscx1zIWMLeihiaZAe7 TtsAoIGgf8/ubiolVwSDmu/tCTgH8skm =YxAj -----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/ . ---------------------------------------------------------------------- Secunia is pleased to announce the release of the annual Secunia report for 2008. Highlights from the 2008 report: * Vulnerability Research * Software Inspection Results * Secunia Research Highlights * Secunia Advisory Statistics Request the full 2008 Report here: http://secunia.com/advisories/try_vi/request_2008_report/ Stay Secure, Secunia ---------------------------------------------------------------------- TITLE: Cisco IOS Multiple Vulnerabilities SECUNIA ADVISORY ID: SA34438 VERIFY ADVISORY: http://secunia.com/advisories/34438/ DESCRIPTION: Some vulnerabilities have been reported in Cisco IOS, which can be exploited by malicious users to gain escalated privileges and by malicious people to cause a DoS (Denial of Service). 1) An unspecified error in the Cisco Tunneling Control Protocol (cTCP) feature can be exploited to exhaust all memory and may crash the cTCP server via a series of specially crafted TCP packets. This vulnerability is reported in Cisco IOS versions 12.4(9)T or later, which are configured for Cisco Tunneling Control Protocol (cTCP) encapsulation (disabled by default) for EZVPN server. 2) An unspecified error exists in the handling of IP sockets, which can be exploited to prevent accepting new connections or sessions, exhaust memory, cause high CPU load, or to cause a reload of an affected device. Successful exploitation of this vulnerability requires a complete TCP three-way handshake to an associated TCP port. 4) An unspecified error in the Cisco IOS SCP server (disabled by default) can be exploited to retrieve or write to arbitrary files on the device's file system, regardless of the CLI view configuration. 5) An unspecified error in the implementation of the Session Initiation Protocol (SIP) can be exploited to reload an affected device via a specially crafted SIP message. This vulnerability is reported in Cisco IOS with SIP voice services enabled, and which process SIP messages as part of configured VoIP functionality. 6) An unspecified error in the handling of TCP packets can be exploited to reload an affected device via a sequence of specially crafted TCP packets. Successful exploitation of this vulnerability requires a complete TCP three-way handshake to an associated TCP port. This vulnerability is reported in Cisco IOS with the following features enabled: * Airline Product Set (ALPS) * Serial Tunnel Code (STUN) and Block Serial Tunnel Code (BSTUN) * Native Client Interface Architecture support (NCIA) * Data-link switching (DLSw) * Remote Source-Route Bridging (RSRB) * Point to Point Tunneling Protocol (PPTP) * X.25 for Record Boundary Preservation (RBP) * X.25 over TCP (XOT) * X.25 Routing 7) An unspecified error in the handling of UDP packets can be exploited to block an interface of an affected device by sending a specially crafted UDP packets. SOLUTION: Please see the following vendor advisory for fixed versions. http://www.cisco.com/warp/public/707/cisco-sa-20090325-bundle.shtml PROVIDED AND/OR DISCOVERED BY: 1, 3, 5 - 9) Reported by the vendor. 2) The vendor also credits Jens Link. 4) The vendor credits Kevin Graham. ORIGINAL ADVISORY: Cisco: http://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml OTHER REFERENCES: http://www.cisco.com/warp/public/707/cisco-amb-20090325-sip-and-udp.shtml http://www.cisco.com/warp/public/707/cisco-amb-20090325-ctcp.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

lack of information

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Cisco Security bulletin

SOURCES

LAST UPDATE DATE

2024-11-23T21:56:38.979000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE