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AUSCERT External Security Bulletin Redistribution
Cisco Unified Computing System Fabric Interconnect root
Privilege Escalation Vulnerability
29 August 2019
AusCERT Security Bulletin Summary
Product: UCS Fabric Interconnect
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
CVE Names: CVE-2019-1966
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Cisco Unified Computing System Fabric Interconnect root Privilege Escalation
Advisory ID: cisco-sa-20190828-ucs-privescalation
First Published: 2019 August 28 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvm77243CSCvm80093
o A vulnerability in a specific CLI command within the local management (
local-mgmt ) context for Cisco UCS Fabric Interconnect Software could allow
an authenticated, local attacker to gain elevated privileges as the root
user on an affected device.
The vulnerability is due to extraneous subcommand options present for a
specific CLI command within the local-mgmt context. An attacker could
exploit this vulnerability by authenticating to an affected device,
entering the local-mgmt context, and issuing a specific CLI command and
submitting user input. A successful exploit could allow the attacker to
execute arbitrary operating system commands as root on an affected device.
The attacker would need to have valid user credentials for the 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:
This advisory is part of the August 2019 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication, which includes five Cisco Security
Advisories that describe five vulnerabilities. For a complete list of the
advisories and links to them, see Cisco Event Response: August 2019 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco UCS Fabric Interconnect Software:
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
For information about which Cisco UCS Fabric Interconnect 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
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000 Virtual Edge for VMware vSphere
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 7000 Series Switches
Nexus 7700 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
Nexus 9000 Series Switches in standalone NX-OS mode
Nexus 9500 R-Series Switching Platform
o There are no workarounds that address this vulnerability.
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/
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
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:
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
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: August 2019 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication .
In the following table(s), 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
UCS 6200, 6300, and 6400 Series Fabric Interconnects: CSCvm77243 and
Cisco NX-OS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
Earlier than 3.2(3l) ^1 No fix at this time
3.2 3.2(3l) ^1 No fix at this time
4.0 4.0(2a) No fix at this time
1. This release is scheduled for September 2019.
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
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.
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
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Final | 2019-August-28 |
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