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AUSCERT External Security Bulletin Redistribution
ESB-2019.1757
Cisco MDS 9700 Series Multilayer Directors and Nexus 7000/7700 Series
Switches Software Patch Signature Verification Vulnerability
16 May 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco MDS 9700 Series Multilayer Directors
Cisco Nexus 7000/7700 Series Switches
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1808
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-spsv
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco MDS 9700 Series Multilayer Directors and Nexus 7000/7700 Series Switches
Software Patch Signature Verification Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190515-nxos-spsv
First Published: 2019 May 15 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvi42248
CVE-2019-1808
CWE-347
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 Signature Verification feature of Cisco NX-OS
Software could allow an authenticated, local attacker with
administrator-level credentials to install a malicious software patch on an
affected device.
The vulnerability is due to improper verification of digital signatures for
patch images. An attacker could exploit this vulnerability by loading an
unsigned software patch on an affected device. A successful exploit could
allow the attacker to boot a malicious software patch image.
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-20190515-nxos-spsv
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software:
MDS 9700 Series Multilayer Directors ^ 1
Nexus 7000 Series Switches
Nexus 7700 Series Switches
1. For the MDS products, only the MDS 9700 Series Multilayer Directors
are affected by this vulnerability. All other MDS 9000 Series
Multilayer Switches are not vulnerable.
For information about which Cisco NX-OS 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:
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches (except MDS 9700) ^ 1
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 3000 Series Switches
Nexus 3500 Platform Switches
Nexus 3600 Platform Switches
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
Nexus 9000 Series Switches in standalone NX-OS mode
Nexus 9500 R-Series Switching Platform
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
1. For the MDS products, only the MDS 9700 Series Multilayer Directors
are affected by this vulnerability. All other MDS 9000 Series
Multilayer Switches are not vulnerable.
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
No upgrade action is necessary for customers who have already applied a
recommended release to address the March 2019 Cisco FXOS and NX-OS Software
bundle. See Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication for a list of advisories in the
bundle.
Customers who have not applied a recommended release to address the March
2019 bundle are advised to upgrade to an appropriate release as indicated
in the applicable table in this section. In the following tables, the left
column lists Cisco NX-OS Software releases. The right column indicates the
first release that includes the fix for this vulnerability.
MDS 9700 Series Multilayer Directors: CSCvi42248
Cisco NX-OS Software First Fixed Release for This
Release Vulnerability
5.2 Not vulnerable
6.2 Not vulnerable
7.3 8.1(1a)
8.1 8.1(1a)
8.2 8.3(1)
8.3 Not vulnerable
Nexus 7000 and 7700 Series Switches: CSCvi42248
Cisco NX-OS Software First Fixed Release for This
Release Vulnerability
Prior to 6.2 Not vulnerable
6.2 Not vulnerable
7.2 7.3(3)D1(1)
7.3 7.3(3)D1(1)
8.0 8.2(3)
8.1 8.2(3)
8.2 8.2(3)
8.3 Not vulnerable
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190515-nxos-spsv
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2019-May-15 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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