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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-ip-fragment
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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-ip-fragment
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.
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 |
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.
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.
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.
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any malicious use of the vulnerability that is described in this advisory.
This vulnerability was reported by Juha-Matti Tilli, of the Aalto University Department of Communications and Networking, and Nokia Bell Labs.
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.
| 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 |
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