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AUSCERT External Security Bulletin Redistribution
ESB-2021.3131
Security Bulletin - Data Loss Prevention (DLP) Endpoint Windows and DLP
Discover updates fix two vulnerabilities (CVE-2021-31844,
CVE-2021-31845) (SB10368)
16 September 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: DLP Endpoint for Windows
DLP Discover
Publisher: McAfee
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31845 CVE-2021-31844
Original Bulletin:
https://kc.mcafee.com/corporate/index?page=content&id=SB10368
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletins ID : SB10368
Last Modified : 9/14/2021
Summary
First Published: September 14, 2021
+----------------+---------+--------------+-----------------+--------+--------+
| | | | | |CVSS |
| |Impacted | |Impact of |Severity|v3.1 |
|Product: |Versions:|CVE ID: |Vulnerabilities: |Ratings:|Base/ |
| | | | | |Temporal|
| | | | | |Scores: |
+----------------+---------+--------------+-----------------+--------+--------+
|Data Loss | | |CWE-120: Buffer | | |
|Prevention (DLP)|Prior to |CVE-2021-31844|Copy without |High |8.2 / |
|Endpoint for |11.6.200 | |Checking Size of | |7.4 |
|Windows | | |Input | | |
+----------------+---------+--------------+-----------------+--------+--------+
| | | |CWE-120: Buffer | | |
| |Prior to |CVE-2021-31845|Copy without |High |8.4 / |
|DLP Discover |11.6.100 | |Checking Size of | |7.6 |
| | | |Input | | |
+----------------+---------+--------------+-----------------+--------+--------+
| |Install or update to: |
|Recommendations:| |
| | o DLP Endpoint for Windows 11.6.200 |
| | o DLP Discover 11.6.100 |
+----------------+------------------------------------------------------------+
|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 issue impacts both the products in a similar way. Scanning malicious files
can lead to code execution with elevated privileges. In the case of DLP
Endpoint for Windows, this is a local attack as the files are on the same
machine as the agent. For DLP Discover it can be a file on the local machine or
on a machine in the same network as the host of the DLP Discover service. The
CVSS rating is slightly higher for the latter. Publication of this Security
Bulletin was held back until DLP Discover had been remediated as they both rely
on the same Madshi library for content extraction. The fix required code
changes in both products beyond the library, hence the separate CVEs.
1. CVE-2021-31844
A buffer overflow vulnerability in McAfee Data Loss Prevention (DLP)
Endpoint for Windows prior to 11.6.200 allows a local attacker to execute
arbitrary code with elevated privileges through placing carefully
constructed Ami Pro (.sam) files onto the local system and triggering a DLP
Endpoint scan through accessing a file. This is caused by the destination
buffer being of fixed size and incorrect checks being made on the source
size.
NVD CVE-2021-31844
MITRE CVE-2021-31844
2. CVE-2021-31845
A buffer overflow vulnerability in McAfee Data Loss Prevention (DLP)
Discover prior to 11.6.100 allows an attacker in the same network as the
DLP Discover to execute arbitrary code through placing carefully
constructed Ami Pro (.sam) files onto a machine and having DLP Discover
scan it, leading to remote code execution with elevated privileges. This is
caused by the destination buffer being of fixed size and incorrect checks
being made on the source size.
NVD CVE-2021-31845
MITRE CVE-2021-31845
Remediation
To remediate this issue:
o Customers using DLP Endpoint for Windows should update to 11.6.200 or
later.
o Customers using DLP Discover should update to 11.6.100 or later.
Go to the Product Downloads site , and download the applicable product update
file:
+------------------------+--------+------+------------------+
|Product |Version |Type |Release Date |
+------------------------+--------+------+------------------+
|DLP Endpoint for Windows|11.6.200|Update|June 10, 2021 |
+------------------------+--------+------+------------------+
|DLP Discover |11.6.100|Update|September 14, 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 on the Product Documentation site .
Acknowledgments
McAfee Enterprise credits Exodus Intelligence for responsibly reporting this
flaw.
Frequently Asked Questions (FAQs)
How do I know if my 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
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-2021-31844: Local Privilege Escalation in DLP Endpoint 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-2021-31845: Remote Code Execution in DLP Discover
+------------------------+--------------------+
|Base Score |8.4 |
+------------------------+--------------------+
|Attack Vector (AV) |Adjacent (A) |
+------------------------+--------------------+
|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)|7.6 |
+------------------------+--------------------+
|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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