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McAfee Security Bulletin - Data Loss Prevention Endpoint for Windows update fixes two vulnerabilities (CVE-2019-3633 and CVE-2019-3634)
Security Bulletins ID:   SB10295
Last Modified:  9/12/2019

Summary

First Published: August 20, 2019
 
 Impact of Vulnerability: Denial of Service (CWE-730, OWASP 2004:A9)
 CVE ID: CVE-2019-3633
CVE-2019-3634
 Severity Rating: CVE-2019-3633 - Medium
CVE-2019-3634 - Medium
 CVSS v3 Base/Temporal Scores: CVE-2019-3633 - 4.4 / 4.0
CVE-2019-3634 - 4.4 / 4.0
 Recommendations: Update to Data Loss Prevention Endpoint (DLP Endpoint) for Windows 11.3.2.8 or to 11.1.210.3
 Security Bulletin Replacement: None
 Affected Software: DLP Endpoint for Windows:
  • 11.3.x earlier than 11.3.2.8
  • 11.1.x earlier than 11.1.210.3
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents: Vulnerability Description
This Security Bulletin addresses two vulnerabilities in McAfee Data Loss Prevention Endpoint (DLP Endpoint) for Windows. If successful, DLP Endpoint would trigger a sudden halt of the operating system, causing a "blue screen."  To exploit this scenario, an attacker would require a local user to run carefully constructed malicious software which would then pass the malicious message into the DLP Endpoint Agent.
  1. CVE-2019-3633   
    Buffer overflow in McAfee Data Loss Prevention (DLP Endpoint) for Windows 11.x prior to 11.3.2.8 allows a local user to cause the Windows operating system to "blue screen" via a carefully constructed message sent to DLP Endpoint which bypasses DLP Endpoint internal checks and results in DLP Endpoint reading unallocated memory.
    https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-3633  
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3633
     
  2. CVE-2019-3634
    Buffer overflow in McAfee Data Loss Prevention (DLP Endpoint) for Windows 11.x prior to 11.3.2.8 allows a local user to cause the Windows operating system to "blue screen" via an encrypted message sent to DLP Endpoint which when decrypted results in DLP Endpoint reading unallocated memory.
    https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-3634  
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3634
Remediation
To remediate these issues, go to the Product Downloads site, and download the applicable product update file:
  • For DLP Endpoint 11.3.x or earlier, update to 11.3.2.8.

    NOTE: The ePO reported version and DLP Endpoint Console – About version is: 11.3.2.82.
     
  • For DLP Endpoint 11.1.x, upgrade to 11.3.2.8 or update to 11.1.210.3.

    NOTE: The ePO reported version and DLP Endpoint Console – About version is: 11.1.210.32.

NOTE: DLP Endpoint 11.2.x went End of Life at the release of 11.3.0 on July 23, 2019.
 
Product Versions Type Release Date
DLP Endpoint Windows                11.3.2.8 Hotfix August 20, 2019
DLP Endpoint Windows  11.1.210.3 Hotfix August 20, 2019
 
Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation, updates, and hotfixes. Review the Release Notes and the Installation Guide for instructions on how to install these updates.. You can download the documents from the Documentation tab.
Acknowledgments
McAfee credits Liu Jie of Fujitsu Nanda Software Tech (FNST) for reporting these flaws.
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 on 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: http://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-2019-3633: Buffer overflow in DLP Endpoint for Windows
     
    Base Score 4.4
    Attack Vector (AV) Local (L)
    Attack Complexity (AC) High (H)
    Privileges Required (PR) Low (L)
    User Interaction (UI) Required (R)
    Scope (S) Unchanged (U)
    Confidentiality (C) None (N)
    Integrity (I) None (N)
    Availability (A) High (H)
    Temporal Score (Overall) 4.0
    Exploitability (E) Proof-of-Concept (P)
    Remediation Level (RL) Official Fix (O)
    Report Confidence (RC) Confirmed (C)
     
    NOTE: The below CVSS version 3.0 vector was used to generate this score.
    https://nvd.nist.gov/cvss/v3-calculator?vector=AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
     
  2. CVE-2019-3634: Buffer overflow in DLP Endpoint for Windows
     
    Base Score 4.4
    Attack Vector (AV) Local (L)
    Attack Complexity (AC) High (H)
    Privileges Required (PR) Low (L)
    User Interaction (UI) Required (R)
    Scope (S) Unchanged (U)
    Confidentiality (C) None (N)
    Integrity (I) None (N)
    Availability (A) High (H)
    Temporal Score (Overall) 4.0
    Exploitability (E) Proof-of-Concept (P)
    Remediation Level (RL) Official Fix (O)
    Report Confidence (RC) Confirmed (C)
     
    NOTE: The below CVSS version 3.0 vector was used to generate this score.
    https://nvd.nist.gov/cvss/v3-calculator?vector=AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
Where can I find a list of all Security Bulletins?
All Security Bulletins are published on our external PSIRT website at http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx > 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 http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx > 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 http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx > 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:
  • 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 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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