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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0133
          Cisco AnyConnect Secure Mobility Client for Windows DLL
                          Injection Vulnerability
                              14 January 2021

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

Product:           Cisco AnyConnect Secure Mobility Client
Publisher:         Cisco Systems
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Reduced Security                -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-1237  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-dll-injec-pQnryXLf

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Cisco AnyConnect Secure Mobility Client for Windows DLL Injection Vulnerability

Priority:        High
Advisory ID:     cisco-sa-anyconnect-dll-injec-pQnryXLf
First Published: 2021 January 13 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvw16727
CVE Names:       CVE-2021-1237
CWEs:            CWE-427

Summary

  o A vulnerability in the Network Access Manager and Web Security Agent
    components of Cisco AnyConnect Secure Mobility Client for Windows could
    allow an authenticated, local attacker to perform a DLL injection attack.
    To exploit this vulnerability, the attacker would need to have valid
    credentials on the Windows system.

    The vulnerability is due to insufficient validation of resources that are
    loaded by the application at run time. An attacker could exploit this
    vulnerability by inserting a configuration file in a specific path in the
    system which, in turn, causes a malicious DLL file to be loaded when the
    application starts. A successful exploit could allow the attacker to
    execute arbitrary code on the affected machine with SYSTEM privileges.

    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-anyconnect-dll-injec-pQnryXLf

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco AnyConnect Secure Mobility Client for
    Windows releases earlier than Release 4.9.04043.

    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:

       AnyConnect Secure Mobility Client for MacOS
       AnyConnect Secure Mobility Client for Linux
       AnyConnect Secure Mobility Client for mobile device operating systems
        such as iOS, Android, and Universal Windows Platform

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 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

    Cisco fixed this vulnerability in Cisco AnyConnect Secure Mobility Client
    for Windows releases 4.9.04043 and later.

    To download the software from the Software Center on Cisco.com, do the
    following:

     1. Click Browse all .
     2. Choose Security > VPN and Endpoint Security Clients > Cisco VPN Clients
        > AnyConnect Secure Mobility Client > AnyConnect Secure Mobility Client
        v4.x.
     3. Choose the release from the left pane of the AnyConnect Secure Mobility
        Client v4.x page.

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 Nuttakorn Tungpoonsup of the Secure D Center
    Research Team 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.

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-dll-injec-pQnryXLf

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    +----------+---------------------------+----------+--------+--------------+
    | 1.0      | Initial public release.   | -        | Final  | 2021-JAN-13  |
    +----------+---------------------------+----------+--------+--------------+

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