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             AUSCERT External Security Bulletin Redistribution

          Cisco Aironet 1560, 1800, 2800, and 3800 Series Access
                  Points Denial of Service Vulnerability
                              18 October 2018


        AusCERT Security Bulletin Summary

Product:           Cisco Aironet
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0381  

Original Bulletin: 

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Cisco Aironet 1560, 1800, 2800, and 3800 Series Access Points Denial of Service

Priority:        Medium

Advisory ID:     cisco-sa-20181017-aironet-dos

First Published: 2018 October 17 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:   CSCvh21953



CVSS Score:


  o A vulnerability in the Cisco Aironet 1560, 1800, 2800, and 3800 Series
    Access Points (APs) software could allow an authenticated, adjacent
    attacker to cause an affected device to reload unexpectedly, resulting in
    a denial of service (DoS) condition.

    The vulnerability is due to a deadlock condition that may occur when an
    affected AP attempts to dequeue aggregated traffic that is destined to an
    attacker-controlled wireless client. An attacker who can successfully
    transition between multiple Service Set Identifiers (SSIDs) hosted on the
    same AP while replicating the required traffic patterns could trigger the
    deadlock condition. A watchdog timer that detects the condition will
    trigger a reload of the device, resulting in a DoS condition while the
    device restarts.

    Cisco has released software updates that address this vulnerability.

    This advisory is available at the following link:

Affected Products

  o Vulnerable Products

    This vulnerability affects only Cisco 1560, 1800, 2800, and 3800 Series
    Access Points that are running a vulnerable release of Cisco Mobility
    Express (ME) Software. For information about affected software releases,
    consult the Cisco bug ID(s) at the top of this advisory.

    Determining the Cisco Mobility Express Software Release

    To determine which Cisco Mobility Express Software release is running on a
    device, administrators can use the web interface or the CLI of the device.

    To use the web interface, do the following:

     1. Log in to the web interface
     2. Choose System Software > Software Upgrade
     3. Refer to the value in the System Software Version field

    To use the CLI, log in to the AP through a Telnet or an SSH session, issue
    the show version command, and then refer to the command output. The
    following example shows the command output for a Cisco Aironet 1852i
    Access Point that is running Cisco Mobility Express Software Release

        AP# show version

        cisco AIR-AP1852I-UXK9 ARMv7 Processor rev 0 (v71) with 997184/525160K bytes of memory.

        Processor board ID RFDP2BCR021
        AP Running Image :
        Primary Boot Image :
        Backup Boot Image :
        AP Image type : MOBILITY EXPRESS IMAGE
        AP Configuration : MOBILITY EXPRESS CAPABLE

    Products Confirmed Not Vulnerable

    Only products 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
    Cisco products:

       Small Business 100 Series Access Points
       Small Business 300 Series Access Points
       Small Business 500 Series Access Points
       Aironet 1540 Series Access Points

    Note: The Cisco Aironet 1550 Series Outdoor Access Point was not
    investigated because it has entered the end-of-life process. Refer to the
    End-of-Sale and End-of-Life Announcement for the Cisco Aironet 1550 Series
    Outdoor Access Point for additional information.


  o There are no workarounds that address this vulnerability.

Fixed Software

  o For information about fixed software releases, consult the Cisco bug ID(s)
    at the top 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 Technical Assistance Center (TAC) or their contracted maintenance

Exploitation and Public Announcements

  o 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.


  o This vulnerability was found during resolution of a TAC support case.

Cisco Security Vulnerability Policy

  o 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

  o Subscribe


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181017-aironet-dos

Revision History

    | Version  |        Description        | Section  | Status |       Date       |
    | 1.0      | Initial public release.   | -        | Final  | 2018-October-17  |

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