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AUSCERT External Security Bulletin Redistribution
ESB-2021.1267
Endpoint Security for Windows update fixes one vulnerability
(CVE-2020-7308) (SB10354)
15 April 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Endpoint Security (ENS) for Windows
Publisher: McAfee
Operating System: Windows
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7308
Original Bulletin:
https://kc.mcafee.com/corporate/index?page=content&id=SB10354
- --------------------------BEGIN INCLUDED TEXT--------------------
McAfee Security Bulletin - Endpoint Security for Windows update fixes one
vulnerability (CVE-2020-7308)
Security Bulletins ID : SB10354
Last Modified : 4/13/2021
Summary
First Published: April 13, 2021
+----------------+-----------+-------------+----------------+--------+--------+
| | | | | |CVSS |
| |Impacted | |Impact of |Severity|v3.1 |
|Product: |Versions: |CVE ID: |Vulnerabilities:|Ratings:|Base/ |
| | | | | |Temporal|
| | | | | |Scores: |
+----------------+-----------+-------------+----------------+--------+--------+
| |10.7.0 | | | | |
| |prior to | |CWE-319: | | |
|Endpoint |February | |Cleartext | | |
|Security (ENS) |2021 Update|CVE-2020-7308|Transmission of |Medium |4.8 / |
|for Windows |10.6.1 | |Sensitive | |4.3 |
| |prior to | |Information | | |
| |February | | | | |
| |2021 Update| | | | |
+----------------+-----------+-------------+----------------+--------+--------+
| |Install or update to: |
|Recommendations:| |
| | o ENS 10.7.0 February 2021 Update |
| | o ENS 10.6.1 February 2021 Update |
+----------------+------------------------------------------------------------+
|Security | |
|Bulletin |None |
|Replacement: | |
+----------------+------------------------------------------------------------+
|Location of | |
|updated |http://www.mcafee.com/us/downloads/downloads.aspx |
|software: | |
+----------------+------------------------------------------------------------+
To receive email notification when this Security Bulletin is updated, click
Subscribe on the right side of the page. You must be logged on to subscribe.
Article contents:
o Vulnerability Description
o Remediation
o Product Specific Notes
o Acknowledgments
o Frequently Asked Questions (FAQs)
o Resources
o Disclaimer
Vulnerability Description
The McAfee Global Threat Intelligence (GTI) over DNS (GTI-DNS) service has been
in production for about 12 years. At the time of its launch, most internet
traffic was not encrypted. GTI-DNS used a fixed key to partially encrypt the
most sensitive information. Since then, we have updated most of our products
and cloud services to use encrypted communication facilities such as TLS. The
latest evolution of our GTI service is GTI-REST. GTI-REST runs only over TLS
1.2 and does not support unauthenticated clients. Our GTI-REST POPs (point of
presence) receive an A rating from SSL Labs.
In the legacy GTI-DNS service, it is possible to snoop DNS traffic and
determine the number of malicious objects on a system. It is also possible to
map known hashes to the encrypted version by examining the A record. An
attacker could also gain control of an intermediate DNS server, or they could
modify the DNS configuration so as to direct DNS requests to a server under
their control. Either of these techniques would enable an attacker to intercept
A record queries and send a spoof response that a malicious file is clean.
Snooping the traffic to see the requests and responses to and from the McAfee
servers is relatively easy to do. But, it is less easy to gain access to a DNS
server and alter the data sent to the client.
It is important to remember that spoofing a clean A record as described above
only has the same effect as when the McAfee product is running on a system that
has no internet connection. Our products use regularly updated local content to
make sure that they continue to offer excellent protection when disconnected
from the internet.
Moreover, if an attacker spoofs an A record to suggest to the product that a
clean file is malicious, the product verifies this response by requesting a
confirmatory TXT record from GTI-DNS. Unlike the A record, the TXT record is
digitally signed. This mechanism prevents attackers from orchestrating a DoS
(denial-of-service) by convicting clean files.
CVE-2020-7308
Cleartext Transmission of Sensitive Information between McAfee Endpoint
Security (ENS) for Windows prior to 10.7.0 February 2021 Update and McAfee
Global Threat Intelligence (GTI) servers using DNS allows a remote attacker to
view the requests from ENS and responses from GTI over DNS. By gaining control
of an intermediate DNS server or altering the network DNS configuration, it is
possible for an attacker to intercept requests and send their own responses.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2020-7308
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2020-7308
Remediation
To remediate this issue:
o Customers on ENS 10.7.0: Update to ENS 10.7.0 February 2021 Update.
o Customers on ENS 10.6.1 and earlier versions: Upgrade to ENS 10.7.0
February 2021 Update, or update to ENS 10.6.1 February 2021 Update.
Once you have installed the update, see the Product Specific Notes section for
the next steps.
Go to the Product Downloads site , and download the applicable product update
file:
+---------------+---------------------------+------+----------------+
|Product |Version |Type |Release Date |
+---------------+---------------------------+------+----------------+
|ENS for Windows|10.7.0 February 2021 Update|Update|February 9, 2021|
| |10.6.1 February 2021 Update| | |
+---------------+---------------------------+------+----------------+
Download and Installation Instructions
For instructions to download McAfee product updates and hotfixes, see: KB56057
- - How to download Enterprise product updates and documentation . Review the
Release Notes and the Installation Guide for instructions on how to install
these updates. All documentation is available at https://docs.mcafee.com .
Product Specific Notes
o This feature is currently offered as an opt-in. Once you have installed the
relevant update, you need to follow the instructions in KB94339 -
REGISTERED - Redirect Endpoint Security AMCore to use REST supported
content to enable the feature.
The referenced article is available only to registered ServicePortal users.
To view registered articles:
1. Log on to the ServicePortal at http://support.mcafee.com .
2. Type the article ID in the search field on the home page.
3. Click Search or press Enter.
o There is a dependency on updated protection content released on or after
April 13, 2021, which has AMCore version 21.2.0.1292.6 (or later).
o McAfee plans to use the GTI-REST API as the default in a future release.
Acknowledgments
McAfee credits the following for responsibly reporting this flaw:
Asaf Nadler from Ben Gurion University of the Negev
Ron Bitton from Ben Gurion University of the Negev
Oleg Brodt from Ben Gurion University of the Negev
Asaf Shabtai from Ben Gurion University of the Negev
Frequently Asked Questions (FAQs)
How do I know if my McAfee product is vulnerable or not
For Endpoint Security on Windows:
Use the following instructions for endpoint or client-based products:
1. Right-click the McAfee tray shield icon on the Windows taskbar.
2. Select McAfee Endpoint Security .
3. In the console, select Action Menu .
4. In the Action Menu, select About . The product version displays.
What is CVSS
CVSS, or Common Vulnerability Scoring System, is the result of the National
Infrastructure Advisory Council's effort to standardize a system of assessing
the criticality of a vulnerability. This system offers an unbiased criticality
score between 0 and 10 that customers can use to judge how critical a
vulnerability is and plan accordingly. For more information, visit the CVSS
website at: https://www.first.org/cvss/ .
When calculating CVSS scores, McAfee has adopted a philosophy that fosters
consistency and repeatability. Our guiding principle for CVSS scoring is to
score the exploit under consideration by itself. We consider only the immediate
and direct impact of the exploit under consideration. We do not factor into a
score any potential follow-on exploits that might be made possible by the
successful exploitation of the issue being scored.
What are the CVSS scoring metrics
CVE-2020-7308: Transmission of data in clear text by ENS
+------------------------+--------------------+
|Base Score |4.8 |
+------------------------+--------------------+
|Attack Vector (AV) |Network (N) |
+------------------------+--------------------+
|Attack Complexity (AC) |High (H) |
+------------------------+--------------------+
|Privileges Required (PR)|None (N) |
+------------------------+--------------------+
|User Interaction (UI) |None (N) |
+------------------------+--------------------+
|Scope (S) |Unchanged (U) |
+------------------------+--------------------+
|Confidentiality (C) |Low (L) |
+------------------------+--------------------+
|Integrity (I) |Low (L) |
+------------------------+--------------------+
|Availability (A) |None (N) |
+------------------------+--------------------+
|Temporal Score (Overall)|4.3 |
+------------------------+--------------------+
|Exploitability (E) |Proof-of-Concept (P)|
+------------------------+--------------------+
|Remediation Level (RL) |Official Fix (O) |
+------------------------+--------------------+
|Report Confidence (RC) |Confirmed (C) |
+------------------------+--------------------+
NOTE: The below CVSS version 3.1 vector was used to generate this score.
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculatorvector=AV:N/AC:H/PR:N/UI:N
/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C&version=3.1
Where can I find a list of all Security Bulletins
All Security Bulletins are published on our external PSIRT website at https://
www.mcafee.com/us/threat-center/product-security-bulletins.aspx . To see
Security Bulletins for McAfee Enterprise products on this website click
Enterprise Security Bulletins . Security Bulletins are retired (removed) once a
product is both End of Sale and End of Support (End of Life).
How do I report a product vulnerability to McAfee
If you have information about a security issue or vulnerability with a McAfee
product, visit the McAfee PSIRT website for instructions at https://
www.mcafee.com/us/threat-center/product-security-bulletins.aspx . To report an
issue, click Report a Security Vulnerability .
How does McAfee respond to this and any other reported security flaws
Our key priority is the security of our customers. If a vulnerability is found
within any McAfee software or services, we work closely with the relevant
security software development team to ensure the rapid and effective
development of a fix and communication plan.
McAfee only publishes Security Bulletins if they include something actionable
such as a workaround, mitigation, version update, or hotfix. Otherwise, we
would simply be informing the hacker community that our products are a target,
putting our customers at greater risk. For products that are updated
automatically, a non-actionable Security Bulletin might be published to
acknowledge the discoverer.
View our PSIRT policy on the McAfee PSIRT website at https://www.mcafee.com/us/
threat-center/product-security-bulletins.aspx by clicking About PSIRT .
Resources
To contact Technical Support, log on to the ServicePortal and go to the Create
a Service Request page at https://support.mcafee.com/ServicePortal/faces/
serviceRequests/createSR :
o If you are a registered user, type your User ID and Password, and then
click Log In .
o If you are not a registered user, click Register and complete the required
fields. Your password and logon instructions will be emailed to you.
Disclaimer
The information provided in this Security Bulletin is provided as is without
warranty of any kind. McAfee disclaims all warranties, either express or
implied, including the warranties of merchantability and fitness for a
particular purpose. In no event shall McAfee or its suppliers be liable for any
damages whatsoever including direct, indirect, incidental, consequential, loss
of business profits or special damages, even if McAfee or its suppliers have
been advised of the possibility of such damages. Some states do not allow the
exclusion or limitation of liability for consequential or incidental damages so
the preceding limitation may not apply.
Any future product release dates mentioned in this Security Bulletin are
intended to outline our general product direction, and they should not be
relied on in making a purchasing decision. The product release dates are for
information purposes only, and may not be incorporated into any contract. The
product release dates are not a commitment, promise, or legal obligation to
deliver any material, code, or functionality. The development, release, and
timing of any features or functionality described for our products remains at
our sole discretion and may be changed or canceled at any time
- --------------------------END INCLUDED TEXT--------------------
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NOTE: This is only the original release of the security bulletin. It may
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===========================================================================
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
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On call after hours for member emergencies only.
===========================================================================
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