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URL:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftdvirtual-dos-MuenGnYR
Submission: On October 23 via api (October 23rd 2024, 4:52:51 pm UTC) from TR — Scanned from DE

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Text Content

Home / Cisco Security / Security Advisories

CISCO SECURITY ADVISORY

CISCO ADAPTIVE SECURITY VIRTUAL APPLIANCE AND SECURE FIREWALL THREAT DEFENSE
VIRTUAL SSL VPN DENIAL OF SERVICE VULNERABILITY

High
Advisory ID:
cisco-sa-asaftdvirtual-dos-MuenGnYR
First Published:
2024 October 23 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCwe44099
CSCwk12738

CVE-2024-20260

CWE-789

CVSS Score:
Base 8.6Click Icon to Copy Verbose Score
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2024-20260

CWE-789

Download CSAF

Email
SUMMARY

* A vulnerability in the VPN and management web servers of the Cisco Adaptive
Security Virtual Appliance (ASAv) and Cisco Secure Firewall Threat Defense
Virtual (FTDv), formerly Cisco Firepower Threat Defense Virtual, platforms
could allow an unauthenticated, remote attacker to cause the virtual devices
to run out of system memory, which could cause SSL VPN connection processing
to slow down and eventually cease all together.

This vulnerability is due to a lack of proper memory management for new
incoming SSL/TLS connections on the virtual platforms. An attacker could
exploit this vulnerability by sending a large number of new incoming SSL/TLS
connections to the targeted virtual platform. A successful exploit could
allow the attacker to deplete system memory, resulting in a denial of service
(DoS) condition. The memory could be reclaimed slowly if the attack traffic
is stopped, but a manual reload may be required to restore operations
quickly.

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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftdvirtual-dos-MuenGnYR

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

* VULNERABLE PRODUCTS

This vulnerability affects Cisco ASAv and FTDv if they have a feature
configured that causes the device to process SSL/TLS messages. These features
include, but are not limited to, the following:
* SSL VPN
* HTTP server used for the management interface

Note: Only the virtual Cisco ASA and FTD platforms are affected by this
vulnerability.

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

DETERMINE WHETHER A DEVICE COULD PROCESS SSL OR TLS MESSAGES

To determine whether a Cisco ASAv or FTDv device could process SSL or TLS
packets, use the show asp table socket | include SSL|DTLS command and verify
that it returns output. If this command returns empty output, the device is
not affected. If this command returns any output, as shown in the following
example, the device is affected:

> asa# show asp table socket | include SSL|DTLS
> SSL 0005aa68 LISTEN x.x.x.x:443 0.0.0.0:*
> SSL 002d9e38 LISTEN x.x.x.x:8443 0.0.0.0:*
> DTLS 0018f7a8 LISTEN 10.0.0.250:443 0.0.0.0:*

Note: Only the virtual Cisco ASA and FTD platforms are affected by this
vulnerability.

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 following
Cisco products:

* Any hardware-based platforms running ASA or FTD Software
* Secure Firewall Management Center (FMC) Software, formerly Firepower
Management Center Software

WORKAROUNDS

* There are no workarounds that address this vulnerability.

FIXED SOFTWARE

* Cisco has released free software updates that address the vulnerability
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.

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.

Only this advisory All Critical and High advisories All advisories Cisco ASA
Software Cisco FMC Software Cisco FTD Software Any Platform 3000 Series
Industrial Security Appliances (ISA) ASA 5500-X Series Firewalls ASA Service
Module Adaptive Security Virtual Appliance (ASAv) Firepower 1000 Series
Firepower 2100 Series Firepower 4100 Series Firepower 9000 Series Firepower
NGFW Virtual Secure Firewall 3100 Series Firepower Management Center
Appliances

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.

ADDITIONAL RESOURCES

For help determining the best Cisco ASA, FTD, or FMC Software release, see
the following Recommended Releases documents. If a security advisory
recommends a later release, Cisco recommends following the advisory guidance.

Cisco ASA Compatibility
Cisco Secure Firewall ASA Upgrade Guide
Cisco Secure Firewall Threat Defense Compatibility 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 vulnerability that is described
in this advisory.

SOURCE

* This vulnerability was found by Vivek Singh 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.

SUBSCRIBE TO CISCO SECURITY NOTIFICATIONS

* Subscribe

RELATED TO THIS ADVISORY

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

URL

* https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftdvirtual-dos-MuenGnYR

REVISION HISTORY

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

Show Less

--------------------------------------------------------------------------------

LEGAL DISCLAIMER

* THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR
MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE
RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.

FEEDBACK

*
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CISCO SECURITY VULNERABILITY POLICY

SUBSCRIBE TO CISCO SECURITY NOTIFICATIONS

* Subscribe

RELATED TO THIS ADVISORY

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

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sec.cloudapps.cisco.com Open in urlscan Pro 72.163.15.141 Public Scan

Form analysis 2 forms found in the DOM

Name: pdfGeneration — POST /security/center/downloadPDF.pdf

GET https://sec.cloudapps.cisco.com/security/center/softwarechecker.x?#~onStep3

Text Content

sec.cloudapps.cisco.com Open in urlscan Pro
72.163.15.141 Public Scan

Form analysis
2 forms found in the DOM