CVE-2020-7319: McAfee Security Bulletin - Endpoint Security for Windows update fixes four vulnerabilities (CVE-2020-7319, CVE-2020-7320, CVE-2020-7322, and CVE-2020-7323)

First Published: September 8, 2020

Product:

Impacted Versions:

CVE ID:

Impact of Vulnerabilities:

Severity Ratings:

CVSS v3.1
Base/Temporal Scores:

Endpoint Security (ENS)

10.7.0.x
10.6.x
10.5.x

CVE-2020-7319

Improper Access Control (CWE-284)

High

8.8 / 7.9

ENS

10.7.0.x
10.6.x
10.5.x

CVE-2020-7320

Protection Mechanism Failure (CWE-693)

Medium

6.7 / 6.0

ENS

10.7.0.x
10.6.x
10.5.x

CVE-2020-7322

Exposure of Sensitive Information to an Unauthorized Actor (CWE-200)

Medium

4.7 / 4.2

ENS

10.7.0.x
10.6.x
10.5.x

CVE-2020-7323

Authentication Bypass (CWE-288)

Medium

6.9 / 6.2

Recommendations:

Install or update to the latest versions listed in the Remediation section

Security Bulletin Replacement:

None

Location of updated software:

http://www.mcafee.com/us/downloads/downloads.aspx

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:

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

Vulnerability Description

1. CVE-2020-7319
   Improper Access Control vulnerability in McAfee Endpoint Security (ENS) for Windows prior to 10.7.0 September 2020 Update allows local users to access files which the user otherwise would not have access to via manipulating symbolic links to redirect McAfee file operations to an unintended file.
   https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-7319
   https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7319

2. CVE-2020-7320
   Protection Mechanism Failure vulnerability in McAfee Endpoint Security (ENS) for Windows prior to 10.7.0 September 2020 Update allows local administrator to temporarily reduce the detection capability allowing otherwise detected malware to run via stopping certain Microsoft services.
   https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-7320
   https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7320

3. CVE-2020-7322
   Information Disclosure Vulnerability in McAfee Endpoint Security (ENS) for Windows prior to 10.7.0 September 2020 Update allows local users to gain access to sensitive information via incorrectly logging of sensitive information in debug logs.
   https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-7322
   https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7322

4. CVE-2020-7323
   Authentication Protection Bypass vulnerability in McAfee Endpoint Security (ENS) for Windows prior to 10.7.0 September 2020 Update allows physical local users to bypass the Windows lock screen via triggering certain detection events while the computer screen is locked and the McTray.exe is running with elevated privileges. This issue is timing dependent and requires physical access to the machine.
   https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-7323
   https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7323

Remediation
To remediate this issue:

• Customers on earlier ENS 10.7.0 releases: Update to ENS 10.7.0 September 2020 Update.
• Customers on earlier ENS 10.6.1 releases: Update to ENS 10.6.1 September 2020 Update, or upgrade to ENS 10.7.0 September 2020 Update.
• Customers on ENS 10.5.5 releases: Upgrade to ENS 10.6.1 September 2020 Update, or upgrade to ENS 10.7.0 September 2020 Update.

Go to the Product Downloads site and download the applicable product update files:

Product

Version

Type

Release Date

ENS

10.7.0 September 2020 Update

Update

September 8, 2020

ENS

10.6.1 September 2020 Update

Update

September 8, 2020

Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation, updates, and hotfixes. Review the Release Notes and the Installation Guide, which you can download from the Documentation tab, for instructions on how to install these updates.
Acknowledgments
CVE-2020-7319: McAfee credits Jakub Palaczynski (ING Tech Poland) for responsibly reporting this flaw.
CVE-2020-7323: McAfee credits Lockheed Martin Red Team for responsibly reporting this flaw.
Frequently Asked Questions (FAQs)
How do I know if my McAfee product is vulnerable or not?

For Endpoint Security:

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?

1. CVE-2020-7319: Improper Access Control Vulnerability in ENS for Windows

**Base Score**

**8.8**

Attack Vector (AV)

Local (L)

Attack Complexity (AC)

Low (L)

Privileges Required (PR)

Low (L)

User Interaction (UI)

None (N)

Scope (S)

Changed (C)

Confidentiality (C)

High (H)

Integrity (I)

High (H)

Availability (A)

High (H)

**Temporal Score (Overall)**

**7.9**

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-calculator?vector=AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C&version=3.1  

2. CVE-2020-7320: Protection Mechanism Failure in ENS for Windows

**Base Score**

**6.7**

Attack Vector (AV)

Local (L)

Attack Complexity (AC)

High (H)

Privileges Required (PR)

High (H)

User Interaction (UI)

None (N)

Scope (S)

Changed (C)

Confidentiality (C)

Low (L)

Integrity (I)

High (H)

Availability (A)

Low (L)

**Temporal Score (Overall)**

**6.0**

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-calculator?vector=AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:H/A:L/E:P/RL:O/RC:C&version=3.1  

3. CVE-2020-7322: Exposure of Sensitive Information in ENS for Windows

**Base Score**

**4.7**

Attack Vector (AV)

Local (L)

Attack Complexity (AC)

High (H)

Privileges Required (PR)

High (H)

User Interaction (UI)

Required (R)

Scope (S)

Changed (C)

Confidentiality (C)

Low (L)

Integrity (I)

Low (L)

Availability (A)

Low (L)

**Temporal Score (Overall)**

**4.2**

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-calculator?vector=AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L/E:P/RL:O/RC:C&version=3.1  

4. CVE-2020-7323: Authentication Protection Bypass vulnerability in ENS for Windows

**Base Score**

**6.9**

Attack Vector (AV)

Physical (P)

Attack Complexity (AC)

High (H)

Privileges Required (PR)

None (N)

User Interaction (UI)

Required (R)

Scope (S)

Changed (C)

Confidentiality (C)

High (H)

Integrity (I)

High (H)

Availability (A)

Low (L)

**Temporal Score (Overall)**

**6.2**

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-calculator?vector=AV:P/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L/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:

• If you are a registered user, type your User ID and Password, and then click Log In.
• 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.