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AUSCERT External Security Bulletin Redistribution
ESB-2018.1219
Cisco UCS Director Virtual Machine Information Disclosure
Vulnerability for End User Portal
19 April 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco UCS Director
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0238
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-uscd
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Cisco UCS Director Virtual Machine Information Disclosure Vulnerability for End
User Portal
Critical
Advisory ID: cisco-sa-20180418-uscd
First Published: 2018 April 18 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvh53501
CVE-2018-0238
CWE-287
CVSS Score:
Base 9.1[blue-squar]Click Icon to Copy Verbose Score
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the role-based resource checking functionality of the
Cisco Unified Computing System (UCS) Director could allow an authenticated,
remote attacker to view unauthorized information for any virtual machine in
the UCS Director end-user portal and perform any permitted operations on
any virtual machine. The permitted operations can be configured for the end
user on the virtual machines with either of the following settings:
- The virtual machine is associated to a Virtual Data Center (VDC) that
has an end user self-service policy attached to the VDC.
- The end user role has VM Management Actions settings configured under
User Permissions. This is a global configuration, so all the virtual
machines visible in the end-user portal will have the VM management
actions available.
The vulnerability is due to improper user authentication checks. An
attacker could exploit this vulnerability by logging in to the UCS Director
with a modified username and valid password. A successful exploit could
allow the attacker to gain visibility into and perform actions against all
virtual machines in the UCS Director end-user portal of the affected
system.
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-20180418-uscd
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Unified Computing System (UCS) Director
releases 6.0 and 6.5 prior to patch 3 that are in a default configuration.
This vulnerability can be exploited via the web interface (GUI). The Rest
API interface is not affected.
Both locally authenticated and LDAP-authenticated accounts can be used to
exploit this vulnerability.
Products Confirmed Not Vulnerable
Although this vulnerability does not affect the Cisco Integrated Management
Controller (IMC) Supervisor, the same modified login can be used. However,
the login does not expose any unintended data.
Cisco has confirmed that this vulnerability does not affect the following
products:
- Cisco Unified Computing System Director Releases prior to 6.0
- Cisco Unified Computing System Director Express for Big Data
Details
o An authenticated user who logs in to the system and exploits this
vulnerability will have visibility into all virtual machines shown in the
Virtual Resources menu. The actions that a user may perform against the
virtual machines will depend on the actions that are permitted in either of
the following:
- The assigned end user self-service policy for the VDC in Policies >
Virtual/Hypervisor Policies > Service Delivery > End User Self-Service
Policy
- The user's role as defined in System > User Roles > User Permissions >
VM Management Actions
If the UCS Director is configured in Service Provider Feature mode, an
authenticated user who logs in to the system and exploits this
vulnerability will have visibility into all virtual machines shown in the
Virtual Resources menu, including those from other tenants.
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
This vulnerability is fixed in the Cisco UCS Director 6.5.0.3 upgrade
patch. The patch can be downloaded from the Software Center on Cisco.com by
navigating to Products > Servers - Unified Computing > UCS Director > UCS
Director 6.5 > UCS Director Virtual Appliance Software-6.
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 the resolution of a Cisco TAC support
case.
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-20180418-uscd
Revision History
o
+----------+----------------------------+----------+---------+----------------+
| Version | Description | Section | Status | Date |
+----------+----------------------------+----------+---------+----------------+
| 1.0 | Initial public release. | -- | Final | 2018-April-18 |
+----------+----------------------------+----------+---------+----------------+
Show Less
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Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
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.
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