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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3617 Security updates for Cisco IOx software 26 September 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOx Publisher: Cisco Systems Operating System: Cisco Impact/Access: Increased Privileges -- Existing Account Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-12656 CVE-2019-12648 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-iox https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-ios-gos-auth Comment: This bulletin contains two (2) Cisco Systems security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco IOx Application Environment Denial of Service Vulnerability Priority: High Advisory ID: cisco-sa-20190925-iox First Published: 2019 September 25 16:00 GMT Version 1.0: Final Workarounds: No workarounds available CVE-2019-12656 CWE-20 CVSS Score: 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X Summary o A vulnerability in the IOx application environment of multiple Cisco platforms could allow an unauthenticated, remote attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a denial of service (DoS) condition. The vulnerability is due to a Transport Layer Security (TLS) implementation issue. An attacker could exploit this vulnerability by sending crafted TLS packets to the IOx web server on an affected device. A successful exploit could allow the attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a DoS condition. 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-20190925-iox This advisory is part of the September 25, 2019, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 12 Cisco Security Advisories that describe 13 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: September 2019 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication . Affected Products o Vulnerable Products This vulnerability affects the following Cisco products if they are configured with the Cisco IOx application environment and are running a software release earlier than the first fixed release for that device: Cisco 510 WPAN Industrial Router: Industrial Routers Operating System Software Cisco CGR 1000 Compute Module: CGR 1000 IOx Compute Platform Firmware Cisco IC3000 Industrial Compute Gateway: Industrial Compute Gateway Software Cisco Industrial Ethernet 4000 Series Switches: Cisco IOS Software For more information about which software releases are vulnerable, see the Fixed Software section of this advisory. Assess the Cisco IOx Application Environment Cisco 510 WPAN Industrial Router Administrators can see the status of IOx functionality by examining the device in Cisco IoT Field Network Director or by accessing the IOx (Linux) terminal and using the monit summary CLI command, as shown in the following example: #monit summary If the output contains Process 'caf' Running , as shown in the following example, the device is vulnerable: Process 'caf' Running Cisco CGR 1000 Compute Module Administrators can see the status of IOx functionality by using the show iox host list detail | include IOX Server is running CLI command, as shown in the following example: CGR1000#show iox host list detail | include IOX Server is running IOX Server is running. Process ID: 305 CGR1000# Cisco IC3000 Industrial Compute Gateway On the Cisco IC3000, IOx functionality is enabled by default. Administrators can see the status of IOx functionality by using the show iox summary CLI command, as shown in the following example: ic3k#show iox summary IOx Infrastructure Summary: --------------------------- eid: IC3000-2C2F-K9+FOC2227Y304 pfm: IC3000-2C2F-K9 s/n: FOC2227Y304 images: Lnx: 1.0.1., IOx: 1.7.0:r/1.7.0.0:fc6e9cf boot: 2018-09-17 17:37:55 time: 2018-09-18 18:07:28 load: 18:07:28 up 1 day, 29 min, 0 users, load average: 0.32, 0.11, 0.02 memory: ok, used: 481/7854 (6%) disk: ok, used: /:270305/338869 (79%), /software:57272/87462892 (0%) process: warning, running: 4/5, failed: sshd networking: ok logs: ok, errors: caf (0) apps: ok, Cisco Industrial Ethernet 4000 Series Switches Administrators can see the status of IOx functionality by using the show iox detail command, as shown in the following example: switch#show iox detail IOx InfrastructureSummary: --------------------------- Services State : OK NetworkingConfigured: : OK IOSNetworkReachable : OK HostInfrastructureState: OK . . . IOx Processes State: -------------------- caf : Running ioxhad : Running libvirtd : Running monit : Running 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 Cisco IOS XE Software, Cisco IOS XR Software, or Cisco NX-OS Software. Details o If this vulnerability is exploited, the affected Cisco IOx web server will stop processing HTTPS requests from the IOx client and the browser until the affected devices are reloaded. 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. Fixed Releases Cisco fixed this vulnerability in the following releases: Cisco 510 WPAN Industrial Router: Industrial Routers Operating System Software releases 6.1.27 and later Cisco IC3000 Industrial Compute Gateway: Industrial Compute Gateway Software releases 1.1.1 and later Cisco Industrial Ethernet 4000 Series Switches: Cisco IOS Software releases 15.2(7)E and later Cisco expects to fix this vulnerability in the following releases: Cisco CGR 1000 Compute Module: CGR 1000 IOx Compute Platform Firmware releases 1.8.x.y 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 This vulnerability was found during internal security testing. 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: September 2019 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20190925-iox Revision History o +---------+------------------------+---------+--------+-------------------+ | Version | Description | Section | Status | Date | +---------+------------------------+---------+--------+-------------------+ | 1.0 | Initial public | - | Final | 2019-September-25 | | | release. | | | | +---------+------------------------+---------+--------+-------------------+ - -------------------------------------------------------------------------------- Cisco IOx for IOS Software Guest Operating System Unauthorized Access Vulnerability Priority: High Advisory ID: cisco-sa-20190925-ios-gos-auth First Published: 2019 September 25 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvm86480 CVE-2019-12648 CWE-284 CVSS Score: 9.9 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:X/RL:X/RC:X Summary o A vulnerability in the IOx application environment for Cisco IOS Software could allow an authenticated, remote attacker to gain unauthorized access to the Guest Operating System (Guest OS) running on an affected device. The vulnerability is due to incorrect role-based access control (RBAC) evaluation when a low-privileged user requests access to a Guest OS that should be restricted to administrative accounts. An attacker could exploit this vulnerability by authenticating to the Guest OS by using the low-privileged-user credentials. An exploit could allow the attacker to gain unauthorized access to the Guest OS as a root user. 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-20190925-ios-gos-auth This advisory is part of the September 25, 2019, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 12 Cisco Security Advisories that describe 13 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: September 2019 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication . Affected Products o Vulnerable Products This vulnerability affects Cisco 800 Series Industrial Integrated Services Routers and Cisco 1000 Series Connected Grid Routers (CGR 1000) that are running a vulnerable release of Cisco IOS Software with Guest OS installed. For information about which Cisco IOS XE Software releases are vulnerable, see the Fixed Software section of this advisory. Determining if Guest OS is Enabled Administrators can determine if Guest OS is enabled on a device by using the show iox host list detail command in the device CLI. The following example shows the output of the command for a device that has Guest OS enabled: Router#show iox host list detail | include OS status OS status: RUNNING If this command does not exist, or if it produces an output that does not show the string " RUNNING" within the OS Status field, the device is not affected by the vulnerability described in 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 Cisco IOS XE Software, Cisco IOS XR Software, or Cisco NX-OS Software. Details o The Cisco Industrial Integrated Services Routers and Cisco 1000 Series Connected Grid Routers (CGR 1000) devices are designed on a Hypervisor architecture, where IOS and a Guest OS, such as a Linux Operating system, run as two separate Virtual Machines (VMs). Guest OS is available as part of a bundle IOS image that contains the Hypervisor, IOS, and Guest OS images. Customers that utilized a Cisco IOS Software image bundle for performing either an initial install or for a software upgrade will have Guest OS automatically installed as part of the software image bundle installation. Access to the Guest OS relies on the IOS role-based access control (RBAC) and should be restricted to users who have privilege level 15 credentials on IOS. Exploitation of this vulnerability could allow the attacker to successfully log in to the Guest OS using a low-privileged IOS user credentials. The vulnerability described in this Advisory is localized within the Guest OS instance. Under no circumstance could an exploitation allow the attacker to gain administrative access to the IOS Software running on an affected device. For this reason, though the Common Vulnerability Scoring System (CVSS) score corresponds to a Critical qualitative representation, this vulnerability is considered HIGH Security Impact Rating (SIR). Workarounds o There are no workarounds that address this vulnerability. Disabling Guest OS eliminates the attack vector for this vulnerability and may be a suitable mitigation until affected devices can be upgraded. Administrators can uninstall Guest OS by using the guest-os <ID> image uninstall command in global configuration mode. The following example shows the output of the show platform guest-os command for a device that has Guest OS uninstalled: Router#show platform guest-os Guest OS status: Installation: Unknown State: STOPPED 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 a tool, the Cisco IOS Software Checker , that identifies 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 this tool to perform the following tasks: Initiate a search by choosing one or more releases from a drop-down list or uploading a file from a local system for the tool to parse Enter the output of the show version command for the tool to parse Create a custom search by including all previously published Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication To determine whether a release is affected by any published Cisco Security Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a Cisco IOS Software release-for example, 15.1(4)M2 -in the following field: [ ] [Check] By default, the Cisco IOS Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, use the Cisco IOS Software Checker on Cisco.com and check the Medium check box in the Impact Rating drop-down list. 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. 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: September 2019 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20190925-ios-gos-auth Revision History o +---------+------------------------+---------+--------+-------------------+ | Version | Description | Section | Status | Date | +---------+------------------------+---------+--------+-------------------+ | 1.0 | Initial public | - | Final | 2019-September-25 | | | release. | | | | +---------+------------------------+---------+--------+-------------------+ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXYv/LWaOgq3Tt24GAQgkVA//V4kG5Ko0irj9CeqcG7PUXqXgeYXcxzFX appUy/WnWhli1fb3Nec8CIrjNHuOCNdFIzIArFs8lKOiz0YzfOytSWPY/gGAVuaG t2+da+LqBUTHc1H1YaDfcPBHw5SOQQ2+6AUaV4PgSPWOLkZQdrO0ZL6kbN4lBeU5 rHdk1VblB+kk1zscM0FMFvfHgPoQSF4ej3RxdnF3x+zpyUEaryYqPNg7dk/zuT6q jxreohd+KTC2WCFAkcga4uflPIQfa8FXLMcl3WoREQ6BDrUkOj5mGq40C0rMqkJJ sc3OHph+fWHigf7QRT2HN1Vh4adUiDPEpArTGmfP3C3KjzlGYVTK6WEytxHUMG7/ Wmh66cC2vUl/+RvM7WWSbt2FytLY/QqRzzCAz9JdfcwNOCowTIylvJLJPOQ5Vqqi YiCt0VATCI52mVDTOsg6Haf7dXIlNJUbMsuNQkTZgyVNowGJkkNuWdpCEnWcwnco njaY/O8WdWXTMCHZQkAw6l7qfgBZjnQZvKSY+RslcVYYnQeZ+B/eU+urv6uCSUum crDq8q3ODswEe4PgXgbF5B0su8MGSFwCOiyWRAzWSvEm6Ml2kqW6j3IurU4elVqK pfIhDK6yRln782PeH585E1GWOYSQB/Xbpqu70g5KnPYLzFah3TeMDfViJmCJukxh FU09hjEgNpw= =dutG -----END PGP SIGNATURE-----