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AUSCERT External Security Bulletin Redistribution
ESB-2021.2059
Security Bulletin - McAfee Agent for Windows update fixes two
vulnerabilities (CVE-2021-31839 and CVE-2021-31840)
10 June 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: McAfee Agent (MA)
Publisher: McAfee
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Modify Arbitrary Files -- Existing Account
Create Arbitrary Files -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31840 CVE-2021-31839
Original Bulletin:
https://kc.mcafee.com/corporate/index?page=content&id=SB10362
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletins ID : SB10362
Last Modified : 6/8/2021
Summary
First Published: June 8, 2021
+----------------+---------+--------------+-----------------+--------+--------+
| | | | | |CVSS |
| |Impacted | |Impact of |Severity|v3.1 |
|Product: |Versions:|CVE ID: |Vulnerabilities: |Ratings:|Base/ |
| | | | | |Temporal|
| | | | | |Scores: |
+----------------+---------+--------------+-----------------+--------+--------+
|McAfee Agent |5.x prior| |CWE-269: Improper| |4.8 / |
|(MA) for Windows|to 5.7.3 |CVE-2021-31839|Privilege |Medium |4.3 |
| | | |Management | | |
+----------------+---------+--------------+-----------------+--------+--------+
| | | |CWE-427: | | |
|MA for Windows |5.x prior|CVE-2021-31840|Uncontrolled |High |7.3 / |
| |to 5.7.3 | |search path | |6.6 |
| | | |element | | |
+----------------+---------+--------------+-----------------+--------+--------+
|Recommendations:|Install or update to MA for Windows 5.7.3 |
+----------------+------------------------------------------------------------+
|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 Frequently Asked Questions (FAQs)
o Resources
o Disclaimer
Vulnerability Description
1. CVE-2021-31839
Improper privilege management vulnerability in McAfee Agent for Windows
prior to 5.7.3 allows a local user to modify event information in the MA
event folder. This allows a local user to either add false events or remove
events from the event logs prior to them being sent to the ePO server.
This folder is intended to be accessible to third-party products which are
integrated with ePO. Permissions have been updated to only allow authorized
third-party products access to this folder.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-31839
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-31839
2. CVE-2021-31840
A vulnerability in the preloading mechanism of specific dynamic link
libraries in McAfee Agent for Windows prior to 5.7.3 could allow an
authenticated, local attacker to perform a DLL preloading attack with
unsigned DLLs. To exploit this vulnerability, the attacker would need to
have valid credentials on the Windows system. This would result in the user
gaining elevated permissions and being able to execute arbitrary code.
The vulnerability is due to insufficient validation of the resources loaded
by the application at run time. An attacker could exploit this
vulnerability by crafting a malicious DLL file and placing it in a specific
location on the targeted system.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-31840
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-31840
Remediation
To remediate this issue, customers using MA for Windows should update to 5.7.3.
Go to the Product Downloads site , and download the applicable product update
file:
+--------------+-------+------+------------+
|Product |Version|Type |Release Date|
+--------------+-------+------+------------+
|MA for Windows|5.7.3 |Update|June 8, 2021|
+--------------+-------+------+------------+
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 .
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 ePO/server products:
Use the following instructions for server-based products:
o Check the version and build of ePO that is installed. For instructions,
see: KB52634 - How to determine what update is installed for ePO .
o Create a query in ePO for the product version of the product installed
within your organization.
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-2021-31839: Incorrect permissions on MA for Windows event folder
+------------------------+--------------------+
|Base Score |4.8 |
+------------------------+--------------------+
|Attack Vector (AV) |Local (L) |
+------------------------+--------------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+--------------------+
|Privileges Required (PR)|Low (L) |
+------------------------+--------------------+
|User Interaction (UI) |Required (R) |
+------------------------+--------------------+
|Scope (S) |Unchanged (U) |
+------------------------+--------------------+
|Confidentiality (C) |Low (L) |
+------------------------+--------------------+
|Integrity (I) |Low (L) |
+------------------------+--------------------+
|Availability (A) |Low (L) |
+------------------------+--------------------+
|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:L/AC:L/PR:L/
UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C&version=3.1
2. CVE-2021-31840: DLL preload vulnerability in MA for Windows
+------------------------+--------------------+
|Base Score |7.3 |
+------------------------+--------------------+
|Attack Vector (AV) |Local (L) |
+------------------------+--------------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+--------------------+
|Privileges Required (PR)|Low (L) |
+------------------------+--------------------+
|User Interaction (UI) |Required (R) |
+------------------------+--------------------+
|Scope (S) |Unchanged (U) |
+------------------------+--------------------+
|Confidentiality (C) |High (H) |
+------------------------+--------------------+
|Integrity (I) |High (H) |
+------------------------+--------------------+
|Availability (A) |High (H) |
+------------------------+--------------------+
|Temporal Score (Overall)|6.6 |
+------------------------+--------------------+
|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:L/AC:L/PR:L/
UI:R/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 :
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
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