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AUSCERT External Security Bulletin Redistribution
ESB-2019.2451.2
Cisco Application Policy Infrastructure Controller REST API
Privilege Escalation Vulnerability
17 January 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Application Policy Infrastructure Controller
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1889
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190703-ccapic-restapi
Revision History: January 17 2020: Updated fixed release information
July 4 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Application Policy Infrastructure Controller REST API Privilege
Escalation Vulnerability
Priority: High
Advisory ID: cisco-sa-20190703-ccapic-restapi
First Published: 2019 July 3 16:00 GMT
Last Updated: 2020 January 16 15:25 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvp64857
CVE-2019-1889
CWE-264
CVSS Score:
7.2 AV:N/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 REST API for software device management in Cisco
Application Policy Infrastructure Controller (APIC) Software could allow an
authenticated, remote attacker to escalate privileges to root on an
affected device.
The vulnerability is due to incomplete validation and error checking for
the file path when specific software is uploaded. An attacker could exploit
this vulnerability by uploading malicious software using the REST API. A
successful exploit could allow an attacker to escalate their privilege
level to root . The attacker would need to have the administrator role on
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-20190703-ccapic-restapi
Affected Products
o Vulnerable Products
This vulnerability affects Cisco APIC Software releases earlier than 3.2
(9b) and 4.1(2g).
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 Cisco
Application Policy Infrastructure Controller Enterprise Module (APIC-EM).
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
Cisco fixed this vulnerability in Cisco APIC Software releases 3.2(9b) and
later and 4.1(2g) and later.
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 Cisco would like to thank Frank Block from ERNW Research GmbH for reporting
this vulnerability.
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-20190703-ccapic-restapi
Revision History
o +---------+-----------------+------------------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+-----------------+------------------+--------+-----------------+
| | Updated fixed | Vulnerable | | |
| 1.1 | release | Products, Fixed | Final | 2020-January-16 |
| | information. | Software | | |
+---------+-----------------+------------------+--------+-----------------+
| 1.0 | Initial public | - | Final | 2019-July-03 |
| | release. | | | |
+---------+-----------------+------------------+--------+-----------------+
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