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Cisco Security Advisory

Linux Kernel IP Fragment Reassembly Denial of Service Vulnerability Affecting Cisco Products: August 2018

High
Advisory ID:
cisco-sa-20180824-linux-ip-fragment
First Published:
2018 August 24 21:30 GMT
Last Updated:
2019 February 18 16:35 GMT
Version 1.16:
Final
Workarounds:
Yes
CVE-2018-5391
CWE-400
CVE-2018-5391
CWE-400

Summary

  • On August 14, 2018, the Vulnerability Coordination team of the National Cyber Security Centre of Finland (NCSC-FI) and the CERT Coordination Center (CERT/CC) disclosed a vulnerability in the IP stack that is used by the Linux Kernel. This vulnerability is publicly known as FragmentSmack.

    The vulnerability could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. An attack could be executed by an attacker who can submit a stream of fragmented IPv4 or IPv6 packets that are designed to trigger the issue on an affected device.

    The vulnerability is due to inefficient IPv4 and IPv6 fragment reassembly algorithms in the IP stack that is used by the affected kernel. Linux Kernel Versions 3.9 and later are known to be affected by this vulnerability.

    This advisory is available at the following link:
    https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-ip-fragment

Affected Products

  • Cisco investigated its product line to determine which products and services may be affected by this vulnerability.

    The “Vulnerable Products” section of this advisory includes Cisco bug IDs for each affected product or service. The bugs are accessible through the Cisco Bug Search Tool and contain additional platform-specific information, including workarounds (if available) and fixed software releases.

    Any product or service not listed in the “Products Under Investigation” or “Vulnerable Products” section of this advisory is to be considered not vulnerable.

    Vulnerable Products

    The following table lists Cisco products that are affected by the vulnerability that is described in this advisory:

    Product Cisco Bug ID Fixed Release Availability
    Collaboration and Social Media
    Cisco SocialMiner CSCvk78929 Consult the Cisco bug ID for details
    Network Application, Service, and Acceleration
    Cisco Cloud Services Platform 2100 CSCvm15451 2.4.0 (Jan-2019)
    Cisco Tetration Analytics CSCvm15463 3.2 (Mar-2019)
    Cisco vEdge 100 Series Routers CSCvm15501 18.3.3 (Oct-2018)
    18.4.0 (Nov-2018)
    Cisco vEdge 1000 Series Routers CSCvm15501 18.3.3 (Oct-2018)
    18.4.0 (Nov-2018)
    Cisco vEdge 2000 Series Routers CSCvm15501 18.3.3 (Oct-2018)
    18.4.0 (Nov-2018)
    Cisco vEdge 5000 Series Routers CSCvm15501 18.3.3 (Oct-2018)
    18.4.0 (Nov-2018)
    Cisco vEdge Cloud Router Platform CSCvm15501 18.3.3 (Oct-2018)
    18.4.0 (Nov-2018)
    Network and Content Security Devices
    Cisco AMP Virtual Private Cloud Appliance CSCvm56669 Consult the Cisco bug ID for details
    Cisco FireSIGHT System Software CSCvm10968 6.2.3.9 (Jan-2019)
    6.3.0 (Dec-2018)
    Cisco Firepower Management Center CSCvm10968 6.2.3.9 (Jan-2019)
    6.3.0 (Dec-2018)
    Cisco Firepower Threat Defense (FTD) Software CSCvm05464 6.2.3.6 (Oct-2018)
    6.2.2.5 (Nov-2018)
    6.2.0.7 (Dec-2018)
    6.2.3-99 (FTD Virtual for the Microsoft Azure Cloud - Available)
    Cisco Firepower eXtensible Operating System (FXOS) Software CSCvm21278 2.4.1 (Oct-2018)
    Cisco Identity Services Engine (ISE) CSCvm15495 Consult the Cisco bug ID for details
    Cisco Secure Access Control System (ACS) CSCvm09119 No fix expected - End of life
    Cisco Threat Grid Appliance CSCvm15448 2.5 (Sep-2018)
    Cisco Umbrella Virtual Appliance CSCvm15497 v2.3 (Oct-2018)
    Network Management and Provisioning
    Cisco CloudCenter CSCvm40406 4.10.0.1 (Nov-2018)
    Cisco Common Services Platform Collector CSCvm59990 CSPC 2.8.0.1 (Nov-2018)
    CSPC 2.7.4.4 (Nov-2018)
    Cisco Elastic Service Controller (ESC) CSCvm15475 Contact the Cisco TAC for remediation options
    Cisco Enterprise Service Automation CSCvm15467 No fix expected - End of life
    Cisco Evolved Programmable Network Manager CSCvm18160 Consult the Cisco bug ID for details
    Cisco Meeting Server CSCvm15488 2.5 (Dec-2018)
    Cisco Network Analysis Module CSCvm15477 6.4(2) (Jan-2019)
    Cisco Policy Suite CSCvm15802 Consult the Cisco bug ID for details
    Cisco Prime Collaboration Assurance CSCvm15480 11.6 es19 (Oct-2018)
    12.1 sp2 (Oct-2018)
    Cisco Prime Collaboration Deployment CSCvm15504 12.5(1) (Dec-2018)
    Cisco Prime Collaboration Provisioning CSCvm15479 12.6 (Nov-2018)
    Cisco Prime Infrastructure CSCvm15478 Consult the Cisco bug ID for details
    Cisco Prime Network Registrar Virtual Appliance CSCvm15471 10.0.1 (Mar-2019)
    Cisco Prime Service Catalog Virtual Appliance CSCvm15492 Consult the Cisco bug ID for details
    Cisco Virtual Topology System - Virtual Topology Controller (VTC) VM CSCvm21613 2.6.2 (Sep-2018)
    Cisco Virtual Topology System - Virtual Topology Forwarder (VTF) VM CSCvm21614 Consult the Cisco bug ID for details
    Routing and Switching - Enterprise and Service Provider
    Cisco ACI Virtual Edge CSCvm15456 2.1(1a) (Sep-2018)
    Cisco Application Policy Infrastructure Controller (APIC) - Enterprise Module CSCvm15473 Consult the Cisco bug ID for details
    Cisco Application Policy Infrastructure Controller (APIC) CSCvm15454 4.0 (Oct-2018)
    3.2.4 (Nov-2018)
    Cisco DNA Center CSCvm15474 1.3 (Apr-2019)
    Cisco IOS XE Software CSCvm09121 16.10.1 (Oct-2018)
    16.9.2 (Oct-2018)
    16.6.5 (Dec-2018)
    16.3.8 (Jan-2019)
    Cisco IOx Fog Director CSCvm15498 FD-1.8.0 (Feb-2019)
    Cisco MDS 9000 Series Multilayer Switches CSCvm15459 Consult the Cisco bug ID for details
    Cisco Network Assurance Engine CSCvm15450 3.0(0) (Nov-2018)
    Cisco Nexus 3000 Series Switches CSCvm09117 9.2(2) (Nov-2018)
    Cisco Nexus 7000 Series Switches CSCvm15461 Consult the Cisco bug ID for details
    Cisco Nexus 9000 Series Fabric Switches - ACI mode CSCvm15457 14.0 (Oct-2018)
    13.2.4 (Nov-2018)
    Cisco Nexus 9000 Series Switches - Standalone, NX-OS mode CSCvm09117 9.2(2) (Nov-2018)
    Unified Computing
    Cisco Enterprise NFV Infrastructure Software (NFVIS) CSCvn69988 3.11.1 (Mar-2019)
    Cisco HyperFlex System CSCvm15800 3.5(1a) (Oct-2018)
    Cisco UCS B-Series M5 Blade Servers - Integrated Management Controller CSCvm18261 Consult the Cisco bug ID for details
    Cisco UCS Standalone C-Series M5 Rack Server - Integrated Management Controller CSCvm15466 4.0(2a) (Nov-2018)
    3.1(3i) (Nov-2018)
    Voice and Unified Communications Devices
    Cisco Emergency Responder CSCvm15507 12.5(1) (Dec-2018)
    Cisco Finesse CSCvk78931 Consult the Cisco bug ID for details
    Cisco IP Phone 7800 Series with Multiplatform Firmware CSCvm24442 11.2.3 (Jan-2019)
    Cisco IP Phone 7800 Series CSCvm15510 12.5 (Nov-2018)
    Cisco IP Phone 7832 with Multiplatform Firmware CSCvm24440 11.2.3 (Jan-2019)
    Cisco IP Phone 8800 Series with Multiplatform Firmware CSCvm24436 11.2.3 (Jan-2019)
    Cisco IP Phone 8800 Series CSCvm21280 12.5 (Nov-2018)
    Cisco MediaSense CSCvk78932 Consult the Cisco bug ID for details
    Cisco Paging Server CSCvm15509 12.5.1 (Nov-2018)
    Cisco Unified Communications Domain Manager CSCvm15505 Consult the Cisco bug ID for details
    Cisco Unified Communications Manager IM & Presence Service (formerly CUPS) CSCvm15508 12.5(1) (Dec-2018)
    Cisco Unified Communications Manager Session Management Edition CSCvm15503 12.5(1) (Dec-2018)
    Cisco Unified Communications Manager CSCvm15503 12.5(1) (Dec-2018)
    Cisco Unified Contact Center Enterprise - Live Data server CSCvk78928 Consult the Cisco bug ID for details
    Cisco Unified Contact Center Express CSCvm15506 Consult the Cisco bug ID for details
    Cisco Unified Intelligence Center CSCvk78927 Consult the Cisco bug ID for details
    Cisco Unity Connection CSCvm15803 12.5(1) (Dec-2018)
    Cisco Virtualized Voice Browser CSCvk78933 Consult the Cisco bug ID for details
    Cisco Webex Hybrid Data Security Node CSCvm49452 Cisco will update affected systems (Nov-2018)
    Cisco Webex Meetings Server CSCvm44844 2.8 MR3 (Nov-2018)
    Cisco Webex Video Mesh Node CSCvm44845 Cisco will update affected systems (Nov-2018)
    Video, Streaming, TelePresence, and Transcoding Devices
    Cisco Expressway Series CSCvm15491 x12.5 (Jan-2019)
    Cisco Meeting Management CSCvm15483 Consult the Cisco bug ID for details
    Cisco TelePresence Conductor CSCvm15486 Consult the Cisco bug ID for details
    Cisco TelePresence Integrator C Series CSCvm15489 TC7.3.15 (Sep-2018)
    Cisco TelePresence MX Series CSCvm15489 TC7.3.15 (Sep-2018)
    CE9.5.0 (Sep-2018)
    Cisco TelePresence Profile Series CSCvm15489 TC7.3.15 (Sep-2018)
    Cisco TelePresence SX80 Codec CSCvm15489 TC7.3.15 (Sep-2018)
    CE9.5.0 (Sep-2018)
    Cisco TelePresence Server on Virtual Machine CSCvm15490 Consult the Cisco bug ID for details
    Cisco TelePresence System EX Series CSCvm15489 TC7.3.15 (Sep-2018)
    Cisco TelePresence Video Communication Server (VCS) CSCvm15491 x12.5 (Jan-2019)
    Cisco Video Surveillance 8000 Series IP Cameras CSCvm15494 1.0.5-3 (Oct-2018)
    Cisco Webex Room Kit CSCvm15489 CE9.5.0 (Sep-2018)
    Wireless
    Cisco Aironet 1560 Series Access Points CSCvm15469 8.5 MR4 (Oct-2018)
    8.8 MR1 (Oct-2018)
    8.9 (Feb-2019)
    Cisco Aironet 1815 Series Access Points CSCvm15469 8.5 MR4 (Oct-2018)
    8.8 MR1 (Oct-2018)
    8.9 (Feb-2019)
    Cisco Aironet 2800 Series Access Points CSCvm15469 8.5 MR4 (Oct-2018)
    8.8 MR1 (Oct-2018)
    8.9 (Feb-2019)
    Cisco Aironet 3800 Series Access Points CSCvm15469 8.5 MR4 (Oct-2018)
    8.8 MR1 (Oct-2018)
    8.9 (Feb-2019)
    Cisco Mobility Services Engine CSCvm15476 CMX 10.6 (Jan-2019)
    Cisco Wireless LAN Controller (WLC 5520, WLC 8540, WLC 3504, Virtual Wireless Controller) CSCvm76255 Consult the Cisco bug ID for details

    Products Confirmed Not Vulnerable

    Only products and services listed in the “Vulnerable Products” section of this advisory are known to be affected by this vulnerability.

    Cisco has confirmed that this vulnerability does not affect the following products and services.

    Network and Content Security Devices
    • Cisco Adaptive Security Appliance (ASA) Software
    • Cisco Adaptive Security Virtual Appliance (ASAv)

    Network Management and Provisioning
    • Cisco Prime Optical

    Routing and Switching - Enterprise and Service Provider
    • Cisco ASR 5000 Series Routers
    • Cisco IOS XRv 9000 Router, Cisco ASR 9000 Series Aggregation Services Routers - Running Cisco IOS XR 64-bit (eXR) Software
    • Cisco Network Convergence System 1000 Series Routers
    • Cisco Network Convergence System 5000 Series Routers
    • Cisco Network Convergence System 5500 Series Routers
    • Cisco Network Convergence System 6000 Series Routers
    • Cisco Nexus 1000V Series Switches

    Unified Computing
    • Cisco UCS Fabric Interconnects

    Voice and Unified Communications Devices
    • Cisco IP Phone 8845 with Multiplatform Firmware
    • Cisco IP Phone 8865 with Multiplatform Firmware
    • Cisco Unified IP 8831 Conference Phone for Third-Party Call Control
    • Cisco Wireless IP Phone 8821

    Wireless
    • Cisco Aironet 1810 Series OfficeExtend Access Points
    • Cisco Aironet 1810w Series Access Points
    • Cisco Aironet 1830 Series Access Points
    • Cisco Aironet 1850 Series Access Points

Workarounds

  • Any workarounds will be documented in product-specific Cisco bugs, which are identified in the “Vulnerable Products” section of this advisory.

    In many cases, platform-dependent workarounds may be available. Administrators may be able to leverage access control lists (ACLs), Control Plane Policing (CoPP), or other rate limiting measures to control the flow of fragmented packets that reach an affected interface. Off-device mitigations, such as external firewalls or infrastructure ACLs on edge devices, may also effectively control the flow of IP fragments that are directed to management interfaces or control planes of downstream affected devices.

Fixed Software

  • For information about fixed software releases, consult the Cisco bugs identified in the “Vulnerable Products” section of this advisory.

    When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, 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 TAC or their contracted maintenance providers.

Exploitation and Public Announcements

  • The Cisco Product Security Incident Response Team (PSIRT) is not aware of any malicious use of the vulnerability that is described in this advisory.

Source

  • This vulnerability was reported by Juha-Matti Tilli, of the Aalto University Department of Communications and Networking, and Nokia Bell Labs.

Cisco Security Vulnerability Policy

  • To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

Subscribe to Cisco Security Notifications

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Revision History

  • Version Description Section Status Date
    1.16 Updated information about fixed release availability for Cisco FireSIGHT System Software, Cisco Firepower Management Center, and Cisco Enterprise NFV Infrastructure Software (NFVIS). Vulnerable Products Final 2019-February-18
    1.15 Updated information about fixed release availability. Removed references to ongoing investigation. Summary, Affected Products, Vulnerable Products Final 2018-November-06
    1.14 Updated information about fixed release availability. Vulnerable Products Interim 2018-October-25
    1.13 Updated information about fixed release availability. Vulnerable Products Interim 2018-October-19
    1.12 Updated information about fixed release availability. Vulnerable Products Interim 2018-October-11
    1.11 Updated the lists of products under investigation and vulnerable products. Updated information about fixed release availability. Affected Products, Vulnerable Products Interim 2018-October-04
    1.10 Updated information about fixed release availability. Vulnerable Products Interim 2018-September-27
    1.9 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Updated information about fixed release availability. Affected Products, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2018-September-24
    1.8 Updated the lists of products under investigation and vulnerable products. Affected Products, Vulnerable Products Interim 2018-September-17
    1.7 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Updated information about fixed release availability. Affected Products, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2018-September-13
    1.6 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Updated information about fixed release availability. Affected Products, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2018-September-10
    1.5 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Updated information about fixed release availability. Affected Products, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2018-September-06
    1.4 Updated the lists of products under investigation and vulnerable products. Affected Products, Vulnerable Products Interim 2018-September-04
    1.3 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Updated information about fixed release availability. Affected Products, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2018-August-30
    1.2 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Updated information about fixed release availability. Affected Products, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2018-August-29
    1.1 Updated the lists of products under investigation, vulnerable products, and products confirmed not vulnerable. Affected Products, Vulnerable Products, Products Confirmed Not Vulnerable Interim 2018-August-28
    1.0 Initial public release. - Interim 2018-August-24
    Show Less

Cisco Security Vulnerability Policy

  • To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

Subscribe to Cisco Security Notifications

Related to This Advisory