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AUSCERT External Security Bulletin Redistribution
ESB-2021.2407.2
Cisco Adaptive Security Appliance Software Release 9.16.1 and Cisco
Firepower Threat Defense Software Release 7.0.0 IPsec Denial
of Service Vulnerability
19 July 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Adaptive Security Appliance (ASA)
Firepower Threat Defense (FTD)
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1422
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-ipsec-dos-TFKQbgWC
Revision History: July 19 2021: Vendor updated the first fixed release for the ASA platform
July 16 2021: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Adaptive Security Appliance Software Release 9.16.1 and Cisco Firepower
Threat Defense Software Release 7.0.0 IPsec Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-asa-ftd-ipsec-dos-TFKQbgWC
First Published: 2021 July 15 16:00 GMT
Last Updated: 2021 July 16 14:57 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvy66711
CVE Names: CVE-2021-1422
CWEs: CWE-617
Summary
o A vulnerability in the software cryptography module of Cisco Adaptive
Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD)
Software could allow an authenticated, remote attacker or an
unauthenticated attacker in a man-in-the-middle position to cause an
unexpected reload of the device that results in a denial of service (DoS)
condition.
The vulnerability is due to a logic error in how the software cryptography
module handles specific types of decryption errors. An attacker could
exploit this vulnerability by sending malicious packets over an established
IPsec connection. A successful exploit could cause the device to crash,
forcing it to reload. Important : Successful exploitation of this
vulnerability would not cause a compromise of any encrypted data.
Note: This vulnerability affects only Cisco ASA Software Release 9.16.1 and
Cisco FTD Software Release 7.0.0.
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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-ipsec-dos-TFKQbgWC
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
Cisco ASA Software Release 9.16.1 or Cisco FTD Software Release 7.0.0 and
are configured to support IPsec connections to the device.
Firepower 2100 Series
Firepower NGFW Virtual
Adaptive Security Virtual Appliance (ASAv)
Note: These devices are not vulnerable if Federal Information Processing
Standards Publication (FIPS) mode is enabled.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the Device Configuration
The device should be considered vulnerable if either of these configuration
parameters exists on the device:
1. If there is a crypto map bound to an interface in the configuration.
The administrator can issue the show running-config command and check
for the crypto map interface command.
2. If there is a crypto IPsec profile bound to a tunnel interface in the
configuration. The administrator can issue the show running-config
command and check for the tunnel protection ipsec command.
The device is considered not vulnerable if FIPS mode is enabled.
1. For ASA Software, the administrator can issue the show running-config |
include fips-enable command and if the output contains the fips-enable
keyword the device is considered not vulnerable.
2. In Cisco FTD Software, FIPS mode is enabled indirectly by configuring
either Common Criteria (CC) mode or Unified Capabilities Approved
Products List (UCAPL) mode. For further information on determining if
FIPS is configured for Cisco FTD Software, see the Security
Certifications Compliance chapter of the Firepower Management Center
Configuration Guide .
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 Cisco ASA
Software and Cisco FTD Software running on any platform other than the
platforms listed in the Vulnerable Products section.
In addition, Cisco has confirmed that this vulnerability does not affect
Cisco Firepower Management Center (FMC) Software.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
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
This vulnerability is fixed in Cisco ASA Software releases 9.16.1.28 and
later.
This vulnerability is fixed for Cisco Firepower 2100 Series by
Cisco_FTD_SSP_FP2K_Patch-7.0.0.1-15.sh.REL.tar.
This vulnerability is fixed for Cisco Firepower NGFW Virtual by
Cisco_FTD_Patch-7.0.0.1-15.sh.REL.tar.
Note: This vulnerability affects only Cisco ASA Software Release 9.16.1 and
Cisco FTD Software Release 7.0.0.
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 vulnerability that is
described in this advisory.
Source
o This vulnerability was found during the resolution of a Cisco TAC support
case.
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-asa-ftd-ipsec-dos-TFKQbgWC
Revision History
o +---------+-----------------------------+----------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+-----------------------------+----------+--------+-------------+
| | Updated the first fixed | Fixed | | |
| 1.1 | release for the ASA | Software | Final | 2021-JUL-16 |
| | platform. | | | |
+---------+-----------------------------+----------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2021-JUL-15 |
+---------+-----------------------------+----------+--------+-------------+
- --------------------------END INCLUDED TEXT--------------------
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