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AUSCERT External Security Bulletin Redistribution
ESB-2019.0700
Cisco NX-OS Software Privilege Escalation Vulnerability
7 March 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco NX-OS
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Administrator Compromise -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1604 CVE-2019-1603 CVE-2019-1602
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-privesc
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-escalation
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-privesca
Comment: This bulletin contains three (3) security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco NX-OS Software Privilege Escalation Vulnerability
Priority: High
Advisory ID: cisco-sa-20190306-nxos-privesc
First Published: 2019 March 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvh24810 CSCvj00330
CVE-2019-1603
CWE-285
CVSS Score:
7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the CLI of Cisco NX-OS Software could allow an
authenticated, local attacker to escalate lower-level privileges to the
administrator level.
The vulnerability is due to insufficient authorization enforcement. An
attacker could exploit this vulnerability by authenticating to the targeted
device and executing commands that could lead to elevated privileges. A
successful exploit could allow an attacker to make configuration changes to
the system as administrator .
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-20190306-nxos-privesc
This advisory is part of the March 2019 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication, which includes 25 Cisco Security
Advisories that describe 26 vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: March 2019 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software:
Nexus 3000 Series Switches
Nexus 3500 Platform Switches
Nexus 3600 Platform Switches
Nexus 9000 Series Switches in standalone NX-OS mode
Nexus 9500 R-Series Line Cards and Fabric Modules
For information about which Cisco NX-OS Software releases are vulnerable,
see the Fixed Software section of this advisory.
Determining the Cisco NX-OS Software Release
Administrators can check the release of Cisco NX-OS Software that is
running on a device by using the show version command in the device CLI.
The following example shows the output of this command on a device that is
running Cisco NX-OS Software Release 7.0(3)I5(1) :
nxos-switch# show version
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
Copyright (C) 2002-2016, Cisco and/or its affiliates.
All rights reserved.
The copyrights to certain works contained in this software are
owned by other third parties and used and distributed under their own
licenses, such as open source. This software is provided "as is," and
unless otherwise stated, there is no warranty, express or implied,
including but not limited to warranties of merchantability and fitness
for a particular purpose. Certain components of this software are
licensed under the GNU General Public License (GPL) version 2.0 or
GNU General Public License (GPL) version 3.0 or the GNU
Lesser General Public License (LGPL) Version 2.1 or
Lesser General Public License (LGPL) Version 2.0.
A copy of each such license is available at
http://www.opensource.org/licenses/gpl-2.0.php and
http://opensource.org/licenses/gpl-3.0.html and
http://www.opensource.org/licenses/lgpl-2.1.php and
http://www.gnu.org/licenses/old-licenses/library.txt.
Software
BIOS: version 07.57
NXOS: version 7.0(3)I5(1) [build 7.0(3)I5(0.9)]
BIOS compile time: 06/29/2016
NXOS image file is: bootflash:///nxos.7.0.3.I5.0.9.bin
NXOS compile time: 8/1/2016 23:00:00 [08/02/2016 00:30:32]
.
.
.
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:
Firepower 2100 Series
Firepower 4100 Series Next-Generation Firewalls
Firepower 9300 Security Appliance
MDS 9000 Series Multilayer Switches
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 2000 Series Fabric Extenders
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 7700 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
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
Customers are advised to upgrade to an appropriate release as indicated in
the applicable table in this section. To help ensure a complete upgrade
solution, customers should consider that this advisory is part of a bundled
publication. The following page provides a complete list of bundle
advisories: Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication .
In the following tables, the left column lists releases of Cisco FXOS
Software or Cisco NX-OS Software. The center column indicates whether a
release is affected by the vulnerability described in this advisory and the
first release that includes the fix for this vulnerability. The right
column indicates whether a release is affected by all the vulnerabilities
described in this bundle and which release includes fixes for those
vulnerabilities.
Although the releases listed in the right column of each table include
fixes for the vulnerabilities, the fix related to the Cisco NX-OS Software
Image Signature Verification Vulnerability requires a BIOS upgrade as part
of the software upgrade. Customers who are upgrading the software for any
of the following products are advised to refer to this advisory for further
details about the BIOS upgrade and affected product IDs and BIOS versions:
Nexus 3000 Series Switches
Nexus 9000 Series Fabric Switches in ACI mode
Nexus 9000 Series Switches in standalone NX-OS mode
Nexus 9500 R-Series Line Cards and Fabric Modules
Nexus 3000 Series Switches: CSCvh24810
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Prior to 7.0 7.0(3)I4(9) 7.0(3)I7(6)
(3)I4
7.0(3)I4 7.0(3)I4(9) 7.0(3)I7(6)
7.0(3)I5 7.0(3)I7(3) 7.0(3)I7(6)
7.0(3)I6 7.0(3)I7(3) 7.0(3)I7(6)
7.0(3)I7 7.0(3)I7(3) 7.0(3)I7(6)
9.2 Not vulnerable 9.2(2)
Nexus 3500 Platform Switches: CSCvh24810
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Prior to 6.0 Not vulnerable 6.0(2)A8(11)
(2)A8
6.0(2)A8 Not vulnerable 6.0(2)A8(11)
7.0(3) 7.0(3)I7(3) 7.0(3)I7(6)
9.2 Not vulnerable 9.2(2)
Nexus 3600 Platform Switches: CSCvj00330
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
7.0(3)F3 7.0(3)F3(5) 7.0(3)F3(5)
9.2 Not vulnerable 9.2(2)
Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCvh24810
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Prior to 7.0 7.0(3)I4(9) 7.0(3)I7(6)
(3)I4
7.0(3)I4 7.0(3)I4(9) 7.0(3)I7(6)
7.0(3)I5 7.0(3)I7(3) 7.0(3)I7(6)
7.0(3)I6 7.0(3)I7(3) 7.0(3)I7(6)
7.0(3)I7 7.0(3)I7(3) 7.0(3)I7(6)
9.2 Not vulnerable 9.2(2)
Nexus 9500 R-Series Line Cards and Fabric Modules: CSCvj00330
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
7.0(3)F1 7.0(3)F3(5) 7.0(3)F3(5)
7.0(3)F2 7.0(3)F3(5) 7.0(3)F3(5)
7.0(3)F3 7.0(3)F3(5) 7.0(3)F3(5)
9.2 Not vulnerable 7.0(3)F3(5)
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, administrators can refer to the following Recommended
Releases documents. If a security advisory recommends a later release,
Cisco recommends following the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series and 3500 Series Switches
Cisco Nexus 5000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
For help determining the best Cisco NX-OS Software release for Cisco UCS,
refer to the Recommended Releases documents in the release notes for the
device.
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: March 2019 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190306-nxos-privesc
Revision History
o +---------+--------------------------+---------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+----------------+
| 1.0 | Initial public release. | - | Final | 2019-March-06 |
+---------+--------------------------+---------+--------+----------------+
==============================================================================
Cisco NX-OS Software Privilege Escalation Vulnerability
Priority: High
Advisory ID: cisco-sa-20190306-nxos-escalation
First Published: 2019 March 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvj59009 CSCvk70659
CVE-2019-1602
CWE-264
CVSS Score:
7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the filesystem permissions of Cisco NX-OS Software could
allow an authenticated, local attacker to access sensitive data that could
be used to elevate their privileges to administrator .
The vulnerability is due to improper implementation of filesystem
permissions. An attacker could exploit this vulnerability by logging in to
the CLI of an affected device, accessing a specific file, and leveraging
this information to authenticate to the NX-API server. A successful exploit
could allow an attacker to make configuration changes as administrator .
Note : NX-API is disabled by default.
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-20190306-nxos-escalation
This advisory is part of the March 2019 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication, which includes 25 Cisco Security
Advisories that describe 26 vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: March 2019 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software:
Nexus 3000 Series Switches
Nexus 3500 Platform Switches
Nexus 3600 Platform Switches
Nexus 9000 Series Switches in standalone NX-OS mode
Nexus 9500 R-Series Line Cards and Fabric Modules
For information about which Cisco NX-OS Software releases are vulnerable,
see the Fixed Software section of this advisory.
Determining the Cisco NX-OS Software Release
Administrators can check the release of Cisco NX-OS Software that is
running on a device by using the show version command in the device CLI.
The following example shows the output of this command on a device that is
running Cisco NX-OS Software Release 7.0(3)I5(1) :
nxos-switch# show version
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
Copyright (C) 2002-2016, Cisco and/or its affiliates.
All rights reserved.
The copyrights to certain works contained in this software are
owned by other third parties and used and distributed under their own
licenses, such as open source. This software is provided "as is," and
unless otherwise stated, there is no warranty, express or implied,
including but not limited to warranties of merchantability and fitness
for a particular purpose. Certain components of this software are
licensed under the GNU General Public License (GPL) version 2.0 or
GNU General Public License (GPL) version 3.0 or the GNU
Lesser General Public License (LGPL) Version 2.1 or
Lesser General Public License (LGPL) Version 2.0.
A copy of each such license is available at
http://www.opensource.org/licenses/gpl-2.0.php and
http://opensource.org/licenses/gpl-3.0.html and
http://www.opensource.org/licenses/lgpl-2.1.php and
http://www.gnu.org/licenses/old-licenses/library.txt.
Software
BIOS: version 07.57
NXOS: version 7.0(3)I5(1) [build 7.0(3)I5(0.9)]
BIOS compile time: 06/29/2016
NXOS image file is: bootflash:///nxos.7.0.3.I5.0.9.bin
NXOS compile time: 8/1/2016 23:00:00 [08/02/2016 00:30:32]
.
.
.
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:
Firepower 2100 Series
Firepower 4100 Series Next-Generation Firewalls
Firepower 9300 Security Appliance
MDS 9000 Series Multilayer Switches
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 2000 Series Fabric Extenders
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 7700 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Details
o The vulnerability affects only devices running Cisco NX-OS Software that
are configured with the NX-API feature enabled.
To determine whether a device running Cisco NX-OS Software is configured
with NX-API enabled, administrators can use the show feature | include
nxapi command from the NX-OS CLI and verify that it is enabled. The
following example shows the NX-API feature enabled on a device running
Cisco NX-OS Software:
nxos-switch# show feature | include nxapi
nxapi 1 enabled
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
Customers are advised to upgrade to an appropriate release as indicated in
the applicable table in this section. To help ensure a complete upgrade
solution, customers should consider that this advisory is part of a bundled
publication. The following page provides a complete list of bundle
advisories: Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication .
In the following tables, the left column lists releases of Cisco FXOS
Software or Cisco NX-OS Software. The center column indicates whether a
release is affected by the vulnerability described in this advisory and the
first release that includes the fix for this vulnerability. The right
column indicates whether a release is affected by all the vulnerabilities
described in this bundle and which release includes fixes for those
vulnerabilities.
Although the releases listed in the right column of each table include
fixes for the vulnerabilities, the fix related to the Cisco NX-OS Software
Image Signature Verification Vulnerability requires a BIOS upgrade as part
of the software upgrade. Customers who are upgrading the software for any
of the following products are advised to refer to this advisory for further
details about the BIOS upgrade and affected product IDs and BIOS versions:
Nexus 3000 Series Switches
Nexus 9000 Series Fabric Switches in ACI mode
Nexus 9000 Series Switches in standalone NX-OS mode
Nexus 9500 R-Series Line Cards and Fabric Modules
Nexus 3000 Series Switches: CSCvj59009
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Prior to 7.0 Not vulnerable 7.0(3)I7(6)
(3)I4
7.0(3)I4 Not vulnerable 7.0(3)I7(6)
7.0(3)I5 7.0(3)I7(4) 7.0(3)I7(6)
7.0(3)I6 7.0(3)I7(4) 7.0(3)I7(6)
7.0(3)I7 7.0(3)I7(4) 7.0(3)I7(6)
9.2 Not vulnerable 9.2(2)
Nexus 3500 Platform Switches: CSCvj59009
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
6.0 Not vulnerable 6.0(2)A8(11)
7.0(3) 7.0(3)I7(4) 6.0(2)A8(11)
9.2(1) Not vulnerable 9.2(2)
Nexus 3600 Platform Switches: CSCvk70659
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
7.0(3)F3 7.0(3)F3(3c) ^1 7.0(3)F3(5)
9.2(1) Not vulnerable 9.2(2)
^ 1 This vulnerability is not fixed in 7.0(3)F3(4) but is fixed in 7.0(3)F3
(5).
Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCvj59009
Cisco First Fixed Release First Fixed Release for All
NX-OS for This Vulnerability Vulnerabilities Described in the Bundle
Software of Advisories
Prior to Not vulnerable 7.0(3)I7(6)
7.0(3)I4
7.0(3)I4 Not vulnerable 7.0(3)I7(6)
7.0(3)I5 7.0(3)I7(4) 7.0(3)I7(6)
7.0(3)I6 7.0(3)I7(4) 7.0(3)I7(6)
7.0(3)I7 7.0(3)I7(4) 7.0(3)I7(6)
9.2 Not vulnerable 9.2(2)
Nexus 9500 R-Series Line Cards and Fabric Modules : CSCvk70659
Cisco First Fixed Release First Fixed Release for All
NX-OS for This Vulnerability Vulnerabilities Described in the Bundle
Software of Advisories
7.0(3)F1 7.0(3)F3(3c) ^1 7.0(3)F3(5)
7.0(3)F2 7.0(3)F3(3c) ^1 7.0(3)F3(5)
7.0(3)F3 7.0(3)F3(3c) ^1 7.0(3)F3(5)
9.2(1) Not vulnerable 9.2(2)
^ 1 This vulnerability is not fixed in 7.0(3)F3(4) but is fixed in 7.0(3)F3
(5).
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, administrators can refer to the following Recommended
Releases documents. If a security advisory recommends a later release,
Cisco recommends following the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series and 3500 Series Switches
Cisco Nexus 5000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
For help determining the best Cisco NX-OS Software release for Cisco UCS,
refer to the Recommended Releases documents in the release notes for the
device.
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: March 2019 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190306-nxos-escalation
Revision History
o +---------+--------------------------+---------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+----------------+
| 1.0 | Initial public release. | - | Final | 2019-March-06 |
+---------+--------------------------+---------+--------+----------------+
==============================================================================
Cisco NX-OS Software Privilege Escalation Vulnerability
Priority: High
Advisory ID: cisco-sa-20190306-nxos-privesca
First Published: 2019 March 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvi53896 CSCvk70990 CSCvm35213 CSCvm35215
CVE-2019-1604
CWE-285
CVSS Score:
7.3 AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the user account management interface of Cisco NX-OS
Software could allow an authenticated, local attacker to gain elevated
privileges on an affected device.
The vulnerability is due to an incorrect authorization check of user
accounts and their associated Group ID (GID). An attacker could exploit
this vulnerability by taking advantage of a logic error that will permit
the use of higher privileged commands than what is necessarily assigned. A
successful exploit could allow an attacker to execute commands with
elevated privileges on the underlying Linux shell of an affected device.
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-20190306-nxos-privesca
This advisory is part of the March 2019 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication, which includes 25 Cisco Security
Advisories that describe 26 vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: March 2019 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software:
Nexus 3000 Series Switches
Nexus 3500 Series Switches
Nexus 3600 Platform Switches
Nexus 7000 Series Switches
Nexus 7700 Series Switches
Nexus 9000 Series switches in standalone NX-OS mode
Nexus 9500 R-Series Line Cards and Fabric Modules
For information about which Cisco NX-OS Software releases are vulnerable,
see the Fixed Software section of this advisory.
Determining the Cisco NX-OS Software Release
Administrators can check the release of Cisco NX-OS Software that is
running on a device by using the show version command in the device CLI.
The following example shows the output of this command on a device that is
running Cisco NX-OS Software Release 7.0(3)I5(1) :
nxos-switch# show version
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
Copyright (C) 2002-2016, Cisco and/or its affiliates.
All rights reserved.
The copyrights to certain works contained in this software are
owned by other third parties and used and distributed under their own
licenses, such as open source. This software is provided "as is," and
unless otherwise stated, there is no warranty, express or implied,
including but not limited to warranties of merchantability and fitness
for a particular purpose. Certain components of this software are
licensed under the GNU General Public License (GPL) version 2.0 or
GNU General Public License (GPL) version 3.0 or the GNU
Lesser General Public License (LGPL) Version 2.1 or
Lesser General Public License (LGPL) Version 2.0.
A copy of each such license is available at
http://www.opensource.org/licenses/gpl-2.0.php and
http://opensource.org/licenses/gpl-3.0.html and
http://www.opensource.org/licenses/lgpl-2.1.php and
http://www.gnu.org/licenses/old-licenses/library.txt.
Software
BIOS: version 07.57
NXOS: version 7.0(3)I5(1) [build 7.0(3)I5(0.9)]
BIOS compile time: 06/29/2016
NXOS image file is: bootflash:///nxos.7.0.3.I5.0.9.bin
NXOS compile time: 8/1/2016 23:00:00 [08/02/2016 00:30:32]
.
.
.
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:
MDS 9000 Series Multilayer Switches
Firepower 2100 Series Firewalls
Firepower 4100 Series Next-Generation Firewalls
Firepower 9300 Security Appliance
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 2000 Series Fabric Extenders
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
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
Customers are advised to upgrade to an appropriate release as indicated in
the applicable table in this section. To help ensure a complete upgrade
solution, customers should consider that this advisory is part of a bundled
publication. The following page provides a complete list of bundle
advisories: Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication .
In the following tables, the left column lists releases of Cisco FXOS
Software or Cisco NX-OS Software. The center column indicates whether a
release is affected by the vulnerability described in this advisory and the
first release that includes the fix for this vulnerability. The right
column indicates whether a release is affected by all the vulnerabilities
described in this bundle and which release includes fixes for those
vulnerabilities.
Although the releases listed in the right column of each table include
fixes for the vulnerabilities, the fix related to the Cisco NX-OS Software
Image Signature Verification Vulnerability requires a BIOS upgrade as part
of the software upgrade. Customers who are upgrading the software for any
of the following products are advised to refer to this advisory for further
details about the BIOS upgrade and affected product IDs and BIOS versions:
Nexus 3000 Series Switches
Nexus 9000 Series Fabric Switches in ACI mode
Nexus 9000 Series Switches in standalone NX-OS mode
Nexus 9500 R-Series Line Cards and Fabric Modules
Nexus 3000 Series Switches: CSCvi53896
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Prior to 7.0 7.0(3)I4(9) 7.0(3)I7(6)
(3)I4
7.0(3)I4 7.0(3)I4(9) 7.0(3)I7(6)
7.0(3)I5 7.0(3)I7(5) 7.0(3)I7(6)
7.0(3)I6 7.0(3)I7(5) 7.0(3)I7(6)
7.0(3)I7 7.0(3)I7(5) 7.0(3)I7(6)
9.2 Not vulnerable 9.2(2)
Nexus 3500 Platform Switches: CSCvk70990
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Prior to 6.0 6.0(2)A8(11) 6.0(2)A8(11)
(2)A8
6.0(2)A8 6.0(2)A8(11) 6.0(2)A8(11)
7.0(3) 7.0(3)I7(5) 7.0(3)I7(6)
9.2 Not vulnerable 9.2(2)
Nexus 3600 Platform Switches: CSCvm35213
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
7.0(3)F3 7.0(3)F3(5) 7.0(3)F3(5)
9.2(1) Not vulnerable 9.2(2)
Nexus 7000 and 7700 Series Switches: CSCvm35215
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Prior to 6.2 6.2(22) 6.2(22)
6.2 6.2(22) 6.2(22)
7.2 Not vulnerable 8.2(3)
7.3 Not vulnerable 8.2(3)
8.0 Not vulnerable 8.2(3)
8.1 8.2(3) 8.2(3)
8.2 8.2(3) 8.2(3)
8.3 8.3(2) 8.3(2)
Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCvi53896
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Prior to 7.0 7.0(3)I4(9) 7.0(3)I4(9)
(3)I4
7.0(3)I4 7.0(3)I4(9) 7.0(3)I7(6)
7.0(3)I5 7.0(3)I7(5) 7.0(3)I7(6)
7.0(3)I6 7.0(3)I7(5) 7.0(3)I7(6)
7.0(3)I7 7.0(3)I7(5) 7.0(3)I7(6)
9.2 Not vulnerable 9.2(2)
Nexus 9500 R-Series Line Cards and Fabric Modules: CSCvm35213
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
7.0(3)F1 7.0(3)F3(5) 7.0(3)F3(5)
7.0(3)F2 7.0(3)F3(5) 7.0(3)F3(5)
7.0(3)F3 7.0(3)F3(5) 7.0(3)F3(5)
9.2 Not vulnerable 9.2(2)
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, administrators can refer to the following Recommended
Releases documents. If a security advisory recommends a later release,
Cisco recommends following the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series and 3500 Series Switches
Cisco Nexus 5000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
For help determining the best Cisco NX-OS Software release for Cisco UCS,
refer to the Recommended Releases documents in the release notes for the
device.
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: March 2019 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190306-nxos-privesca
Revision History
o +---------+--------------------------+---------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+----------------+
| 1.0 | Initial public release. | - | Final | 2019-March-06 |
+---------+--------------------------+---------+--------+----------------+
- --------------------------END INCLUDED TEXT--------------------
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