ESB-2018.1825 - [Cisco] Cisco AnyConnect: Denial of service - Existing account 2018-06-21

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1825
        Cisco AnyConnect Secure Mobility Client for Windows Desktop
                      Denial of Service Vulnerability
                               21 June 2018

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

Product:           Cisco AnyConnect
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0373  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-anyconnect-dos

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Cisco AnyConnect Secure Mobility Client for Windows Desktop Denial of Service
Vulnerability

Medium

Advisory ID:     cisco-sa-20180620-anyconnect-dos
First Published: 2018 June 20 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvj47654
 
CVE-2018-0373
CWE-20
CVSS Score:
Base 6.5
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X

Summary

  * A vulnerability in vpnva-6.sys for 32-bit Windows and vpnva64-6.sys for
    64-bit Windows of Cisco AnyConnect Secure Mobility Client for Windows
    Desktop could allow an authenticated, local attacker to cause a denial of
    service (DoS) condition on an affected system.

    The vulnerability is due to improper validation of user-supplied data. An
    attacker could exploit this vulnerability by sending a malicious
    request to the application. A successful exploit could allow the attacker
    to cause a DoS condition on the affected system.

    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-20180620-anyconnect-dos

Affected Products

  * Vulnerable Products

    This vulnerability affects Cisco AnyConnect Secure Mobility Client for
    Windows Desktop. 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 the following
    products:

      + AnyConnect Secure Mobility Client for MacOS or for Linux.
      + AnyConnect Secure Mobility Client for mobile device operating systems
        such as iOS, Android, and Windows Phone.

Workarounds

  * There are no workarounds that address this vulnerability.

Fixed Software

  * 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

  * 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

  * This vulnerability was discovered by Cesar Cerrudo, Ilja van Sprundel, and
    Enrique Nissim from IOActive.

    Cisco would like to thank Gert Doering at OpenVPN for reporting this
    vulnerability.

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

  * Subscribe

URL

  * https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180620-anyconnect-dos

Revision History

  * +----------------------------------------------------------------------------+
    | Version  |        Description         | Section  | Status  |     Date      |
    |----------+----------------------------+----------+---------+---------------|
    | 1.0      | Initial public release.    | -        | Final   | 2018-June-20  |
    +----------------------------------------------------------------------------+

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