CVE-2021-23879: McAfee Security Bulletin - Endpoint Product Removal Tool update fixes a Privilege escalation vulnerability (CVE-2021-23879)

First Published: March 9, 2021

Product:

Impacted Versions:

CVE ID:

Impact of Vulnerabilities:

Severity Ratings:

CVSS v3.1
Base/Temporal Scores:

Endpoint Product Removal (EPR) Tool

Prior to 21.2

CVE-2021-23879

CWE-269: Improper Privilege Management

Medium

6.7 / 6.0

Recommendations:

Download and use the latest EPR Tool version (21.2 as of March 2021). Older versions are automatically expired and should no longer be used.

Security Bulletin Replacement:

None

Location of updated software:

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

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Article contents:

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

Vulnerability Description
CVE-2021-23879
Unquoted service path vulnerability in McAfee Endpoint Product Removal (EPR) Tool prior to 21.2 allows local administrators to execute arbitrary code, with higher-level privileges, via execution from a compromised folder. The tool did not enforce and protect the execution path. Local admin privileges are required to place the files in the required location.
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-23879
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23879
Remediation
To remediate this issue customers should use the latest update.

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

Product

Version

Type

File Name

Release Date

EPR Tool

21.2

Update

McAfeeEndpointProductRemoval_21.2.0.113.exe

February 9, 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 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 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.

For endpoint products and ENS on other platforms:

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 ePO/server products:

Use the following instructions for server-based products:

• Check the version and build of ePO that is installed. For instructions, see KB52634 - How to determine what update is installed for ePO.
• Create a query in ePO for the product version of the product installed within your organization.

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?

CVE-2021-23879: Privilege Escalation via an Unquoted Service Path

Base Score

6.7

Attack Vector (AV)

Local (L)

Attack Complexity (AC)

Low (L)

Privileges Required (PR)

High (H)

User Interaction (UI)

None (N)

Scope (S)

Unchanged (U)

Confidentiality ©

High (H)

Integrity (I)

High (H)

Availability (A)

High (H)

Temporal Score (Overall)

6.0

Exploitability (E)

Proof of Concept §

Remediation Level (RL)

Official Fix (O)

Report Confidence (RC)

Confirmed ©

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:H/UI:N/S:U/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:

• 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.