Cisco Adaptive Security Appliance and Firepower Threat Defense Software VPN Web Client Services Cross-Site Scripting Vulnerabilities – Source:sec.cloudapps.cisco.com

Medium

Summary

• Multiple vulnerabilities in the VPN web client services feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a browser that is accessing an affected device.

  These vulnerabilities are due to improper validation of user-supplied input to application endpoints. An attacker could exploit these vulnerabilities by persuading a user to follow a link designed to submit malicious input to the affected application. A successful exploit could allow the attacker to execute arbitrary HTML or script code in the browser in the context of the web services page.

  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-asaftd-xss-yjj7ZjVq

  This advisory is part of the October 2024 release of the Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: October 2024 Semiannual Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.

Affected Products

• At the time of publication, these vulnerabilities affected Cisco products if they were running a vulnerable release of the following Cisco software:

  • ASA Software with Cisco AnyConnect VPN or Clientless SSL VPN enabled
  • FTD Software with Cisco AnyConnect VPN enabled

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

  Determine the Cisco ASA Software Configuration

  To determine whether Cisco ASA Software has a vulnerable feature enabled, use the show-running-config CLI command. In the following table, the left column lists vulnerable Cisco ASA Software features. The right column indicates the basic configuration for each feature from the show running-config CLI command. A device is affected by these vulnerabilities if it is running a vulnerable release and has one of these features enabled.

  Cisco ASA Feature	Vulnerable Configuration
  AnyConnect Internet Key Exchange Version 2 Remote Access (with client services)	crypto ikev2 enable client-services port
  AnyConnect SSL VPN	webvpn enable
  Clientless SSL VPN	webvpn enable

  Determine the Cisco FTD Software Configuration

  To determine whether Cisco FTD Software has a vulnerable feature enabled, use the show-running-config CLI command. In the following table, the left column lists vulnerable Cisco FTD Software features. The right column indicates the basic configuration for each feature from the show running-config CLI command. A device is affected by these vulnerabilities if it is running a vulnerable release and has one of these features enabled.

  Cisco FTD Feature	Vulnerable Configuration
  AnyConnect Internet Key Exchange Version 2 Remote Access (with client services)1,2	crypto ikev2 enable client-services port
  AnyConnect SSL VPN1,2	webvpn enable

  1. Remote Access VPN features were introduced in Cisco FTD Software Release 6.2.2.

  2. To enable Remote Access VPN features in Cisco Secure Firewall Management Center (FMC), formerly Firepower Management Center Software, choose Devices > VPN > Remote Access. To enable Remote Access VPN features in Cisco Firepower Device Manager (FDM), choose Remote Access VPN.

  Only products listed in the Vulnerable Products section of this advisory are known to be affected by these vulnerabilities.

  Cisco has confirmed that these vulnerabilities do not affect Cisco FMC Software.

Workarounds

• There are no workarounds that address these vulnerabilities.

Fixed Software

• 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.

  Cisco ASA, FMC, and FTD Software

  To help customers determine their exposure to vulnerabilities in Cisco ASA, FMC, and FTD Software, Cisco provides the Cisco Software Checker. This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory (“First Fixed”). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities that are described in all the advisories that the Software Checker identifies (“Combined First Fixed”).

  To use the tool, go to the Cisco Software Checker page and follow the instructions. Alternatively, use the following form to search for vulnerabilities that affect a specific software release. To use the form, follow these steps:

  1. Choose which advisories the tool will search-all advisories, only advisories with a Critical or High Security Impact Rating (SIR), or only this advisory.
  2. Choose the appropriate software.
  3. Choose the appropriate platform.
  4. Enter a release number-for example, 9.16.2.11 for Cisco ASA Software or 6.6.7 for Cisco FTD Software.
  5. Click Check.

  Note: For Cisco 3000 Series Industrial Security Appliances (ISAs) that are running Cisco ASA Software, Cisco ASA Software Release 9.16.4.67 has been deferred and replaced by Release 9.16.4.70.

  For instructions on upgrading a Cisco FTD device, see the appropriate Cisco FMC upgrade guide.

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

• CVE-2024-20341: Cisco would like to thank Amit Laish and Eedo Shapira of GE Vernova for reporting this vulnerability.

  CVE-2024-20382: This vulnerability was found by Arunesh Shukla of Cisco during internal security testing.

Cisco Security Vulnerability Policy

• 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.

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Related to This Advisory

• Cisco Event Response: October 2024 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication

  Cross-Site Scripting

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-yjj7ZjVq

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	–	Final	2024-OCT-23

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