Security Bulletin - Endpoint Security fixes firewall not blocking all Global Threat Intelligence flagged IP addresses vulnerability (CVE-2019-3586)
Security Bulletins ID:
SB10280
Last Modified: 2022-05-04 15:42:19 Etc/GMT
Last Modified: 2022-05-04 15:42:19 Etc/GMT
Summary
First Published: May 14, 2019
Article contents:
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 result 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 aren't 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.
CVE-2019-3586
Protection Mechanism Failure in the Firewall in ENS 10.x prior to 10.6.1 May 2019 Update allows context-dependent attackers to circumvent ENS protection where GTI flagged IP addresses aren't blocked by the ENS Firewall via specially crafted malicious sites where the GTI reputation is carefully manipulated and doesn't correctly trigger the ENS Firewall to block the connection.
NVD CVE-2019-3586
MITRE CVE-2019-3586
Affected Component:
To remediate this issue, install ENS 10.6.1 May 2019 Update.
Go to the Product Downloads site, and download the applicable product update file:
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 Installation Guide for instructions on how to install these updates. All documentation is available at our Product Documentation site.
Acknowledgments
We credit Chris Wynn from London Security for reporting this flaw.
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable or not?
For Endpoint products:
Follow the instructions below for endpoint or client-based products:
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 determine how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website.
When calculating CVSS scores, we adopt 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-2019-3586: ENS Firewall not blocking all GTI flagged IP addresses
NOTE: This CVSS version 3.0 vector is used to generate this score.
Where can I find a list of all Security Bulletins?
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
Disclaimer
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.
| 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 Endpoint Security (ENS) 10.6.1 May 2019 Update. |
| Security Bulletin Replacement | None |
| Affected Software | ENS 10.6.x |
| Location of updated software | Product Downloads site |
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Article contents:
- Vulnerability Description
- Remediation
- Acknowledgments
- Frequently Asked Questions (FAQs)
- Resources
- Disclaimer
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 result 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 aren't 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.
CVE-2019-3586
Protection Mechanism Failure in the Firewall in ENS 10.x prior to 10.6.1 May 2019 Update allows context-dependent attackers to circumvent ENS protection where GTI flagged IP addresses aren't blocked by the ENS Firewall via specially crafted malicious sites where the GTI reputation is carefully manipulated and doesn't correctly trigger the ENS Firewall to block the connection.
NVD CVE-2019-3586
MITRE CVE-2019-3586
Affected Component:
- ENS Firewall
To remediate this issue, install ENS 10.6.1 May 2019 Update.
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 |
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 Installation Guide for instructions on how to install these updates. All documentation is available at our Product Documentation site.
Acknowledgments
We credit Chris Wynn from London Security for reporting this flaw.
Frequently Asked Questions (FAQs)
How do I know if my product is vulnerable or not?
For Endpoint products:
Follow the instructions below for endpoint or client-based products:
- Right-click on 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.
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 determine how critical a vulnerability is and plan accordingly. For more information, visit the CVSS website.
When calculating CVSS scores, we adopt 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-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: This CVSS version 3.0 vector is used to generate this score.
Where can I find a list of all Security Bulletins?
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.
Disclaimer
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.
