ID

VAR-201202-0095

CVE

CVE-2012-0352

TITLE

plural Cisco Nexus Switch Cisco NX-OS Service disruption in (DoS) Vulnerabilities

DESCRIPTION

Cisco NX-OS 4.2.x before 4.2(1)SV1(5.1) on Nexus 1000v series switches; 4.x and 5.0.x before 5.0(2)N1(1) on Nexus 5000 series switches; and 4.2.x before 4.2.8, 5.0.x before 5.0.5, and 5.1.x before 5.1.1 on Nexus 7000 series switches allows remote attackers to cause a denial of service (netstack process crash and device reload) via a malformed IP packet, aka Bug IDs CSCti23447, CSCti49507, and CSCtj01991. The problem is Bug ID CSCti23447 , CSCti49507 ,and CSCtj01991 It is a problem.Malformed by a third party IP Service disruption via packets (NetStack Process crash and device reload ) There is a possibility of being put into a state. Adopt the Cisco Nexus OS operating system. Cisco NX-OS software is affected by this vulnerability when the operating system IP stack processes malformed IP packets and obtains Layer 4 (UDP or TCP) information from the packets, which can cause the Cisco Nexus 1000v, 5000 to run software affected by this vulnerability. And 7000 series switches are overloaded. An attacker can exploit this issue to cause the device to crash, denying service to legitimate users. The Cisco Nexus family consists of a comprehensive switch offering that enables customers to gradually and cost-effectively migrate to 10 Gigabit Ethernet and unified data center fabrics. ---------------------------------------------------------------------- Secunia presentations @ RSA Conference 2012, San Francisco, USA, 27 Feb-02 March Listen to our Chief Security Specialist, Research Analyst Director, and Director Product Management & Quality Assurance discuss the industry's key topics. Also, visit the Secunia stand #817. SOLUTION: Upgrade to version 5.x. PROVIDED AND/OR DISCOVERED BY: Reported by the vendor. ORIGINAL ADVISORY: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120215-nxos OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ DEEP LINKS: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ EXPLOIT: Further details available in Customer Area: http://secunia.com/vulnerability_intelligence/ ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help private users keeping their systems up to date against the latest vulnerabilities. Subscribe: http://secunia.com/advisories/secunia_security_advisories/ Definitions: (Criticality, Where etc.) http://secunia.com/advisories/about_secunia_advisories/ Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor. Cisco has released free software updates that address this vulnerability. Cisco NX-OS Software versions prior to the First Fixed Release version are affected. Refer to the Software Versions and Fixes section for details regarding fixed versions. To determine the version of Cisco NX-OS Software that is running on a Cisco Nexus switch, administrators can log in to the device and issue the "show version" command to display the system banner. The following example shows how to display the version information for the kickstart and system image that is running on a device that runs Cisco NX-OS Release 5.1(3): switch# show version Cisco Nexus Operating System (NX-OS) Software TAC support: http://www.cisco.com/tac Documents: http://www.cisco.com/en/US/products/ps9372/tsd_products_support_series_home.html Copyright (c) 2002-2011, Cisco Systems, Inc. All rights reserved. The copyrights to certain works contained in this software are owned by other third parties and used and distributed under license. Certain components of this software are licensed under the GNU General Public License (GPL) version 2.0 or the GNU Lesser General Public License (LGPL) Version 2.1. A copy of each such license is available at http://www.opensource.org/licenses/gpl-2.0.php and http://www.opensource.org/licenses/lgpl-2.1.php Software BIOS: version 3.22.0 kickstart: version 5.1(3) system: version 5.1(3) [...] Products Confirmed Not Vulnerable +-------------------------------- Cisco NX-OS Software for products other than the Cisco Nexus 1000v, 5000, and 7000 Series Switches is not affected by this vulnerability. In this case, an ICMP error message (time exceeded) needs to be generated. During generation of this ICMP message, the bug could be triggered. * Policy-based routing is in use, and to make a routing decision, an incoming packet needs to be parsed. If the packet is a malformed TCP segment and the routing policy uses TCP information for routing decisions, then this bug could be triggered. * An egress Access Control List (ACL) is applied to an interface and a malformed IP packet that needs to be forwarded through that interface is received. Note: This list is not exhaustive. It contains some of the scenarios that have been confirmed to trigger the vulnerability described in this document. Both through-the-device (transit) traffic and to-the-device traffic may trigger this vulnerability. When a system reloads because of this vulnerability, a process called "netstack" will terminate unexpectedly, and the following message will be recorded to the system log: 2012 Feb 02 20:32:15 NX-7010 %SYSMGR-2-SERVICE_CRASHED: Service "netstack" (PID 4335) hasn't caught signal 11 (core will be saved). The fix was completed with CSCti49507. The CVSS scoring in this security advisory is in accordance with CVSS version 2.0. CVSS is a standards-based scoring method that conveys vulnerability severity and helps organizations determine the urgency and priority of a response. Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks. Cisco has provided additional information regarding CVSS at the following link: http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link: http://intellishield.cisco.com/security/alertmanager/cvss * CSCti23447, CSCti49507, and CSCtj01991 ("Malformed IP packet causes Netstack crash") 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 that is described in this advisory may result in a reload of an affected device. Repeated exploitation could result in a sustained DoS condition. Software Versions and Fixes =========================== When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Each row of the Cisco NX-OS Software table (below) names a Cisco NX-OS Software 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. A device that is 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. Obtaining Fixed Software ======================== Cisco has released free software updates that address the vulnerability|vulnerabilities described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments. Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html, or as set forth 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, upgrades should be obtained through the Software Center on Cisco.com at http://www.cisco.com. Customers Using Third-Party Support Organizations +------------------------------------------------ Customers with Cisco products that 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 organization for assistance with the appropriate course of action. The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed. Customers Without Service Contracts +---------------------------------- Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC): * +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 the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC. Refer to Cisco Worldwide Contacts at http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and e-mail addresses for support in various languages. Exploitation and Public Announcements ===================================== The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. This vulnerability was discovered while working on customer support cases. 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 Security Intelligence Operations at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120215-nxos Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses: * 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 Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates. Revision History ================ +------------------------------------------------------------+ | Revision 1.0 | 2012-February-15 | Initial public release | +------------------------------------------------------------+ Cisco Security Procedures ========================= Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iF4EAREIAAYFAk873DMACgkQQXnnBKKRMNDlegD/aqbq5hFAjAMvDyhCfSw+b3Jv OmNKTgR/ebVWuq32C/QA/iIgbVvGoEsARBgsy5EMT86xItQsIFTI6d9NAOnGptEV =3LfF -----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/

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

resource management error

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Cisco

SOURCES

LAST UPDATE DATE

2024-08-14T15:45:02.193000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE