McAfee Security Bulletin - Endpoint Security fixes firewall not blocking all Global Threat Intelligence flagged IP addresses vulnerability (CVE-2019-3586)
Boletines de seguridad ID:   SB10280
Última modificación:  6/13/2019


First Published: May 14, 2019
 Impact of Vulnerability: Protection Mechanism Failure (CWE-693)
 CVE ID: CVE-2019-3586
 Severity Rating: High
 CVSS v3 Base/Temporal Scores: 7.5 / 6.7
 Recommendations: Install or update to one of the following Endpoint Security (ENS) versions:
  • 10.6.1 May 2019 Update
  • 10.5.5 May 2019 Update
  • 10.5.4 Hotfix 1263641
  • 10.5.3 Hotfix 1263641
 Security Bulletin Replacement: None
 Affected Software: ENS 10.5.x and 10.6.x
 Location of updated software: http://www.mcafee.com/us/downloads/downloads.aspx
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: Vulnerability Description
ENS offers the ability to configure the integrated Firewall to block inbound and outbound access to IP addresses based on the classification returned through a Global Threat Intelligence (GTI) lookup. Some configurations were resulting in the ENS Firewall not correctly blocking connections based on the GTI classification.

To actively exploit this vulnerability, an attacker would have to know which categories of GTI reputations are configured and are not triggering the Firewall block. An attacker would then have to manipulate their GTI reputation to fit one of these categories. The algorithms used to generate the GTI reputation are proprietary.

ENS offers multiple protection and detection mechanisms; one of these mechanisms might detect any malicious activity that results from not blocking the connection.

Protection Mechanism Failure in the Firewall in McAfee Endpoint Security (ENS) 10.x prior to 10.6.1 May 2019 Update allows context-dependent attackers to circumvent ENS protection where GTI flagged IP addresses are not blocked by the ENS Firewall via specially crafted malicious sites where the GTI reputation is carefully manipulated and does not correctly trigger the ENS Firewall to block the connection.

Affected Component:
  • ENS Firewall
To remediate this issue, install the latest update.
  • Users of ENS 10.6.x: Update to the 10.6.1 May 2019 Update.
  • Users of ENS 10.5.5: Update to the 10.5.5 May 2019 Update or 10.6.1 May 2019 Update.
  • Users of ENS 10.5.4: Update to either the 10.6.1 May 2019 Update or 10.5.5 May 2019 Update; otherwise install 10.5.4 Hotfix 1263641.
  • Users of ENS 10.5.3: Update to either the 10.6.1 May 2019 Update or 10.5.5 May 2019 Update; otherwise install 10.5.3 Hotfix 1263641.
Go to the Product Downloads site, and download the applicable product update file:
Product Version Type File Name Release Date
ENS 10.6.1 Update 10.6.1 May 2019 Update May 14, 2019
ENS   10.5.5  Update  10.5.5 May 2019 Update  June 13, 2019
ENS   10.5.4 Hotfix 10.5.4 Hotfix 1263641  June 13, 2019
ENS   10.5.3  Hotfix 10.5.3 Hotfix 1263641   June 11, 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, which you can download from the Documentation tab, for instructions on how to install these updates.
McAfee credits Chris Wynn from London Security for reporting this flaw.
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?

CVE-2019-3586: ENS Firewall not blocking all GTI flagged IP addresses
Base Score 7.5
Attack Vector (AV) Network (N)
Attack Complexity (AC) High (H)
Privileges Required (PR) None (N)
User Interaction (UI) Required (R)
Scope (S) Changed (C)
Confidentiality (C) Low (L)
Integrity (I) Low (L)
Availability (A) High (H) 
Temporal Score (Overall) 6.7
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.

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 of 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.
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.
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.

Calificar este documento

Glosario de términos técnicos

 Resaltar los términos del glosario

Tómese un momento para consultar nuestro Glosario de términos técnicos.