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AUSCERT External Security Bulletin Redistribution
ESB-2020.1944
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-ir800-img-verif-wHhLYHjK
- --------------------------BEGIN INCLUDED TEXT--------------------
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
CVE-2020-3208
CWE-264
CVSS Score:
6.7 AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-ios-ir800-img-verif-wHhLYHjK
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
Details
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.
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 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
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.
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
Advisories
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
publication:
cisco-sa-ios-iot-udp-vds-inj-f2D5Jzrt
cisco-sa-ios-iot-vds-cmd-inj-VfJtqGhE
cisco-sa-ios-iot-vds-cred-uPMp9zbY
cisco-sa-ios-ir800-img-verif-wHhLYHjK
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 This vulnerability was found during internal security testing by X.B. of
the Cisco Advanced Security Initiatives Group (ASIG) and E.I. of Cisco
PSIRT.
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
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-ios-ir800-img-verif-wHhLYHjK
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-JUN-03 |
+----------+---------------------------+----------+--------+--------------+
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