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             AUSCERT External Security Bulletin Redistribution

  Cisco IOS Software for Cisco 800 Series Industrial Integrated Services
              Routers Image Verification Bypass Vulnerability
                                4 June 2020


        AusCERT Security Bulletin Summary

Product:           Cisco IOS Software for Cisco 809 and 829 Industrial Integrated Services Routers
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Unauthorised Access -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-3208  

Original Bulletin: 

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Cisco IOS Software for Cisco 800 Series Industrial Integrated Services Routers
Image Verification Bypass Vulnerability

Priority:        High

Advisory ID:     cisco-sa-ios-ir800-img-verif-wHhLYHjK

First Published: 2020 June 3 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds availableCisco Bug IDs:   CSCvq27907



CVSS Score:


    A vulnerability in the image verification feature of Cisco IOS Software for
    Cisco 809 and 829 Industrial Integrated Services Routers (Industrial ISRs)
    could allow an authenticated, local attacker to boot a malicious software
    image on an affected device.

    The vulnerability is due to insufficient access restrictions on the area of
    code that manages the image verification feature. An attacker could exploit
    this vulnerability by first authenticating to the targeted device and then
    logging in to the Virtual Device Server (VDS) of an affected device. The
    attacker could then, from the VDS shell, disable Cisco IOS Software
    integrity (image) verification.

    A successful exploit could allow the attacker to boot a malicious Cisco IOS
    Software image on the targeted device. To exploit this vulnerability, the
    attacker must have valid user credentials at privilege level 15.

    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:

    This advisory is part of the June 3, 2020, release of the Cisco IOS and IOS
    XE Software Security Advisory Bundled Publication, which includes 23 Cisco
    Security Advisories that describe 25 vulnerabilities. For a complete list
    of the advisories and links to them, see Cisco Event Response: June 2020
    Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled
    Publication .

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco 809 and 829 Industrial ISRs if they are
    running a vulnerable release of Cisco IOS Software.

    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:

       800 Series ISRs
       807 Industrial ISRs
       1000 Series Connected Grid Routers (CGR 1000)
       IOS XE Software
       IOS XR Software
       NX-OS Software


  o The Cisco 800 Series Industrial ISRs are designed on a hypervisor
    architecture, where Cisco IOS Software, a Guest Operating System (Guest
    OS), and VDS run as separate virtual machines (VMs). Cisco IOS Software and
    Guest OS need to access some shared devices. Examples are embedded
    multimedia card (eMMC) flash memory, USB ports, and the console. VDS
    coordinates access to the shared devices and provides communication
    channels between VMs over emulated Ethernet interfaces.

    The vulnerability is due to insufficient access restrictions on the area of
    code that manages the verification of the Cisco IOS Software instance. An
    attacker could exploit this vulnerability to boot a malicious Cisco IOS
    Software instance on an affected device.


  o There are no workarounds that address this vulnerability

Fixed Software

    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 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

    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:

    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

    Cisco IOS Software

    To help customers determine their exposure to vulnerabilities in Cisco IOS
    Software, Cisco provides the Cisco Software Checker to identify any Cisco
    Security Advisories that impact a specific Cisco IOS Software release and
    the earliest release that fixes the vulnerabilities described in each
    advisory ("First Fixed"). If applicable, the tool also returns the earliest
    release that fixes all the vulnerabilities described in all the advisories
    identified ("Combined First Fixed").

    Customers can use the Cisco Software Checker to search advisories in the
    following ways:

       Choose the software and one or more releases
       Upload a .txt file that includes a list of specific releases
       Enter the output of the show version command

    After initiating a search, customers can customize the search to include
    all Cisco Security Advisories, a specific advisory, or all advisories in
    the most recent bundled publication.

    Customers can use the following form to determine whether a release is
    affected by any Cisco Security Advisory by entering a Cisco IOS Software
    release-for example, 15.1(4)M2 :

    [                    ] [Check]

    By default, the Cisco Software Checker includes results only for
    vulnerabilities that have a Critical or High Security Impact Rating (SIR).
    To include results for Medium SIR vulnerabilities, customers can use the
    Cisco Software Checker on Cisco.com and check the Medium check box in the
    drop-down list under Impact Rating when customizing a search.

    Fixed Releases for All VDS-Related Vulnerabilities in This Bundle of

    This release of the Cisco IOS and IOS XE Software Security Advisory Bundled
    Publication contains multiple advisories for vulnerabilities that affect
    VDS. To help ensure a complete upgrade solution for these vulnerabilities,
    administrators are advised to upgrade affected devices to a fixed software
    release that addresses all VDS-related advisories in this bundled


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 This vulnerability was found during internal security testing by X.B. of
    the Cisco Advanced Security Initiatives Group (ASIG) and E.I. of Cisco

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 Cisco Event Response: June 2020 Semiannual Cisco IOS and IOS XE Software
    Security Advisory Bundled Publication


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

Revision History

  o +----------+---------------------------+----------+--------+--------------+
    | Version  |        Description        | Section  | Status |     Date     |
    | 1.0      | Initial public release.   | -        | Final  | 2020-JUN-03  |

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