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AUSCERT External Security Bulletin Redistribution
ESB-2021.2151
Cisco Email Security Appliance and Cisco Web Security
Appliance Certificate Validation Vulnerability
17 June 2021
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AusCERT Security Bulletin Summary
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Product: Cisco Email Security Appliance (ESA)
Cisco Web Security Appliance (WSA)
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Access Confidential Data — Remote/Unauthenticated
Provide Misleading Information — Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1566
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-wsa-cert-vali-n8L97RW
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Cisco Email Security Appliance and Cisco Web Security Appliance Certificate
Validation Vulnerability
Priority: High
Advisory ID: cisco-sa-esa-wsa-cert-vali-n8L97RW
First Published: 2021 June 16 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvw08342 CSCvw08378
CVE Names: CVE-2021-1566
CWEs: CWE-296
Summary
o A vulnerability in the Cisco Advanced Malware Protection (AMP) for
Endpoints integration of Cisco AsyncOS for Cisco Email Security Appliance
(ESA) and Cisco Web Security Appliance (WSA) could allow an
unauthenticated, remote attacker to intercept traffic between an affected
device and the AMP servers.
This vulnerability is due to improper certificate validation when an
affected device establishes TLS connections. A man-in-the-middle attacker
could exploit this vulnerability by sending a crafted TLS packet to an
affected device. A successful exploit could allow the attacker to spoof a
trusted host and then extract sensitive information or alter certain API
requests.
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-esa-wsa-cert-vali-n8L97RW
Affected Products
o Vulnerable Products
This vulnerability affects Cisco ESA and Cisco WSA if they are running a
vulnerable release of Cisco AsyncOS and are configured to integrate with a
Cisco AMP for Endpoints console.
For information about which Cisco AsyncOS 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 this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Content
Security Management Appliance (SMA).
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
In the following tables, the left column lists Cisco software releases. The
right column indicates whether a release is affected by the vulnerability
described in this advisory and the first release that includes the fix for
this vulnerability. Customers are advised to upgrade to an appropriate
fixed software release as indicated in this section.
Email Security Appliance
Cisco AsyncOS Release First Fixed Release
Earlier than 12.5 Migrate to 12.5.3-035
12.5 12.5.3-035
13.0 13.0.0-030
13.5 13.5.3-010
13.7 Not vulnerable
14.0 and later Not vulnerable
Web Security Appliance
Cisco AsyncOS Release First Fixed Release
Earlier than 11.8 Migrate to 11.8.3-021
11.8 11.8.3-021
12.0 12.0.3-005
12.5 12.5.1-043
14.0 and later Not vulnerable
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 internal security testing.
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-esa-wsa-cert-vali-n8L97RW
Revision History
o +———-+—————————+———-+——–+————–+
| Version | Description | Section | Status | Date |
+———-+—————————+———-+——–+————–+
| 1.0 | Initial public release. | – | Final | 2021-JUN-16 |
+———-+—————————+———-+——–+————–+
– ————————–END INCLUDED TEXT——————–
You have received this e-mail bulletin as a result of your organisation’s
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT’s members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation’s
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author’s website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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