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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2021.0555
Endpoint Security for Windows update fixes five vulnerabilities
15 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: McAfee Endpoint Security
Publisher: McAfee
Operating System: Windows
Impact/Access: Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23883 CVE-2021-23882 CVE-2021-23881
CVE-2021-23880 CVE-2021-23878
Original Bulletin:
https://kc.mcafee.com/corporate/index?page=content&id=SB10345
- --------------------------BEGIN INCLUDED TEXT--------------------
McAfee Security Bulletin - Endpoint Security for Windows update fixes five
vulnerabilities (CVE-2021-23878, CVE-2021-23880, CVE-2021-23881,
CVE-2021-23882, CVE-2021-23883)
Security Bulletins ID : SB10345
Last Modified : 2/10/2021
Summary
First Published: February 9, 2021
Recent updates to this article
+-------------------+-------------------------------+
| Date | Update |
+-------------------+-------------------------------+
| February 10, 2021 | Fixed a typo in a CVE number. |
+-------------------+-------------------------------+
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.
+----------------+----------+--------------+----------------+--------+--------+
| | | | | |CVSS |
| |Impacted | |Impact of |Severity|v3.1 |
|Product: |Versions: |CVE ID: |Vulnerabilities:|Ratings:|Base/ |
| | | | | |Temporal|
| | | | | |Scores: |
+----------------+----------+--------------+----------------+--------+--------+
| |Prior to | |CWE-312: | | |
| |10.7.0 and| |Cleartext | | |
|Endpoint |10.6.1 |CVE-2021-23878|storage of |High |7.3 / |
|Security (ENS) |February | |sensitive | |6.6 |
| |2021 | |information | | |
| |Update | | | | |
+----------------+----------+--------------+----------------+--------+--------+
| |Prior to | | | | |
| |10.7.0 and| |CWE-269: | | |
|ENS |10.6.1 |CVE-2021-23880|Improper |Medium |6.7 / |
| |February | |Privilege | |6.0 |
| |2021 | |Management | | |
| |Update | | | | |
+----------------+----------+--------------+----------------+--------+--------+
| |Prior to | | | | |
| |10.7.0 and| |CWE-79: Stored | | |
|ENS |10.6.1 |CVE-2021-23881|Cross Site |Medium |4.8 / |
| |February | |Scripting | |4.3 |
| |2021 | | | | |
| |Update | | | | |
+----------------+----------+--------------+----------------+--------+--------+
| |Prior to | | | | |
| |10.7.0 and| |CWE-269: | | |
|ENS |10.6.1 |CVE-2021-23882|Improper |High |8.2 / |
| |February | |Privilege | |7.1 |
| |2021 | |Management | | |
| |Update | | | | |
+----------------+----------+--------------+----------------+--------+--------+
| |Prior to | | | | |
| |10.7.0 and| |CWE-476: NULL | | |
|ENS |10.6.1 |CVE-2021-23883|Pointer |Medium |4.0 / |
| |February | |Dereference | |3.6 |
| |2021 | | | | |
| |Update | | | | |
+----------------+----------+--------------+----------------+--------+--------+
|Recommendations:|Install or update to ENS 10.7.0 and 10.6.1 February 2021 |
| |Update |
+----------------+------------------------------------------------------------+
|Security | |
|Bulletin |None |
|Replacement: | |
+----------------+------------------------------------------------------------+
|Location of | |
|updated |http://www.mcafee.com/us/downloads/downloads.aspx |
|software: | |
+----------------+------------------------------------------------------------+
Article contents:
o Vulnerability Description
o Remediation
o Mitigations
o Acknowledgments
o Frequently Asked Questions (FAQs)
o Resources
o Disclaimer
Vulnerability Description
1. CVE-2021-23878
Clear text storage of sensitive Information in memory vulnerability in
McAfee Endpoint Security (ENS) for Windows prior to 10.7.0 February 2021
Update allows a local user to view ENS settings and credentials via
accessing process memory after the ENS administrator has performed specific
actions.
To exploit this, the local user has to access the relevant memory location
immediately after an ENS administrator has made a configuration change
through the console on their machine.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23878
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23878
2. CVE-2021-23880
Improper Access Control in attribute in McAfee Endpoint Security (ENS) for
Windows prior to 10.7.0 February 2021 Update allows authenticated local
administrator user to perform an uninstallation of the anti-malware engine
via the running of a specific command with the correct parameters.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23880
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23880
3. CVE-2021-23881
A stored cross site scripting vulnerability in ePO extension of McAfee
Endpoint Security (ENS) prior to 10.7.0 February 2021 Update allows an ENS
ePO administrator to add a script to a policy event which will trigger the
script to be run through a browser block page when a local
non-administrator user triggers the policy.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23881
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23881
4. CVE-2021-23882
Improper Access Control vulnerability in McAfee Endpoint Security (ENS) for
Windows prior to 10.7.0 February 2021 Update allows local administrators to
prevent the installation of some ENS files by placing carefully crafted
files where ENS will be installed.
This is only applicable to clean installations of ENS as the Access Control
rules will prevent modification prior to up an upgrade.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23882
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23882
5. CVE-2021-23883
A Null Pointer Dereference vulnerability in McAfee Endpoint Security (ENS)
for Windows prior to 10.7.0 February 2021 Update allows a local
administrator to cause Windows to crash via a specific system call which is
not handled correctly. This varies by machine and had partial protection
prior to this update.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23883
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23883
Remediation
To remediate this issue:
o Customers on ENS 10.7.0: Update to ENS 10.7.0 February 2021 Update.
o Customers on ENS 10.6.1: Upgrade to ENS 10.7.0 February 2021 Update, or
update to ENS 10.6.1 February 2021 Update.
Go to the Product Downloads site , and download the applicable product update
files:
+---------------+---------------------------+------+----------------+
|Product |Version |Type |Release Date |
+---------------+---------------------------+------+----------------+
|ENS for Windows|10.7.0 February 2021 Update|Update|February 9, 2021|
| |10.6.1 February 2021 Update| | |
+---------------+---------------------------+------+----------------+
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 .
Mitigations
McAfee is providing a mitigation solution for CVE-2021-23880. It is as an
alternative for those customers that have ENS 10.7.0/10.6.1 November 2020
Updates or earlier, and can't immediately apply the ENS 10.7.0/10.6.1 February
2021 Updates. The mitigation is to create a custom Expert Rule in ePO that
prevents unauthorized uninstallation of the ENS antimalware engine. For
instructions, see: KB94133 - REGISTERED - Create an Expert Rule that prevents
unauthorized uninstall of the Endpoint Security antimalware engine
(CVE-2021-23880) .
The referenced article is available only to registered ServicePortal users.
To view registered articles:
1. Log on to the ServicePortal at http://support.mcafee.com .
2. Type the article ID in the search field on the home page.
3. Click Search or press Enter.
Acknowledgments
McAfee credits the following for responsibly reporting flaws.
CVE-2021-23878 - Lockheed Martin Red Team
CVE-2021-23883 - Alain Rodel from cirosec GmbH
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.
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-2021-23878: Clear text storage of sensitive Information in ENS
+------------------------+--------------------+
|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
2. CVE-2021-23880: Improper Access Control in the ENS installer
+------------------------+--------------------+
|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 (C) |High (H) |
+------------------------+--------------------+
|Integrity (I) |High (H) |
+------------------------+--------------------+
|Availability (A) |High (H) |
+------------------------+--------------------+
|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-calculatorvector=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
3. CVE-2021-23881: Stored Cross Site Scripting in ENS
+------------------------+--------------------+
|Base Score |4.8 |
+------------------------+--------------------+
|Attack Vector (AV) |Network (N) |
+------------------------+--------------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+--------------------+
|Privileges Required (PR)|High (H) |
+------------------------+--------------------+
|User Interaction (UI) |Required (R) |
+------------------------+--------------------+
|Scope (S) |Changed (C) |
+------------------------+--------------------+
|Confidentiality (C) |Low (L) |
+------------------------+--------------------+
|Integrity (I) |Low (L) |
+------------------------+--------------------+
|Availability (A) |None (N) |
+------------------------+--------------------+
|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:N/AC:L/PR:H/
UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C&version=3.1
4. CVE-2021-23882: Improper Access Control in the ENS installer
+------------------------+--------------------+
|Base Score |8.2 |
+------------------------+--------------------+
|Attack Vector (AV) |Local (L) |
+------------------------+--------------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+--------------------+
|Privileges Required (PR)|High (H) |
+------------------------+--------------------+
|User Interaction (UI) |None (N) |
+------------------------+--------------------+
|Scope (S) |Changed (C) |
+------------------------+--------------------+
|Confidentiality (C) |High (H) |
+------------------------+--------------------+
|Integrity (I) |High (H) |
+------------------------+--------------------+
|Availability (A) |High (H) |
+------------------------+--------------------+
|Temporal Score (Overall)|7.1 |
+------------------------+--------------------+
|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:H/
UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C&version=3.1
5. CVE-2021-23883:
+------------------------+--------------------+
|Base Score |4.0 |
+------------------------+--------------------+
|Attack Vector (AV) |Local (L) |
+------------------------+--------------------+
|Attack Complexity (AC) |High (H) |
+------------------------+--------------------+
|Privileges Required (PR)|High (H) |
+------------------------+--------------------+
|User Interaction (UI) |Required (R) |
+------------------------+--------------------+
|Scope (S) |Unchanged (U) |
+------------------------+--------------------+
|Confidentiality (C) |None (N) |
+------------------------+--------------------+
|Integrity (I) |None (N) |
+------------------------+--------------------+
|Availability (A) |High (H) |
+------------------------+--------------------+
|Temporal Score (Overall)|3.6 |
+------------------------+--------------------+
|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:H/PR:H/
UI:R/S:U/C:N/I:N/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
- --------------------------END INCLUDED TEXT--------------------
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
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===========================================================================
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