ESB-2018.1366.2 - UPDATE [Cisco] Cisco Aironet: Multiple vulnerabilities 2018-05-04

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2018.1366.2
  Multiple vulnerabilities have been identified in Cisco Aironet products
                                4 May 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Aironet
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Increased Privileges -- Existing Account      
                   Denial of Service    -- Remote/Unauthenticated
                   Unauthorised Access  -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0250 CVE-2018-0234 CVE-2018-0226

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-aironet-ssh
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-ap-ptp
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-ap-acl
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-aironet-dos

Comment: This bulletin contains four (4) Cisco Systems security advisories.

Revision History:  May 4 2018: Added cisco-sa-20180502-aironet-dos to the composite bulletin
                   May 4 2018: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Aironet 1800, 2800, and 3800 Series Access Points Secure Shell Privilege
Escalation Vulnerability

High
Advisory ID:
cisco-sa-20180502-aironet-ssh
First Published:
2018 May 2 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCva68116
 
CVE-2018-0226
 
CWE-255
 
CVSS Score:
Base 7.5
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
CVE-2018-0226
 
CWE-255
 
Download CVRF
Download PDF
Email

Summary

  o A vulnerability in the assignment and management of default user accounts
    for Secure Shell (SSH) access to Cisco Aironet 1800, 2800, and 3800 Series
    Access Points that are running Cisco Mobility Express Software could allow
    an authenticated, remote attacker to gain elevated privileges on an
    affected access point.

    The vulnerability exists because the Cisco Mobility Express controller of
    the affected software configures the default SSH user account for an access
    point to be the first SSH user account that was created for the Mobility
    Express controller, if an administrator added user accounts directly to the
    controller instead of using the default configuration or the SSH username
    creation wizard. Although the user account has read-only privileges for the
    Mobility Express controller, the account could have administrative
    privileges for an associated access point. An attacker who has valid user
    credentials for an affected controller could exploit this vulnerability by
    using the default SSH user account to authenticate to an affected access
    point via SSH. A successful exploit could allow the attacker to log in to
    the affected access point with administrative privileges and perform
    arbitrary administrative actions.

    Cisco has released software updates that address this vulnerability. There
    are no workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20180502-aironet-ssh

Affected Products

  o Vulnerable Products

    This vulnerability affects the following Cisco products:

      - Aironet 1800 Series Access Points that are running Cisco Mobility
        Express Software Releases 8.2.121.0 through 8.5.105.0
      - Aironet 2800 Series Access Points that are running Cisco Mobility
        Express Software Releases 8.3.102.0 through 8.5.105.0
      - Aironet 3800 Series Access Points that are running Cisco Mobility
        Express Software Releases 8.3.102.0 through 8.5.105.0

    Determining the Software Release

    To determine which Cisco Mobility Express Software release is running on a
    Cisco Mobility Express controller and the associated access points,
    administrators can use the controller's web interface or the access point's
    CLI.

    To use the controller's web interface, do the following:

     1. By using a browser, log in to the web interface.
     2. Choose Management > Software Update.
     3. Refer to the release number that appears at the top of the page.

    To use the access point's CLI, log in to the access point via Telnet or
    SSH, issue the show version command, and then refer to the output of the
    command. The following example shows the output of the command for a
    Cisco Aironet 1852i Access Point that is running Cisco Mobility Express
    Software Release 8.3.111.0:

        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 : 8.3.111.0
        Primary Boot Image : 8.3.111.0
        Backup Boot Image : 8.1.106.33
        AP Image type : MOBILITY EXPRESS IMAGE
        AP Configuration : MOBILITY EXPRESS CAPABLE
        .
        .
        .

    Assessing User Accounts and Privileges

    To display user accounts for a Cisco Mobility Express configuration and
    assess whether an access point may be vulnerable, administrators can log in
    to the Cisco Mobility Express controller, use the show mgmtuser command in
    the CLI, and then refer to the output of the command:

      - If the first user account listed in the output is admin and that
        account has read-write permissions, the access point is not vulnerable.
      - If the first user account listed in the output has read-only
        permissions or is the lobby ambassador admin (lobby-admin) account, the
        access point is vulnerable.

    The following example shows the output of the command for a configuration
    that is not vulnerable:

        (wlc)> show mgmtuser

        User Name     Permissions    Description      Password Strength   Telnet Capable
        -----------   ------------   ---------------  ------------------  ----------
        admin         read-write                      Strong              Yes
        test          read-write                      Strong              Yes


    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 Cisco Aironet
    Access Points that are running Cisco Lightweight Access Point (AP) Software
    or Cisco IOS Software. Cisco has also confirmed that this vulnerability
    does not affect any Cisco Wireless Controller models or Cisco Wireless LAN
    Controller models.

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

  o Cisco has released free software updates that address the vulnerability
    described in this advisory. Customers may only install and expect support
    for software versions and feature sets for which they have purchased a
    license. By installing, downloading, accessing, or otherwise using such
    software upgrades, customers agree to follow the terms of the Cisco
    software license:
    https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

    Additionally, customers may only download software for which they have a
    valid license, procured from Cisco directly, or through a Cisco authorized
    reseller or partner. In most cases this will be a maintenance upgrade to
    software that was previously purchased. Free security software updates do
    not entitle customers to a new software license, additional software
    feature sets, or major revision upgrades.

    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
    providers.

    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 TAC:
    https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

    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.

    Fixed Releases

    Customers should upgrade to an appropriate release as indicated in the
    table in this section. To help ensure a complete upgrade solution, consider
    that this advisory is part of a collection that includes the following
    advisories:

      - cisco-sa-20180502-aironet-ssh: Cisco Aironet 1800, 2800, and 3800
        Series Access Points Secure Shell Privilege Escalation Vulnerability
      - cisco-sa-20180502-ap-ptp: Cisco Aironet 1810, 1830, and 1850 Series
        Access Points Point-to-Point Tunneling Protocol Denial of Service
        Vulnerability
      - cisco-sa-20180502-wlc-ip: Cisco Wireless LAN Controller IP Fragment
        Reassembly Denial of Service Vulnerability
      - cisco-sa-20180502-wlc-mfdos: Cisco Wireless LAN Controller 802.11
        Management Frame Denial of Service Vulnerability

    In the following table, the left column lists major releases of Cisco
    software. The center column indicates whether a major release is affected
    by the vulnerability described in this advisory and the first minor release
    that includes the fix for this vulnerability. The right column indicates
    whether a major release is affected by all the vulnerabilities described in
    this collection of advisories and which release includes fixes for those
    vulnerabilities.

    +--------------------+--------------------+-----------------------------------+
    | Cisco Mobility     | First Fixed        | First Fixed Release for All       |
    | Express Software   | Release for        | Vulnerabilities Described in the  |
    | Major Release      | This Vulnerability | Collection of Advisories          |
    +--------------------+--------------------+-----------------------------------+
    | Prior to 8.0       | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+
    | 8.0                | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+
    | 8.1                | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+
    | 8.2                | 8.5.110.0^1        | 8.5.120.0                         |
    +--------------------+--------------------+-----------------------------------+
    | 8.3                | 8.5.110.0^2        | 8.5.120.0                         |
    +--------------------+--------------------+-----------------------------------+
    | 8.4                | 8.5.110.0          | 8.5.120.0                         |
    +--------------------+--------------------+-----------------------------------+
    | 8.5                | 8.5.110.0          | 8.5.120.0                         |
    +--------------------+--------------------+-----------------------------------+
    | 8.6                | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+
    | 8.7                | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+

    1. This vulnerability affects only Cisco Aironet 1800 Series Access Points
    that are running Releases 8.2.121.0 through 8.5.105.0. Cisco Aironet 2800
    and 3800 Series Access Points are not vulnerable if they are running
    Release 8.2.x.

    2. This vulnerability affects only Cisco Aironet 2800 and 3800 Series
    Access Points that are running Releases 8.3.102.0 through 8.5.105.0.

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.

Source

  o This vulnerability was found during internal security testing.

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

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20180502-aironet-ssh

Revision History

  o 
    +----------+-----------------------------+----------+---------+---------------+
    | Version  |         Description         | Section  | Status  |     Date      |
    +----------+-----------------------------+----------+---------+---------------+
    | 1.0      | Initial public release.     | --        | Final   | 2018-May-02   |
    +----------+-----------------------------+----------+---------+---------------+

- ----------------------------------------------------------------------------

Cisco Aironet 1810, 1830, and 1850 Series Access Points Point-to-Point
Tunneling Protocol Denial of Service Vulnerability

High
Advisory ID:
cisco-sa-20180502-ap-ptp
First Published:
2018 May 2 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvf73890
 
CVE-2018-0234
 
CWE-20
 
CVSS Score:
Base 8.6
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2018-0234
 
CWE-20

Summary

  o A vulnerability in the implementation of Point-to-Point Tunneling Protocol 
    (PPTP) functionality in Cisco Aironet 1810, 1830, and 1850 Series Access
    Points could allow an unauthenticated, remote attacker to cause an affected
    device to reload, resulting in a denial of service (DoS) condition.

    The vulnerability is due to insufficient validation of Generic Routing
    Encapsulation (GRE) frames that pass through the data plane of an affected
    access point. An attacker could exploit this vulnerability by initiating a
    PPTP connection to an affected access point from a device that is
    registered to the same wireless network as the access point and sending a
    malicious GRE frame through the data plane of the access point. A
    successful exploit could allow the attacker to cause the NSS core process
    on the affected access point to crash, which would cause the access point
    to reload and result in a DoS condition.

    Cisco has released software updates that address this vulnerability. There
    are no workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-ap-ptp

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Aironet 1810, 1830, and 1850 Series Access
    Points that are running Cisco Mobility Express Software Release 8.4.100.0,
    8.5.103.0, or 8.5.105.0 and are configured as a master, subordinate, or
    standalone access point.

    Determining the Software Release

    To determine which Cisco Mobility Express Software release is running on a
    Cisco Mobility Express controller and the associated access points,
    administrators can use the controller's web interface or the access point's
    CLI.

    To use the controller's web interface, do the following:

     1. By using a browser, log in to the web interface.
     2. Choose Management > Software Update.
     3. Refer to the release number that appears at the top of the page.

    To use the access point's CLI, log in to the access point via Telnet or
    SSH, issue the show version command, and then refer to the output of the
    command. The following example shows the output of the command for a
    Cisco Aironet 1852i Access Point that is running Cisco Mobility Express
    Software Release 8.3.111.0:

        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 : 8.3.111.0
        Primary Boot Image : 8.3.111.0
        Backup Boot Image : 8.1.106.33
        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 Cisco Aironet
    Access Points that are running Cisco Lightweight Access Point (AP) Software
    or Cisco IOS Software.

    Cisco has also confirmed that this vulnerability does not affect the
    following Cisco products:

      - Aironet 1560 Series Access Points
      - Aironet 2800 Series Access Points
      - Aironet 3800 Series Access Points
      - Wireless LAN Controllers, any model

Workarounds

  o There are no workarounds that address this vulnerability.

Fixed Software

  o Cisco has released free software updates that address the vulnerability
    described in this advisory. Customers may only install and expect support
    for software versions and feature sets for which they have purchased a
    license. By installing, downloading, accessing, or otherwise using such
    software upgrades, customers agree to follow the terms of the Cisco
    software license:
    https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

    Additionally, customers may only download software for which they have a
    valid license, procured from Cisco directly, or through a Cisco authorized
    reseller or partner. In most cases this will be a maintenance upgrade to
    software that was previously purchased. Free security software updates do
    not entitle customers to a new software license, additional software
    feature sets, or major revision upgrades.

    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
    providers.

    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):
    https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

    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.

    Fixed Releases

    Customers should upgrade to an appropriate release as indicated in the
    table in this section. To help ensure a complete upgrade solution, consider
    that this advisory is part of a collection that includes the following
    advisories:

      - cisco-sa-20180502-aironet-ssh: Cisco Aironet 1800, 2800, and 3800
        Series Access Points Secure Shell Privilege Escalation Vulnerability
      - cisco-sa-20180502-ap-ptp: Cisco Aironet 1810, 1830, and 1850 Series
        Access Points Point-to-Point Tunneling Protocol Denial of Service
        Vulnerability
      - cisco-sa-20180502-wlc-ip: Cisco Wireless LAN Controller IP Fragment
        Reassembly Denial of Service Vulnerability
      - cisco-sa-20180502-wlc-mfdos: Cisco Wireless LAN Controller 802.11
        Management Frame Denial of Service Vulnerability

    In the following table, the left column lists major releases of Cisco
    software. The center column indicates whether a major release is affected
    by the vulnerability described in this advisory and the first minor release
    that includes the fix for this vulnerability. The right column indicates
    whether a major release is affected by all the vulnerabilities described in
    this collection of advisories and which release includes fixes for those
    vulnerabilities.

    +--------------------+--------------------+-----------------------------------+
    | Cisco Mobility     | First Fixed        | First Fixed Release for All       |
    | Express Software   | Release for        | Vulnerabilities Described in the  |
    | Major Release      | This Vulnerability | Collection of Advisories          |
    +--------------------+--------------------+-----------------------------------+
    | Prior to 8.0       | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+
    | 8.0                | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+
    | 8.1                | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+
    | 8.2                | Not vulnerable     | 8.5.120.0                         |
    +--------------------+--------------------+-----------------------------------+
    | 8.3                | Not vulnerable     | 8.5.120.0                         |
    +--------------------+--------------------+-----------------------------------+
    | 8.4                | 8.5.110.0          | 8.5.120.0                         |
    +--------------------+--------------------+-----------------------------------+
    | 8.5                | 8.5.110.0          | 8.5.120.0                         |
    +--------------------+--------------------+-----------------------------------+
    | 8.6                | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+
    | 8.7                | Not vulnerable     | Not vulnerable                    |
    +--------------------+--------------------+-----------------------------------+

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.

Source

  o Cisco would like to thank Simon Lockhart of CableCom Networking for
    reporting this vulnerability.

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

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20180502-ap-ptp

Revision History

    +----------+-----------------------------+----------+---------+---------------+
    | Version  |         Description         | Section  | Status  |     Date      |
    +----------+-----------------------------+----------+---------+---------------+
    | 1.0      | Initial public release.     | --        | Final   | 2018-May-02   |
    +----------+-----------------------------+----------+---------+---------------+

Legal Disclaimer

  o 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 standalone copy or paraphrase of the text of this document that omits the
    distribution URL is an uncontrolled copy and may lack important information
    or contain factual errors. The information in this document is intended for
    end users of Cisco products.

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

- ---------------------------------------------------------------------------

Cisco Aironet Access Points Central Web Authentication FlexConnect Client ACL
Bypass Vulnerability

Medium
Advisory ID:
cisco-sa-20180502-ap-acl
First Published:
2018 May 2 16:00 GMT
Version 1.0:
Final
Workarounds:
Yes
Cisco Bug IDs:
CSCve17756
 
CVE-2018-0250
 
CWE-693
 
CVSS Score:
Base 4.1
CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
CVE-2018-0250
 
CWE-693
 
Summary

  o A vulnerability in Central Web Authentication (CWA) with FlexConnect Access
    Points (APs) for Cisco Aironet 1560, 1810, 1810w, 1815, 1830, 1850, 2800,
    and 3800 Series APs could allow an authenticated, adjacent attacker to
    bypass a configured FlexConnect access control list (ACL).

    The vulnerability is due to the AP ignoring the ACL download from the
    client during authentication. An attacker could exploit this vulnerability
    by connecting to the targeted device with a vulnerable configuration. A
    successful exploit could allow the attacker to bypass a configured client
    FlexConnect ACL.

    There are workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20180502-ap-acl

Affected Products

  o Vulnerable Products

    This vulnerability affects the following Cisco products if they are running
    a vulnerable release of Central Web Authentication with FlexConnect Access
    Points Software:
      - Aironet 1560 Series Access Points
      - Aironet 1810 Series OfficeExtend Access Points
      - Aironet 1810w Series Access Points
      - Aironet 1815 Series Access Points
      - Aironet 1830 Series Access Points
      - Aironet 1850 Series Access Points
      - Aironet 2800 Series Access Points
      - Aironet 3800 Series Access Points
    Note: Central Web Authentication with FlexConnect Access Points was an
    unsupported configuration until 8.5.100.0.

    For information about affected software releases, consult the Cisco bug ID
    (s) at the top of this advisory.

    Products Confirmed Not Vulnerable

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

Workarounds

  o If the client has to authenticate for a second time then the ACL is
    properly applied and there is no security vulnerability; therefore, a
    mitigation for this vulnerability could be to force a client to
    re-authenticate.

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
    providers.

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.

Source

  o This vulnerability was found during the resolution of a Cisco 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

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-ap-acl

Revision History

  o 
    +----------+-----------------------------+----------+---------+---------------+
    | Version  |         Description         | Section  | Status  |     Date      |
    +----------+-----------------------------+----------+---------+---------------+
    | 1.0      | Initial public release.     | --        | Final   | 2018-May-02   |
    +----------+-----------------------------+----------+---------+---------------+

Legal Disclaimer

  o 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 standalone copy or paraphrase of the text of this document that omits the
    distribution URL is an uncontrolled copy and may lack important information
    or contain factual errors. The information in this document is intended for
    end users of Cisco products.

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

- -------------------------------------------------------------------------------

Cisco Aironet 1800 Series Access Point 802.11 Denial of Service Vulnerability

Medium
Advisory ID:
cisco-sa-20180502-aironet-dos
First Published:
2018 May 2 16:00 GMT
Last Updated: 
2018 May 2 20:34 GMT
Version 1.1:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvg02116
 
CVE-2018-0249
 
CWE-20
 
CVSS Score:
Base 4.7
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:X/RL:X/RC:X
CVE-2018-0249
 
CWE-20

Summary

  o A vulnerability when handling incoming 802.11 Association Requests for
    Cisco Aironet 1800 Series Access Point (APs) on Qualcomm Atheros (QCA)
    based hardware platforms could allow an unauthenticated, adjacent attacker
    to cause a denial of service (DoS) condition on an affected system. A
    successful exploit could prevent new clients from joining the AP.

    The vulnerability is due to incorrect handling of malformed or invalid
    802.11 Association Requests. An attacker could exploit this vulnerability
    by sending a malformed stream of 802.11 Association Requests to the local
    interface of the targeted device. A successful exploit could allow the
    attacker to cause a DoS situation on an affected system, causing new client
    802.11 Association Requests to fail.

    There are no workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-aironet-dos

Affected Products

  o Vulnerable Products

    This vulnerability affects the following Cisco products:

      - Aironet 1560 Series Access Points
      - Aironet 1810 Series OfficeExtend Access Points
      - Aironet 1810w Series Access Points
      - Aironet 1815 Series Access Points
      - Aironet 1830 Series Access Points
      - Aironet 1850 Series Access Points

    For information about affected software releases, consult the Cisco bug ID
    (s) at the top of this advisory.

    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 Cisco Aironet
    2800 Series Access Points or Cisco Aironet 3800 Series Access Points.

Workarounds

  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
    providers.

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.

Source

  o This vulnerability was found during the resolution of a Cisco 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

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-aironet-dos

Revision History

  o 
    +---------+--------------------------+-----------------+--------+-------------+
    | Version |       Description        |     Section     | Status |    Date     |
    +---------+--------------------------+-----------------+--------+-------------+
    |         | Updated to indicate that | Vulnerable      |        |             |
    |         | Cisco Aironet 2800       | Products and    |        |             |
    | 1.1     | Series and 3800 Series   | Products        | Final  | 2018-May-02 |
    |         | Access Points are not    | Confirmed Not   |        |             |
    |         | vulnerable.              | Vulnerable      |        |             |
    +---------+--------------------------+-----------------+--------+-------------+
    | 1.0     | Initial public release.  | --               | Final  | 2018-May-02 |
    +---------+--------------------------+-----------------+--------+-------------+

Legal Disclaimer

  o 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 standalone copy or paraphrase of the text of this document that omits the
    distribution URL is an uncontrolled copy and may lack important information
    or contain factual errors. The information in this document is intended for
    end users of Cisco products.

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

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