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AUSCERT External Security Bulletin Redistribution
ESB-2021.3200
Security Bulletin - McAfee Agent for Windows update fixes three
vulnerabilities (CVE-2021-31836, CVE-2021-31841, CVE-2021-31847) (SB10369)
23 September 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: McAfee Agent
Publisher: McAfee
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31847 CVE-2021-31841 CVE-2021-31836
Original Bulletin:
https://kc.mcafee.com/corporate/index?page=content&id=SB10369
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletins ID : SB10369
Last Modified : 9/21/2021
Summary
First Published: September 21, 2021
+----------------+---------+--------------+-----------------+--------+--------+
| | | | | |CVSS |
| |Impacted | |Impact of |Severity|v3.1 |
|Product: |Versions:|CVE ID: |Vulnerabilities: |Ratings:|Base/ |
| | | | | |Temporal|
| | | | | |Scores: |
+----------------+---------+--------------+-----------------+--------+--------+
| | | |CWE-269: Improper| | |
| | | |Privilege | | |
|McAfee Agent |Prior to | |Management | |8.2 / |
|(MA) for Windows|5.7.4 |CVE-2021-31847|CWE-347: Improper|High |7.4 |
| | | |Verification of | | |
| | | |Cryptographic | | |
| | | |Signature | | |
+----------------+---------+--------------+-----------------+--------+--------+
| | | |CWE-347: Improper| | |
| | | |Verification of | | |
| |Prior to | |Cryptographic | |8.2 / |
|MA for Windows |5.7.4 |CVE-2021-31841|Signature |High |7.4 |
| | | |CWE-426: | | |
| | | |Untrusted Search | | |
| | | |Path | | |
+----------------+---------+--------------+-----------------+--------+--------+
| |Prior to | |CWE-269: Improper| |5.6 / |
|MA for Windows |5.7.4 |CVE-2021-31836|Privilege |Medium |5.1 |
| | | |Management | | |
+----------------+---------+--------------+-----------------+--------+--------+
|Recommendations:|Install or update to MA 5.7.4 |
+----------------+------------------------------------------------------------+
|Security | |
|Bulletin |None |
|Replacement: | |
+----------------+------------------------------------------------------------+
|Location of | |
|updated |Product Downloads site |
|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
This Security Bulletin covers security fixes for MA on Windows. In all three
issues, the attacker would need to place files on the local machine to exploit
them. The issues are listed in descending order of severity.
1. CVE-2021-31847
Improper access control vulnerability in the repair process for McAfee
Agent for Windows prior to 5.7.4 could allow a local attacker to perform a
DLL preloading attack using unsigned DLLs. This would result in elevation
of privileges and the ability to execute arbitrary code as the system user,
through not correctly protecting a temporary directory used in the repair
process and not checking the DLL signature.
NVD CVE-2021-31847
MITRE CVE-2021-31847
2. CVE-2021-31841
A DLL sideloading vulnerability in McAfee Agent for Windows prior to 5.7.4
could allow a local user to perform a DLL sideloading attack with an
unsigned DLL with a specific name and in a specific location. This would
result in the user gaining elevated permissions and the ability to execute
arbitrary code as the system user, through not checking the DLL signature.
NVD CVE-2021-31841
MITRE CVE-2021-31841
3. CVE-2021-31836
Improper privilege management vulnerability in maconfig for McAfee Agent
for Windows prior to 5.7.4 allows a local user to gain access to sensitive
information. The utility was able to be run from any location on the file
system and by a low privileged user.
NVD CVE-2021-31836
MITRE CVE-2021-31836
Remediation
To remediate this issue, customers should update to MA 5.7.4.
Go to the Product Downloads site , and download the applicable product update
file:
+--------------+-------+------+------------------+
|Product |Version|Type |Release Date |
+--------------+-------+------+------------------+
|MA for Windows|5.7.4 |Update|September 21, 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 .
Acknowledgments
McAfee Enterprise credits the following for responsibly reporting these flaws:
CVE-2021-31847 - @Kharosx0 working with Trend Micro Zero Day Initiative
CVE-2021-31836 - mr.d0x - https://twitter.com/mrd0x
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable or not
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 hotfix is installed for ePO .
o Create a query in ePO for the product version of the product installed
within your organization.
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 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-2021-31847: Improper privilege management in repair process of MA for
Windows
+------------------------+--------------------+
|Base Score |8.2 |
+------------------------+--------------------+
|Attack Vector (AV) |Local (L) |
+------------------------+--------------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+--------------------+
|Privileges Required (PR)|Low (L) |
+------------------------+--------------------+
|User Interaction (UI) |Required (R) |
+------------------------+--------------------+
|Scope (S) |Changed (C) |
+------------------------+--------------------+
|Confidentiality (C) |High (H) |
+------------------------+--------------------+
|Integrity (I) |High (H) |
+------------------------+--------------------+
|Availability (A) |High (H) |
+------------------------+--------------------+
|Temporal Score (Overall)|7.4 |
+------------------------+--------------------+
|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.
2. CVE-2021-31841: DLL side loading vulnerability in MA for Windows
+------------------------+--------------------+
|Base Score |8.2 |
+------------------------+--------------------+
|Attack Vector (AV) |Local (L) |
+------------------------+--------------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+--------------------+
|Privileges Required (PR)|Low (L) |
+------------------------+--------------------+
|User Interaction (UI) |Required (R) |
+------------------------+--------------------+
|Scope (S) |Changed (C) |
+------------------------+--------------------+
|Confidentiality (C) |High (H) |
+------------------------+--------------------+
|Integrity (I) |High (H) |
+------------------------+--------------------+
|Availability (A) |High (H) |
+------------------------+--------------------+
|Temporal Score (Overall)|7.4 |
+------------------------+--------------------+
|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.
3. CVE-2021-31836: Improper Privilege Management in MA for Windows
+------------------------+--------------------+
|Base Score |5.6 |
+------------------------+--------------------+
|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) |Low (L) |
+------------------------+--------------------+
|Availability (A) |None (N) |
+------------------------+--------------------+
|Temporal Score (Overall)|5.1 |
+------------------------+--------------------+
|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
flaws
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 .
Resources
To contact Technical Support, go to the Create a Service Request page and log
on to the ServicePortal.
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 fields to
have your password and instructions emailed to you.
Disclaimer
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 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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