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             AUSCERT External Security Bulletin Redistribution

  Security Bulletin - Drive Encryption 7.3.0 HF2 update fixes DLL Search
         Order Hijacking vulnerability (CVE-2021-31853) (SB10374)
                             11 November 2021


        AusCERT Security Bulletin Summary

Product:           McAfee Drive Encryption (DE)
Publisher:         McAfee
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Increased Privileges            -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-31853  

Original Bulletin: 

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

Security Bulletins ID   : SB10374

Last Modified           : 11/9/2021


First Published: November 9, 2021
|                |         |              |                 |        |CVSS    |
|                |Impacted |              |Impact of        |Severity|v3.1    |
|Product:        |Versions:|CVE ID:       |Vulnerabilities: |Ratings:|Base/   |
|                |         |              |                 |        |Temporal|
|                |         |              |                 |        |Scores: |
|                |         |              |CWE-427:         |        |        |
|Drive Encryption|7.2.x,   |CVE-2021-31853|Uncontrolled     |High    |7.8 /   |
|(DE)            |7.3.x    |              |search path      |        |7.0     |
|                |         |              |element          |        |        |
|Recommendations:|Install or update to MDE 7.3.0 HF2                          |
|Security        |                                                            |
|Bulletin        |None                                                        |
|Replacement:    |                                                            |
|Location of     |                                                            |
|updated         |Product Downloads site                                      |
|software:       |                                                            |

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Article contents:

  o Vulnerability Description
  o Remediation
  o Acknowledgments
  o Frequently Asked Questions (FAQs)
  o Resources
  o Disclaimer

Vulnerability Description
MfeEpeHost.exe is the vulnerable component and is exploited through
manipulation of the PATH environment variable or by placing the malicious DLL
at the right place in the PATH search order.

DLL Search Order Hijacking Vulnerability in McAfee Drive Encryption (MDE) prior
to 7.3.0 HF2 ( allows local users to execute arbitrary code and
escalate privileges via execution from a compromised folder.
NVD CVE-2021-31853
MITRE CVE-2021-31853

To remediate this issue:

  o Customers on MDE 7.3.x should update to 7.3.0 HF2.
  o Customers on MDE 7.2.x should upgrade to 7.3.0 HF2.

Go to the Product Downloads site , and download the applicable product hotfix
|Product|Version    |Type  |File Name        |Release Date    |
|MDE    |7.3.0 HF2  |Hotfix|MDE-|November 9, 2021|
|       |(|      |                 |                |

Download and Installation Instructions
For instructions to download 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 our Product Documentation site .

McAfee Enterprise credits FatRodzianko for responsibly reporting this flaw.

Frequently Asked Questions (FAQs)
How do I know if my 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.

What is CVSS
Common Vulnerability Scoring System (CVSS) 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 .

When calculating CVSS scores, McAfee Enterprise 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 don't 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-2021-31853: MDE DLL Search Order Hijacking vulnerability
|Base Score              |7.8                 |
|Attack Vector (AV)      |Local (L)           |
|Attack Complexity (AC)  |Low (L)             |
|Privileges Required (PR)|Low (L)             |
|User Interaction (UI)   |None (N)            |
|Scope (S)               |Unchanged (U)       |
|Confidentiality (C)     |High (H)            |
|Integrity (I)           |High (H)            |
|Availability (A)        |High (H)            |
|Temporal Score (Overall)|7.0                 |
|Exploitability (E)      |Proof-of-Concept (P)|
|Remediation Level (RL)  |Official Fix (O)    |
|Report Confidence (RC)  |Confirmed (C)       |

NOTE: This CVSS version 3.1 vector was used to generate this score.

Where can I find a list of all Security Bulletins
All Security Bulletins are published on our external PSIRT website . 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 Enterprise
If you have information about a security issue or vulnerability with a McAfee
Enterprise product, go to the PSIRT website , click Report a Security
Vulnerability , and follow the instructions.

How does McAfee Enterprise respond to this and any other reported security
Our key priority is the security of our customers. If a vulnerability is found
within any McAfee Enterprise 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 Enterprise 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 PSIRT website by clicking About PSIRT .

To contact Technical Support, go to the Create a Service Request page and log
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  o If you are a registered user, type your User ID and Password, and then
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  o If you are not a registered user, click Register and complete the fields to
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The information provided in this Security Bulletin is provided as is without
warranty of any kind. McAfee Enterprise disclaims all warranties, either
express or implied, including the warranties of merchantability and fitness for
a particular purpose. In no event shall McAfee Enterprise or its suppliers be
liable for any damages whatsoever including direct, indirect, incidental,
consequential, loss of business profits or special damages, even if McAfee
Enterprise or its suppliers have been advised of the possibility of such
damages. Some states don't 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 shouldn't 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 aren't 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

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