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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.2213
              Active Response and MVISION EDR updates fix two
       vulnerabilities (CVE-2020-7341 and CVE-2021-31838) (SB10342)
                               23 June 2021

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           MVISION EDR
                   McAfee Active Response
Publisher:         McAfee
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Increased Privileges            -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-31838 CVE-2020-7341 

Original Bulletin: 
   https://kc.mcafee.com/corporate/index?page=content&id=SB10342

- --------------------------BEGIN INCLUDED TEXT--------------------

Active Response and MVISION EDR updates fix two vulnerabilities (CVE-2020-7341
and CVE-2021-31838) (SB10342)

Security Bulletins ID   : SB10342

Last Modified           : 6/21/2021

Summary

First Published: June 21, 2021
+----------------+---------+--------------+----------------+--------+---------+
|                |         |              |                |        |CVSS v3.1|
|Product:        |Impacted |CVE ID:       |Impact of       |Severity|Base/    |
|                |Versions:|              |Vulnerabilities:|Ratings:|Temporal |
|                |         |              |                |        |Scores:  |
+----------------+---------+--------------+----------------+--------+---------+
|McAfee Active   |Prior to |              |CWE-77 - Command|        |         |
|Response (MAR)  |2.4.4    |CVE-2020-7341 |injection       |High    |8.4 / 7.6|
|                |Hotfix 2 |              |                |        |         |
+----------------+---------+--------------+----------------+--------+---------+
|MVISION EDR     |Prior to |CVE-2021-31838|CWE-77 - Command|High    |8.4 / 7.6|
|                |3.4.0    |              |injection       |        |         |
+----------------+---------+--------------+----------------+--------+---------+
|Recommendations:|Install or update to MAR 2.4.4 Hotfix 2 and MVISION EDR     |
|                |3.4.0.                                                      |
+----------------+------------------------------------------------------------+
|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 Acknowledgments
  o Frequently Asked Questions (FAQs)
  o Resources
  o Disclaimer

Vulnerability Description
MAR and MVISION EDR offer the functionality of executing specific commands when
suspicious activity is detected. It was possible for a MAR or MVISION EDR
administrator, or both, to execute potentially malicious PowerShell commands on
selected machines, which would run as the system user. The result was an
elevation of privileges through command injection.

 1. CVE-2020-7341
    A command injection vulnerability in the Windows client of McAfee Active
    Response (MAR) prior to 2.4.4 HF2 allows an administrator on the MAR server
    to trigger the MAR client to execute arbitrary commands through PowerShell
    using the MAR functionality 'execute reaction'. This works against client
    machines running in the same network.
    https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2020-7341
    https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2020-7341
 2. CVE-2021-31838
    A command injection vulnerability in MVISION EDR (MVEDR) prior to 3.4.0
    allows an authenticated MVEDR administrator to trigger the EDR client to
    execute arbitrary commands through PowerShell using the EDR functionality
    'execute reaction'.
    https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-31838
    https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-31838

Remediation
To remediate these issues:

  o Customers who are using MAR: Update to MAR 2.4.4 Hotfix 2.
  o Customers who are using MVISION EDR: Update to MVISION EDR 3.4.0.

Go to the Product Downloads site , and download the applicable product update/
hotfix file:
+-----------+--------------+------+-------------+
|Product    |Version       |Type  |Release Date |
+-----------+--------------+------+-------------+
|MAR        |2.4.4 Hotfix 2|Hotfix|March 9, 2021|
+-----------+--------------+------+-------------+
|MVISION EDR|3.4.0         |Minor |June 21, 2021|
+-----------+--------------+------+-------------+

Download and Installation Instructions
For instructions, 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 .
Acknowledgments
McAfee credits hoangcuongflp for responsibly reporting these issues.
Frequently Asked Questions (FAQs)
How do I know if my McAfee product is vulnerable or not
For endpoint products:
Use the following instructions for endpoint or client-based products:

 1. Right-click the McAfee tray shield icon on the Windows taskbar.
 2. Select Open Console .
 3. In the console, select Action Menu .
 4. In the Action Menu, select Product Details . The product version displays.

For Appliances:
Use the following instructions for Appliance-based products:

 1. Open the Administrator's User Interface (UI).
 2. Click the About link. 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

 1. CVE-2020-7341: Command injection through environment variable in MAR
    +------------------------+--------------------+
    |Base Score              |8.4                 |
    +------------------------+--------------------+
    |Attack Vector (AV)      |Adjacent Network (A)|
    +------------------------+--------------------+
    |Attack Complexity (AC)  |Low (L)             |
    +------------------------+--------------------+
    |Privileges Required (PR)|High (H)            |
    +------------------------+--------------------+
    |User Interaction (UI)   |None (N)            |
    +------------------------+--------------------+
    |Scope (S)               |Changed (C)         |
    +------------------------+--------------------+
    |Confidentiality (C)     |High (H)            |
    +------------------------+--------------------+
    |Integrity (I)           |High (H)            |
    +------------------------+--------------------+
    |Availability (A)        |High (H)            |
    +------------------------+--------------------+
    |Temporal Score (Overall)|7.6                 |
    +------------------------+--------------------+
    |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:A/AC:L/PR:H/
    UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C&version=3.1
 2. CVE-2021-31838: Command injection through environment variable in MVISION
    EDR
    +------------------------+--------------------+
    |Base Score              |8.4                 |
    +------------------------+--------------------+
    |Attack Vector (AV)      |Adjacent Network (A)|
    +------------------------+--------------------+
    |Attack Complexity (AC)  |Low (L)             |
    +------------------------+--------------------+
    |Privileges Required (PR)|High (H)            |
    +------------------------+--------------------+
    |User Interaction (UI)   |None (N)            |
    +------------------------+--------------------+
    |Scope (S)               |Changed (C)         |
    +------------------------+--------------------+
    |Confidentiality (C)     |High (H)            |
    +------------------------+--------------------+
    |Integrity (I)           |High (H)            |
    +------------------------+--------------------+
    |Availability (A)        |High (H)            |
    +------------------------+--------------------+
    |Temporal Score (Overall)|7.6                 |
    +------------------------+--------------------+
    |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:A/AC:L/PR:H/
    UI:N/S:C/C:H/I:H/A:H/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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===========================================================================
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