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             AUSCERT External Security Bulletin Redistribution

 Cisco Adaptive Security Appliance Software Web-Based Management Interface
               Reflected Cross-Site Scripting Vulnerability
                              23 October 2020


        AusCERT Security Bulletin Summary

Product:           Cisco Adaptive Security Appliance Software
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-3599  

Original Bulletin: 

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Cisco Adaptive Security Appliance Software Web-Based Management Interface
Reflected Cross-Site Scripting Vulnerability

Priority:        Medium

Advisory ID:     cisco-sa-asa-rxss-L54Htxp

First Published: 2020 October 21 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:   CSCvv33712




  o A vulnerability in the web-based management interface of Cisco Adaptive
    Security Appliance (ASA) Software could allow an unauthenticated, remote
    attacker to conduct a cross-site scripting (XSS) attack against a user of
    the interface.

    This vulnerability exists because the web-based management interface does
    not properly validate user-supplied input. An attacker could exploit this
    vulnerability by persuading a user of the interface to click a crafted
    link. A successful exploit could allow the attacker to execute arbitrary
    script code in the context of the interface or access sensitive,
    browser-based information.

    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

    At the time of publication, this vulnerability affected Cisco products if
    they were running a vulnerable release of Cisco ASA Software and had web
    management access enabled.

    For information about which Cisco software releases are vulnerable, see the
    Fixed Software section of this advisory. See the Details section in the bug
    ID(s) at the top of this advisory for the most complete and current

    Determine the Device Configuration

    To determine whether web management is enabled, use the show running-config
    http command. The following example shows the output of the command for a
    device that has the web management feature enabled and that allows access
    to the web management feature from the network through the
    management interface:

        ciscoasa# show running-config http 

        http server enable
        http Management

    Note: The device would only be vulnerable to requests that are sent from an
    IP address in the range that is configured in the http <remote_ip_address>
    <remote_subnet_mask> <interface_name> command.

    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 Firepower
    Threat Defense (FTD) Software or Cisco Firepower Management Center (FMC)


  o There are no workarounds that address this vulnerability.

Fixed Software

  o When considering software upgrades , customers are advised to regularly
    consult the advisories for Cisco products, which are available from the
    Cisco Security Advisories 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

    Fixed Releases

    At the time of publication, the release information in the following table
    (s) was accurate. See the Details section in the bug ID(s) at the top of
    this advisory for the most complete and current information.

    The left column lists Cisco software releases, and the right column
    indicates whether a release was affected by the vulnerability described in
    this advisory and which release included the fix for this vulnerability.

    Cisco ASA Software

    Cisco ASA Software Release   First Fixed Release for This Vulnerability
    Earlier than 9.6 ^1          Migrate to a fixed release.
    9.6 ^1             
    9.7 ^1                       Migrate to a fixed release.

    1. Cisco ASA Software releases 9.7 and earlier have reached end of software
    maintenance. Customers are advised to migrate to a supported release that
    includes the fix for this vulnerability.

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 Phil Purviance 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.

Related to This Advisory

  o Cross-Site Scripting


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

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    | 1.0      | Initial public release.   | -        | Final  | 2020-OCT-21  |

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