Summary

• Multiple vulnerabilities in the Cisco Expressway Series could allow an unauthenticated, remote attacker to conduct cross-site request forgery (CSRF) attacks, which could allow the attacker to perform arbitrary actions on an affected device.

  Note: Cisco Expressway Series refers to Cisco Expressway Control (Expressway-C) devices and Cisco Expressway Edge (Expressway-E) devices.

  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-expressway-csrf-KnnZDMj3

Affected Products

• Vulnerable Products

  CVE-2024-20254 and CVE-2024-20255: These vulnerabilities affect Cisco Expressway Series devices in the default configuration.

  CVE-2024-20252: This vulnerability affects Cisco Expressway Series devices if the cluster database (CDB) API feature has been enabled. This feature is disabled by default in Cisco Expressway Series releases 14.2 and later. In releases earlier than Cisco Expressway Series Release 14.2, the cluster database (CDB) API feature is enabled by default and cannot be disabled.

  For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory.

  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 another vulnerability. In addition, a software release that is affected by one of the vulnerabilities may not be affected by the other vulnerabilities.

  Details about the vulnerabilities are as follows:

  CVE-2024-20252 and CVE-2024-20254: Cisco Expressway Series Cross-Site Request Forgery Vulnerabilities

  Two vulnerabilities in the API of Cisco Expressway Series devices could allow an unauthenticated, remote attacker to conduct CSRF attacks on an affected system.

  These vulnerabilities are due to insufficient CSRF protections for the web-based management interface of an affected system. An attacker could exploit these vulnerabilities by persuading a user of the API to follow a crafted link. A successful exploit could allow the attacker to perform arbitrary actions with the privilege level of the affected user. If the affected user has administrative privileges, these actions could include modifying the system configuration and creating new privileged accounts.

  Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

  Bug ID(s): CSCwa25099 and CSCwa25100
  CVE ID: CVE-2024-20252 and CVE-2024-20254
  Security Impact Rating (SIR): Critical
  CVSS Base Score: 9.6
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

  CVE-2024-20255: Cisco Expressway Series Cross-Site Request Forgery Vulnerability

  A vulnerability in the API of the Cisco Expressway Series could allow an unauthenticated, remote attacker to conduct a CSRF attack on an affected system.

  This vulnerability is due to insufficient CSRF protections for the web-based management interface of an affected system. An attacker could exploit this vulnerability by persuading a user of the API to follow a crafted link. A successful exploit could allow the attacker to perform arbitrary actions with the privilege level of the affected user. If the affected user has administrative privileges, these actions could include overwriting system configuration settings, which could prevent the system from processing calls properly and result in a denial of service (DoS) condition.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwa25074
  CVE ID: CVE-2024-20255
  Security Impact Rating (SIR): High
  CVSS Base Score: 8.2
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:L

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 with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels.

  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.

  The Cisco Support and Downloads page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool.

  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

  In the following table, the left column lists Cisco software releases. The right column indicates whether a release is affected by the vulnerabilities that are described in this advisory and the first release that includes the fix for these vulnerabilities. Customers are advised to upgrade to an appropriate fixed software release as indicated in this section.

  Cisco Expressway Series Release	First Fixed Release
  Earlier than 14	Migrate to a fixed release.
  14	14.3.41
  15	15.0.01

  1. To enable the complete fix, run the xconfiguration Security CSRFProtection status : "Enabled" command, as detailed in the Cisco Expressway Administrator Guide.

  Cisco TelePresence Video Communication Server

  Cisco TelePresence Video Communication Server (VCS) has reached its end-of-support date and is no longer included in Cisco Expressway Series advisories. Cisco has not released and will not release software updates for Cisco TelePresence VCS to address the vulnerabilities that are described in this advisory. Customers are advised to refer to the end-of-life notice for Cisco TelePresence VCS:

  https://www.cisco.com/c/en/us/products/collateral/unified-communications/telepresence-video-communication-server-vcs/eos-eol-notice-c51-743969.html

  When considering a software migration, 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 new software will be sufficient for their network needs, that new devices contain sufficient memory, and that current hardware and software configurations will continue to be supported properly by the new product. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

  The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.

Exploitation and Public Announcements

• The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

Source

• CVE-2024-20252 and CVE-2024-20254: These vulnerabilities were found during internal security testing by Jason Crowder of the Cisco Advanced Security Initiatives Group (ASIG).

  CVE-2024-20255: This vulnerability was found during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-expressway-csrf-KnnZDMj3

Revision History

• Version	Description	Section	Status	Date
  1.1	Clarified vulnerable product information and fixed releases.	Vulnerable Products and Fixed Releases	Final	2024-FEB-12
  1.0	Initial public release.	-	Final	2024-FEB-07

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