Security Bulletin – Data Loss Prevention (DLP) for Windows update fixes one vulnerability (CVE-2023-0400) and updates a third-party library
Security Bulletins ID:
SB10394
Last Modified: 2023-08-09 11:48:56 Etc/GMT
Last Modified: 2023-08-09 11:48:56 Etc/GMT
Summary
First Published: February 1, 2023
Article contents:
Third-Party Library (Advanced Installer):
There was a vulnerability in the Advanced Installer from Caphyon Ltd. used by DLP for Windows.
The attack required an attacker to place a malicious file nameddecoder.dll in a specific temp directory (C:\Windows\Temp\McAfee\McAfee DLP Endpoint\install\ ) and change the permissions so the Administrator and SYSTEM users weren't permitted to remove it.
The DLP for Windows installation process would fail to replace the malicious file with the one it required and would continue the installation process using the malicious file.
This results in the malicious DLL's code being executed with system privileges.
This was addressed in Advanced Installer version 20, which DLP for Windows has been updated to. The vendor provided the following links: IMPORTANT: This vulnerability is only exploitable during the installation of the product.
CVE-2023-0400
The protection bypass vulnerability in DLP for Windows 11.9.x is addressed in version 11.10.0. This vulnerabilty allowed a local user to bypass DLP controls when uploading sensitive data from a mapped drive into a web email client. Loading from a local driver was correctly prevented. Versions prior to version 11.9 correctly detected and blocked the attempted upload of sensitive data. This issue only affects versions 11.9.x. Previous 11.x versions aren't vulnerable. To exploit this vulnerability, the user must have the ability to map a network drive to their local machine.
They also need permission to either access data already on the mapped drive or copy data to the mapped drive.
Remediation
To remediate these issues:
Download and Installation Instructions
For instructions to download product updates and hotfixes, see KB56057 - How to download product updates and documentation.
Review the Release Notes and Installation Guide for instructions about how to install these updates. All documentation is available at our Product Documentation site.
Workaround
For the Advanced Installer issue, if you can't upgrade to the recommended versions, make sure that there are no files inC:\Windows\Temp\McAfee\McAfee DLP Endpoint\install\ before installing DLP for Windows.
Acknowledgments
Trellix credits the Lockhead Martin Red team for responsibly reporting the installation vulnerability to us. We passed the report onto Caphyon Ltd.
CVE-2023-0400: Trellix credits @pinpinsec for responsibly reporting this vulnerability.
Frequently Asked Questions
How do I know if my product is vulnerable or not?
For Endpoint Security (ENS) on Windows:
Use the following instructions for Endpoint or client-based products:
Use the following instructions for Endpoint or client-based products:
Use the following instructions for server-based products:
Use the following instructions for Appliance-based products:
Use the following instructions:
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, which customers can use to determine how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website.
When calculating CVSS scores, we've 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 don't 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?
All Security Bulletins are published on our Knowledge Center. 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 you?
If you have information about a security issue or vulnerability with a product, follow the instructions provided in KB95563 - Report a vulnerability.
How do you 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 of our 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.
We only publish 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.
To view our PSIRT policy, see KB95564 - About PSIRT.
Resources
The information provided in this Security Bulletin is provided as is without warranty of any kind. We disclaim all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall we or our suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if we or our suppliers have been advised of the possibility of such damages. Some states don't 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 shouldn't 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 aren't 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 remain at our sole discretion and may be changed or canceled at any time.
| Product | Impacted Versions | CVE ID | Impact of Vulnerabilities | Severity Ratings | CVSS v3.1 Base/Temporal Scores |
| Data Loss Prevention (DLP) for Windows | 11.9.x | CVE-2023-0400 | CWE-670: Always-Incorrect Control Flow Implementation | Medium | 5.5/5.0 |
| DLP for Windows | 11.9.x and earlier | Advanced Installer Vulnerability (Detailed below) | |||
| Recommendations | Install or upgrade to 11.6.800 or 11.10.0 | ||||
| Security Bulletin Replacement | None | ||||
| Location of Updated Software | Product Downloads site | ||||
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Article contents:
- Vulnerability Description
- Remediation
- Workaround
- Acknowledgments
- Frequently Asked Questions (FAQs)
- Resources
- Disclaimer
Third-Party Library (Advanced Installer):
There was a vulnerability in the Advanced Installer from Caphyon Ltd. used by DLP for Windows.
The attack required an attacker to place a malicious file named
The DLP for Windows installation process would fail to replace the malicious file with the one it required and would continue the installation process using the malicious file.
This results in the malicious DLL's code being executed with system privileges.
This was addressed in Advanced Installer version 20, which DLP for Windows has been updated to. The vendor provided the following links: IMPORTANT: This vulnerability is only exploitable during the installation of the product.
CVE-2023-0400
The protection bypass vulnerability in DLP for Windows 11.9.x is addressed in version 11.10.0. This vulnerabilty allowed a local user to bypass DLP controls when uploading sensitive data from a mapped drive into a web email client. Loading from a local driver was correctly prevented. Versions prior to version 11.9 correctly detected and blocked the attempted upload of sensitive data. This issue only affects versions 11.9.x. Previous 11.x versions aren't vulnerable. To exploit this vulnerability, the user must have the ability to map a network drive to their local machine.
They also need permission to either access data already on the mapped drive or copy data to the mapped drive.
Remediation
To remediate these issues:
- Advanced Installer issue:
Customers should upgrade to version 11.6.800 or 11.10.0 as required. - CVE-2023-0400
Customers on version 11.9.x should upgrade to version 11.10.0.
| Product | Version | Type | Release Date |
| DLP for Windows | 11.6.800 | Minor | August 3, 2023 |
| 11.10.0 | Minor | February 1, 2023 |
Download and Installation Instructions
For instructions to download product updates and hotfixes, see KB56057 - How to download product updates and documentation.
Review the Release Notes and Installation Guide for instructions about how to install these updates. All documentation is available at our Product Documentation site.
Workaround
For the Advanced Installer issue, if you can't upgrade to the recommended versions, make sure that there are no files in
Acknowledgments
Trellix credits the Lockhead Martin Red team for responsibly reporting the installation vulnerability to us. We passed the report onto Caphyon Ltd.
CVE-2023-0400: Trellix credits @pinpinsec for responsibly reporting this vulnerability.
Frequently Asked Questions
How do I know if my product is vulnerable or not?
For Endpoint Security (ENS) on Windows:
Use the following instructions for Endpoint or client-based products:
- Right-click the tray shield icon on the Windows taskbar.
- Select Endpoint Security.
- In the console, select Action Menu.
- In the Action Menu, select About. The product version displays.
Use the following instructions for Endpoint or client-based products:
- Right-click the tray shield icon on the Windows taskbar.
- Select Open Console.
- In the console, select Action Menu.
- In the Action Menu, select Product Details. The product version displays.
Use the following instructions for server-based products:
- Check the version and build of ePO that's installed. For instructions, see KB52634 - How to determine what hotfix is installed for ePO.
- Create a query in ePO for the product version of the product installed within your organization.
Use the following instructions for Appliance-based products:
- Open the Administrator's User Interface (UI).
- Click the About link. The product version displays.
Use the following instructions:
- Log on to the ePO server.
- Click Menu, Data Protection, DLP Policy.
- Inside the DLP console click Help, About. The product version displays.
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, which customers can use to determine how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website.
When calculating CVSS scores, we've 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 don't 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?
- CVE-2023-0400: Protection bypass in Trellix DLP
Base Score 5.5 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) None (N) Integrity (I) High (H) Availability (A) None (N) Temporal Score (Overall) 5.0 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.
All Security Bulletins are published on our Knowledge Center. 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 you?
If you have information about a security issue or vulnerability with a product, follow the instructions provided in KB95563 - Report a vulnerability.
How do you 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 of our 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.
We only publish 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.
To view our PSIRT policy, see KB95564 - About PSIRT.
Resources
To contact Technical Support, go to the Create a Service Request page and log on to the ServicePortal.
- If you are a registered user, type your User ID and Password, and then click Log In.
- If you are not a registered user, click Register and complete the fields to have your password and instructions emailed to you.
The information provided in this Security Bulletin is provided as is without warranty of any kind. We disclaim all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall we or our suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if we or our suppliers have been advised of the possibility of such damages. Some states don't 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 shouldn't 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 aren't 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 remain at our sole discretion and may be changed or canceled at any time.
