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             AUSCERT External Security Bulletin Redistribution

      Cisco Web Security Appliance Privilege Escalation Vulnerability
                                8 July 2021


        AusCERT Security Bulletin Summary

Product:           Cisco Web Security Appliance
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Root Compromise                 -- Existing Account
                   Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-1359  

Original Bulletin: 

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Cisco Web Security Appliance Privilege Escalation Vulnerability

Priority:        High
Advisory ID:     cisco-sa-scr-web-priv-esc-k3HCGJZ
First Published: 2021 July 7 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvv81569
CVE Names:       CVE-2021-1359
CWEs:            CWE-112


  o A vulnerability in the configuration management of Cisco AsyncOS for Cisco
    Web Security Appliance (WSA) could allow an authenticated, remote attacker
    to perform command injection and elevate privileges to root .

    This vulnerability is due to insufficient validation of user-supplied XML
    input for the web interface. An attacker could exploit this vulnerability
    by uploading crafted XML configuration files that contain scripting code to
    a vulnerable device. A successful exploit could allow the attacker to
    execute arbitrary commands on the underlying operating system and elevate
    privileges to root . An attacker would need a valid user account with the
    rights to upload configuration files to exploit this vulnerability.

    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 AsyncOS for Cisco WSA, both virtual and
    hardware appliances.

    For information about which Cisco software releases are vulnerable, see the
    Fixed Software section 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
    Cisco products:

       Email Security Appliance, both virtual and hardware appliances
       Content Security Management Appliance, both virtual and hardware


  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 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: https://www.cisco.com/c

    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

    Customers are advised to upgrade to an appropriate fixed software release
    as indicated in the following table:

    Cisco AsyncOS for Web Security Appliance     First Fixed Release
    Major Release
    11.8 and earlier                             12.0.3-005
    12.0                                         12.0.3-005
    12.5                                         12.5.2 ^1
    14.0                                         Not affected.

    1: Release 12.5.2 will be a Maintenance Release (MR) a few days after the
    publication date of this security advisory.

    In most cases, the software can be upgraded over the network by using the
    System Upgrade options in the Cisco WSA web interface. To upgrade a device
    by using the web interface, do the following:

     1. Choose System Administration > System Upgrade .
     2. Click Upgrade Options .
     3. Choose Download and Install .
     4. Choose the release to upgrade to.
     5. In the Upgrade Preparation area, choose the appropriate options.
     6. Click Proceed to begin the upgrade. A progress bar displays the status
        of the upgrade.

    After the upgrade is complete, the device reboots.

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 Alvaro Gutierrez of mnemonic for reporting this

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.


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-scr-web-priv-esc-k3HCGJZ

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    | 1.0      | Initial public release.   | -        | Final  | 2021-JUL-07  |

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