04 June 2020
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== 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 | +----------+---------------------------+----------+--------+--------------+ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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