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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--------------------
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