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AUSCERT External Security Bulletin Redistribution
ESB-2017.2066
Cisco Application Policy Infrastructure Controller Custom
Binary Privilege Escalation Vulnerability
17 August 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Application Policy Infrastructure Controller
Publisher: Cisco Systems
Operating System: Network Appliance
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-6768
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170816-apic2
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Cisco Security Advisory
Cisco Application Policy Infrastructure Controller Custom Binary Privilege Escalation Vulnerability
High
Advisory ID: cisco-sa-20170816-apic2
First Published: 2017 August 16 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvc96087
CVSS Score: Base 7.8, Temporal 7.8
CVE-2017-6768
CWE-264
Summary
A vulnerability in the build procedure for certain executable system
files installed at boot time on Cisco Application Policy Infrastructure
Controller (APIC) devices could allow an authenticated, local attacker to
gain root-level privileges.
The vulnerability is due to a custom executable system file that was built
to use relative search paths for libraries without properly validating
the library to be loaded. An attacker could exploit this vulnerability
by authenticating to the device and loading a malicious library that can
escalate the privilege level. A successful exploit could allow the attacker
to gain root-level privileges and take full control of the device. The
attacker must have valid user credentials to log in to 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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170816-apic2
Affected Products
Vulnerable Products
This vulnerability affects Cisco APIC if running software release 1.0(1e)
until the first fixed release. For information about fixed software releases,
consult the Fixed Software section of this advisory.
To determine which release of APIC is running on a device, administrators
can use the CLI command show version. The following example shows the
output of the command for a device running software release 1.2(3m):
APIC# show version
Role Id Name Version
- ---------- ---------- ------------------------ --------------------
controller 1 APIC 1.2(3m)
.
.
.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Application
Policy Infrastructure Controller Enterprise Module (APIC-EM).
Workarounds
There are no workarounds that address this vulnerability.
Fixed Software
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:
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.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:
http://www.cisco.com/en/US/support/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 should upgrade to an appropriate release as indicated in the table
in this section. To help ensure a complete upgrade solution, consider that
this advisory is part of a collection that includes the following advisories:
cisco-sa-20170816-apic1: Cisco Application Policy Infrastructure Controller
SSH Privilege Escalation Vulnerability
cisco-sa-20170816-apic2: Cisco Application Policy Infrastructure Controller
Custom Binary Privilege Escalation Vulnerability
In the following table, the left column lists major releases of Cisco
software. The center column indicates whether a major release is affected
by the vulnerability described in this advisory and the first minor release
that includes the fix for this vulnerability. The right column indicates
whether a major release is affected by all the vulnerabilities described
in this collection of advisories and the current recommended release for
those vulnerabilities.
Cisco Application Policy First Fixed Release Recommended Release for This Vulnerability
Infrastructure Controller for This Vulnerability and All Vulnerabilities Described in the
Collection of Advisories
Prior to 2.0 Vulnerable; migrate to 2.2(2e) 2.2(2e)
2.0 Vulnerable; migrate to 2.2(2e) 2.2(2e)
2.1 Vulnerable; migrate to 2.2(2e) 2.2(2e)
2.2 2.2(2e) 2.2(2e)
2.3 2.3(1f) 2.3(1f)
3.0 (future release) Not Vulnerable Not Vulnerable
The software updates can be downloaded from the Software Center on Cisco.com
by navigating to Products > Cloud and Systems Management > Policy and
Automation Controllers > Application Policy Infrastructure Controller (APIC).
Exploitation and Public Announcements
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
This vulnerability was found and reported to Cisco by Security Researcher
Mgr. Lubomir Vesely.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170816-apic2
Revision History
Version Description Section Status Date
1.0 Initial public release. -- Final 2017-August-16
Legal Disclaimer
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.
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