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AUSCERT External Security Bulletin Redistribution
ESB-2021.1267.2
Endpoint Security for Windows update fixes one vulnerability
(CVE-2020-7308) (SB10354)
22 July 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
Revision History: July 22 2021: Fixed a version typo, changed 10.7.1 to 10.7.0
April 15 2021: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
McAfee Security Bulletin - Endpoint Security for Windows content update fixes
one vulnerability (CVE-2020-7308)
Security Bulletins ID : SB10354
Last Modified : 7/20/2021
Summary
First Published: April 13, 2021
Recent updates to this article
+-------------------+---------------------------------------------------------+
| Date | Update |
+-------------------+---------------------------------------------------------+
| July 20, 2021 | Fixed a version typo, changed 10.7.1 to 10.7.0. |
+-------------------+---------------------------------------------------------+
| | Changed the recommended ENS versions from: |
| | |
| | o ENS 10.7.0 February 2021 Update or later |
| | o ENS 10.6.1 February 2021 Update or later |
| July 9, 2021 | |
| | To: |
| | |
| | o ENS 10.7.0 November 2020 Update or later |
| | ENS 10.6.1 November 2020 Update or later |
+-------------------+---------------------------------------------------------+
| April 22, 2021 | Clarified that AMCore V3 DAT content resolves this |
| | issue. |
+-------------------+---------------------------------------------------------+
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.
+-----------------+----------+-------------+----------------+--------+--------+
| | | | | |CVSS |
| |Impacted | |Impact of |Severity|v3.1 |
|Product: |Versions: |CVE ID: |Vulnerabilities:|Ratings:|Base/ |
| | | | | |Temporal|
| | | | | |Scores: |
+-----------------+----------+-------------+----------------+--------+--------+
|AMCore V3 DAT |AMCore V3 | |CWE-319: | | |
|content with |DAT | |Cleartext | |4.8 / |
|Endpoint Security|content |CVE-2020-7308|Transmission of |Medium |4.3 |
|(ENS) for Windows|4404.x and| |Sensitive | | |
| |prior | |Information | | |
+-----------------+----------+-------------+----------------+--------+--------+
| |Update the AMCore V3 DAT content source to pull from |
| |CommonUpdater3 and install or update to: |
|Recommendations: | |
| | o ENS 10.7.0 November 2020 Update or later |
| | o ENS 10.6.1 November 2020 Update or later |
+-----------------+-----------------------------------------------------------+
|Security Bulletin|None |
|Replacement: | |
+-----------------+-----------------------------------------------------------+
|Location of |http://www.mcafee.com/us/downloads/downloads.aspx |
|updated 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 over DNS (GTI-DNS) service has been in
production for about 12 years, to provide cloud-based reputation services . 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, and map known hashes to
the encrypted version by examining the A record. Or, if an attacker were to
gain control of an intermediate DNS server, they could modify the DNS
configuration to redirect 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 to say 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.
GTI is used as a real-time enhancement to daily DAT content. It is important to
remember that spoofing a clean A record as described above has the same
behavior as systems that don't use GTI (either by configuration or lack of
internet connectivity). These systems are more dependent on our regularly
updated local content to ensure protection. 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 November 2020 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, make sure you are running a version equal to or later
than the ones detailed below:
o Update your configuration to receive content updates from CommonUpdater3
until otherwise notified, and make sure you are using AMCore V3 DAT content
version 4405.1 or later.
o Customers on ENS 10.7.0: Update to ENS 10.7.0 November 2020 Update or
later.
o Customers on ENS 10.6.1 and earlier versions: Upgrade to ENS 10.7.0
November 2020 Update or later, or update to ENS 10.6.1 November 2020 Update
or later.
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 November 2020 Update|Update|November 10, 2020|
| |10.6.1 November 2020 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.
ServicePortal .
:
1. http://support.mcafee.com ServicePortal .
2. ID .
3. Enter .
o There is a dependency on updated AMCore V3 DAT content from CommonUpdater3
released on or after April 13, 2021.
o McAfee plans to use the GTI-REST API as the default in a future content
release. McAfee will send a Support Notification Service (SNS) email once
the change is complete.
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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