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             AUSCERT External Security Bulletin Redistribution

        Cisco Wireless LAN Controller HTTP Parsing Engine Denial of
                           Service Vulnerability
                                12 May 2020


        AusCERT Security Bulletin Summary

Product:           Cisco Wireless LAN Controller
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-15276  

Original Bulletin: 

Revision History:  May      12 2020: Vendor released update 1.2 
                   November  7 2019: Initial Release

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Cisco Wireless LAN Controller HTTP Parsing Engine Denial of Service

Priority:        High

Advisory ID:     cisco-sa-20191106-wlc-dos

First Published: 2019 November 6 16:00 GMT

Last Updated:    2020 May 11 15:58 GMT

Version 1.2:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvp92098



CVSS Score:


  o A vulnerability in the web interface of Cisco Wireless LAN Controller
    Software could allow a low-privileged, authenticated, remote attacker to
    cause a denial of service (DoS) condition on an affected device.

    The vulnerability exists due to a failure of the HTTP parsing engine to
    handle specially crafted URLs. An attacker could exploit this vulnerability
    by authenticating with low privileges to an affected controller and
    submitting the crafted URL to the web interface of the affected device.
    Conversely, an unauthenticated attacker could exploit this vulnerability by
    persuading a user of the web interface to click the crafted URL. A
    successful exploit could allow the attacker to cause an unexpected restart
    of the device, resulting 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:

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Wireless LAN Controllers running Software
    Release 8.4 and later, and earlier than 8.10.

    Products Confirmed Not Vulnerable

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


  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:

    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

    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:

    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

    Fixed Releases

    In the following table, the left column lists major Cisco software
    releases. The right column indicates the recommended major release which
    includes the fix for the vulnerability described in this advisory.

    Cisco Wireless LAN Controller Major Software Release   First Fixed Release
    Prior to 8.0                                           Not vulnerable.
    8.0                                                    Not vulnerable.
    8.1                                                    Not vulnerable.
    8.2                                                    Not vulnerable.
    8.3                                                    Not vulnerable.
    8.9                                                    8.10
    8.10                                                   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.


  o Cisco would like to thank independent security researcher SecuNinja 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.

Action Links for This Advisory

  o Snort Rule 52126


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/

Revision History

  o +---------+-----------------------------+----------+--------+-------------+
    | Version |         Description         | Section  | Status |    Date     |
    | 1.2     | Updated Fixed Software      | Fixed    | Final  | 2020-MAY-11 |
    |         | table with 8.8 release.     | Software |        |             |
    | 1.1     | Updated Fixed Software      | Fixed    | Final  | 2019-DEC-11 |
    |         | table with 8.5 release.     | Software |        |             |
    | 1.0     | Initial public release.     | -        | Final  | 2019-NOV-06 |

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