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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.2628
        Cisco Packet Tracer for Windows DLL Injection Vulnerability
                               5 August 2021

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

Product:           Cisco Packet Tracer for Windows
Publisher:         Cisco Systems
Operating System:  Cisco
                   Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-1593  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-packettracer-dll-inj-Qv8Mk5Jx

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Packet Tracer for Windows DLL Injection Vulnerability

Priority:        High
Advisory ID:     cisco-sa-packettracer-dll-inj-Qv8Mk5Jx
First Published: 2021 August 4 16:00 GMT
Version 1.0:     Final
Workarounds:     No workarounds available
Cisco Bug IDs:   CSCvx88162
CVE Names:       CVE-2021-1593
CWEs:            CWE-427

Summary

  o A vulnerability in Cisco Packet Tracer for Windows could allow an
    authenticated, local attacker to perform a DLL injection attack on an
    affected device. To exploit this vulnerability, the attacker must have
    valid credentials on the Windows system.

    This vulnerability is due to incorrect handling of directory paths at run
    time. An attacker could exploit this vulnerability by inserting a
    configuration file in a specific path on the system, which can cause a
    malicious DLL file to be loaded when the application starts. A successful
    exploit could allow an attacker with normal user privileges to execute
    arbitrary code on the affected system with the privileges of another user's
    account.

    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-packettracer-dll-inj-Qv8Mk5Jx

Affected Products

  o Vulnerable Products

    This vulnerability affects 32-bit and 64-bit Cisco Packet Tracer for
    Windows Releases 7.3.1 and 8.0.0.

    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:

       Cisco Packet Tracer for Linux
       Cisco Packet Tracer for MacOS

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 32-bit and 64-bit Cisco Packet Tracer for
    Windows Releases 8.0.1 and later.

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 Hou JingYi of Qihoo 360 CERT 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-packettracer-dll-inj-Qv8Mk5Jx

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    +----------+---------------------------+----------+--------+--------------+
    | 1.0      | Initial public release.   | -        | Final  | 2021-AUG-04  |
    +----------+---------------------------+----------+--------+--------------+

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