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AUSCERT External Security Bulletin Redistribution
ESB-2021.1292
Data Loss Prevention Endpoint for Windows update fixes two
vulnerabilities (CVE-2021-23886 and CVE-2021-23887)
16 April 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: McAfee Data Loss Prevention (DLP) Endpoint for Windows
Publisher: McAfee
Operating System: Windows
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23887 CVE-2021-23886
Original Bulletin:
https://kc.mcafee.com/corporate/index?page=content&id=SB10357
- --------------------------BEGIN INCLUDED TEXT--------------------
McAfee Security Bulletin - Data Loss Prevention Endpoint for Windows update
fixes two vulnerabilities (CVE-2021-23886 and CVE-2021-23887)
Security Bulletins ID : SB10357
Last Modified : 4/14/2021
Summary
First Published: April 14, 2021
+----------------+-----------+--------------+----------------+--------+--------+
| | | | | |CVSS |
| |Impacted | |Impact of |Severity|v3.1 |
|Product: |Versions: |CVE ID: |Vulnerabilities:|Ratings:|Base/ |
| | | | | |Temporal|
| | | | | |Scores: |
+----------------+-----------+--------------+----------------+--------+--------+
|Data Loss | | |CWE-755: | | |
|Prevention (DLP)|Prior to HF| |Improper | |5.5 / |
|Endpoint for |11.6.100.41|CVE-2021-23886|Handling of |Medium |5.0 |
|Windows | | |Exceptional | | |
| | | |Conditions | | |
+----------------+-----------+--------------+----------------+--------+--------+
| | | |CWE-269: | | |
|DLP Endpoint for|Prior to HF|CVE-2021-23887|Privilege |High |7.8 / |
|Windows |11.6.100.41| |escalation | |7.0 |
| | | |vulnerability | | |
+----------------+-----------+--------------+----------------+--------+--------+
|Recommendations:|Install or update DLP Endpoint for Windows to HF 11.6.100.41 |
+----------------+-------------------------------------------------------------+
|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 Acknowledgments
o Frequently Asked Questions (FAQs)
o Resources
o Disclaimer
Vulnerability Description
1. CVE-2021-23886
Denial of Service vulnerability in McAfee Data Loss Prevention (DLP)
Endpoint for Windows prior to 11.6.100 allows a local, low privileged,
attacker to cause a BSoD through suspending a process, modifying the
processes memory and restarting it. This is triggered by the hdlphook
driver reading invalid memory.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23886
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23886
2. CVE-2021-23887
Privilege Escalation vulnerability in McAfee Data Loss Prevention (DLP)
Endpoint for Windows prior to 11.6.100 allows a local, low privileged,
attacker to write to arbitrary controlled kernel addresses. This is
achieved by launching applications, suspending them, modifying the memory
and restarting them when they are monitored by McAfee DLP through the
hdlphook driver.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23887
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23887
Remediation
To remediate this issue, customers should update to DLP Endpoint for Windows HF
11.6.100.41.
Go to the Product Downloads site , and download the applicable product hotfix
file:
+------------------------+--------------+------+--------------+
|Product |Version |Type |Release Date |
+------------------------+--------------+------+--------------+
|DLP Endpoint for Windows|HF 11.6.100.41|Hotfix|April 14, 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 .
Acknowledgments
McAfee credits the following for responsibly reporting these flaws.
CVE-2021-23886 - Assaf Kachlon from Morphisec
CVE-2021-23887 - Andry Diment from Morphisec
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.
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-2021-23886: Denial of Service in DLP Endpoint for Windows
+------------------------+--------------------+
|Base Score |5.5 |
+------------------------+--------------------+
|Attack Vector (AV) |Local (L) |
+------------------------+--------------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+--------------------+
|Privileges Required (PR)|Low (L) |
+------------------------+--------------------+
|User Interaction (UI) |None (N) |
+------------------------+--------------------+
|Scope (S) |Unchanged (U) |
+------------------------+--------------------+
|Confidentiality (C) |None (N) |
+------------------------+--------------------+
|Integrity (I) |None (N) |
+------------------------+--------------------+
|Availability (A) |High (H) |
+------------------------+--------------------+
|Temporal Score (Overall)|5.0 |
+------------------------+--------------------+
|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:L/
UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C&version=3.1
2. CVE-2021-23887: Privilege escalation in DLP Endpoint for Windows
+------------------------+--------------------+
|Base Score |7.8 |
+------------------------+--------------------+
|Attack Vector (AV) |Local (L) |
+------------------------+--------------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+--------------------+
|Privileges Required (PR)|Low (L) |
+------------------------+--------------------+
|User Interaction (UI) |None (N) |
+------------------------+--------------------+
|Scope (S) |Unchanged (U) |
+------------------------+--------------------+
|Confidentiality (C) |High (H) |
+------------------------+--------------------+
|Integrity (I) |High (H) |
+------------------------+--------------------+
|Availability (A) |High (H) |
+------------------------+--------------------+
|Temporal Score (Overall)|7.0 |
+------------------------+--------------------+
|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:L/
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 :
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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