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AUSCERT External Security Bulletin Redistribution
ESB-2021.0707
Cisco Application Services Engine Unauthorized Access Vulnerabilities
25 February 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Application Services Engine
Publisher: Cisco Systems
Operating System: Cisco
Virtualisation
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Create Arbitrary Files -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1396 CVE-2021-1393
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-case-mvuln-dYrDPC6w
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Cisco Application Services Engine Unauthorized Access Vulnerabilities
Priority: Critical
Advisory ID: cisco-sa-case-mvuln-dYrDPC6w
First Published: 2021 February 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvw14124 CSCvw55819
CVE Names: CVE-2021-1393 CVE-2021-1396
CWEs: CWE-306 CWE-552
Summary
o Multiple vulnerabilities in Cisco Application Services Engine could allow
an unauthenticated, remote attacker to gain privileged access to host-level
operations or to learn device-specific information, create diagnostic
files, and make limited configuration changes.
For more information about these vulnerabilities, see the Details section
of this advisory.
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-case-mvuln-dYrDPC6w
Affected Products
o Vulnerable Products
These vulnerabilities affect Cisco Application Services Engine Software
releases 1.1(3d) and earlier.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Details
o The vulnerabilities are not dependent on one another. Exploitation of one
of the vulnerabilities is not required to exploit the other vulnerability.
In addition, a software release that is affected by one of the
vulnerabilities may not be affected by the other vulnerability.
Details about the vulnerabilities are as follows:
CVE-2021-1393: Cisco Application Services Engine Unauthorized Service
Access Vulnerability
A vulnerability in Cisco Application Services Engine could allow an
unauthenticated, remote attacker to access a privileged service on an
affected device.
The vulnerability is due to insufficient access controls for a service
running in the Data Network. An attacker could exploit this vulnerability
by sending crafted TCP requests to a specific service. A successful exploit
could allow the attacker to have privileged access to run containers or
invoke host-level operations.
Bug ID(s): CSCvw14124
CVE ID: CVE-2021-1393
Security Impact Rating (SIR): Critical
CVSS Base Score: 9.8
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
CVE-2021-1396: Cisco Application Services Engine Unauthorized API Access
Vulnerability
A vulnerability in Cisco Application Services Engine could allow an
unauthenticated, remote attacker access to a specific API on an affected
device.
The vulnerability is due to insufficient access controls for an API running
in the Data Network. An attacker could exploit this vulnerability by
sending crafted HTTP requests to the affected API. A successful exploit
could allow the attacker to learn device-specific information, create tech
support files in an isolated volume, and make limited configuration
changes.
Bug ID(s): CSCvw55819
CVE ID: CVE-2021-1396
Security Impact Rating (SIR): Medium
CVSS Base Score: 6.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Cisco Application Services Engine Networks
Cisco Application Services Engine is deployed as a cluster, connecting each
service node to two networks:
Management Network using management interfaces. (mgmt0, mgmt1)
Data Network using the fabric interfaces. (fabric0, fabric1)
Management Network provides the following services:
Accessing the Cisco Application Services Engine GUI.
Accessing the CLI over SSH.
DNS and NTP.
Firmware uploads.
InterSight device connector.
Data Network provides the following services:
Cisco Application Services Engine Clustering.
App to app communication.
Access to the management network of the Cisco ACI fabric.
All app to ACI fabric communications.
Workarounds
o There are no workarounds that address these vulnerabilities.
Fixed Software
o Cisco has released free software updates that address the vulnerabilities
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 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
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table:
Cisco Application Services Engine Software First Fixed Release for These
Release Vulnerabilities
1.1 1.1(3e)
2.0 Not vulnerable
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 vulnerabilities that are
described in this advisory.
Source
o These vulnerabilities were 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-case-mvuln-dYrDPC6w
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-FEB-24 |
+----------+---------------------------+----------+--------+--------------+
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