Summary

• 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-case-mvuln-dYrDPC6w

Affected Products

• 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

• 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

• There are no workarounds that address these vulnerabilities.

Fixed Software

• 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 Release	First Fixed Release for These Vulnerabilities
  1.1	1.1(3e)
  2.0	Not vulnerable

Exploitation and Public Announcements

• 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

• These vulnerabilities were found during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-case-mvuln-dYrDPC6w

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2021-FEB-24

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