CVE-2019-3644: McAfee Security Bulletin - Updates and product status for HTTP/2 vulnerabilities (CVE-2019-9511, CVE-2019-9512, CVE-2019-9513, CVE-2019-9514, CVE-2019-9515, CVE-2019-9516, CVE-2019-9517, CVE-2019-9518

First Published: September 10, 2019

Impact of Vulnerability:

Denial of Service

CVE ID:

McAfee Linux Operating System (MLOS) NGINX: CVE-2019-9511, CVE-2019-9513, CVE-2019-9516
McAfee Web Gateway (MWG): CVE-2019-3643, CVE-2019-3644

Severity Rating:

CVE-2019-3643: Medium
CVE-2019-3644: High

CVSS v3 Base/Temporal Scores:

CVE-2019-3643: 5.3 / 4.9
CVE-2019-3644: 7.5 / 7.0

Recommendations:

Deploy product updates as they are made available.

Security Bulletin Replacement:

None

Affected Software:

• MLOS - vulnerable version of NGINX
• MWG - protocol scanning
• These products ship with a vulnerable and not exploitable web server:
  • McAfee Active Response Server (MAR)
  • Advanced Threat Defense (ATD)
  • Enterprise Security Manager (ESM) SIEM

Location of updated software:

http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents:

• Vulnerability Description
• McAfee Product Vulnerability Status
• Remediation
• Product Specific Notes
• Frequently Asked Questions (FAQs)
• Resources
• Disclaimer

Vulnerability Description
Multiple McAfee products offer HTTP services or process the HTTP protocol. On August 13, 2019 there was a disclosure of multiple vulnerabilities in the way products had implemented HTTP/2. You can find more information in the Netflix advisory - https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md.

This Security Bulletin describes the McAfee products that are and are not impacted.

• MWG is impacted by CVE-2019-9511 and CVE-2019-9517, addressed through CVE-2019-3643 and CVE-2019-3644 respectively. The scanning proxies support HTTP/2 and have been updated to address these issues.
• MLOS offers NGINX and has updated the NGINX version to 1.16.1. NGINX is vulnerable to CVE-2019-9511, CVE-2019-9513, and CVE-2019-9516. You can find more details about NGINX’s website at: https://www.NGINX.com/blog/NGINX-updates-mitigate-august-2019-http-2-vulnerabilities/.
• A vulnerable version of NGINX is used in MAR Server and ATD. Neither of these products offer HTTP/2 and are not exploitable.
• A vulnerable version of Apache is used in ESM SIEM. SIEM does not offer HTTP/2 and is not exploitable.
• No other products are impacted by the HTTP/2 vulnerabilities.

MWG CVEs:

1. CVE-2019-3643
   McAfee Web Gateway (MWG) earlier than 7.8.2.13 is vulnerable to a remote attacker exploiting CVE-2019-9511, potentially leading to a denial of service. This affects the scanning proxies.
   https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-3643
   https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3643

2. CVE-2019-3644
   McAfee Web Gateway (MWG) earlier than 7.8.2.13 is vulnerable to a remote attacker exploiting CVE-2019-9517, potentially leading to a denial of service. This affects the scanning proxies.
   https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-3644
   https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3644

McAfee Product Vulnerability Status
Investigation into all McAfee products is ongoing. This Security Bulletin will be updated as additional information is available. Not every version of the “Vulnerable and Updated” products are vulnerable. See the Product Specific Notes section below for details. Products not on these lists are being investigated.

Product Status and Remediation Availability

Product

Version

Notes

Vulnerable and Updated

MLOS

3

Available from our public repository: http://mcafeelinux.org/mlos/mlosrepo/3/updates/
See Product Specific Notes

MLOS

2

Available from our public repository: http://mcafeelinux.org/mlos/mlosrepo/2/updates/
See Product Specific Notes

MWG

8.x, 7.8.2.x, 7.7.2.x

Updates released - see the Remediation table

Vulnerable and Not Exploitable

ATD

All versions

ATD ships with a vulnerable version of NGINX. No HTTP/2 functionality is offered.

MAR Server

All versions

MAR ships with a vulnerable version of NGINX. No HTTP/2 functionality is offered.

ESM SIEM

All versions

SIEM ships with a vulnerable version of Apache. No HTTP/2 functionality is offered.

Not Vulnerable

Data Loss Prevention Monitor (DLP Monitor)

11.x, 10.x

Data Loss Prevention Prevent (DLP Prevent)

11.x, 10.x

Data Exchange Layer (DXL) Broker

All versions

ePolicy Orchestrator (ePO)

All versions

McAfee Email Gateway (MEG)

All versions

Network Data Loss Prevention (Network DLP)

9.3

Network Security Manager (NSM)

All versions

Network Security Platform (NSP)

All versions

Network Threat Behavioral Analysis (NTBA)

All versions

Threat Intelligence Exchange (TIE) Server

All versions

For a description of each product, see: https://www.mcafee.com/enterprise/en-us/products/a-z.html.
Remediation
Go to the Product Downloads site, and download the applicable product update/hotfix files:

• ATD, MAR, and SIEM - Future updates will update their web servers.
• MLOS - For customers using the MLOS repository, go directly to the repository and pull the latest updates.
• MWG:
  • Customers using 8.1.x: Update to 8.2.
  • Customers using 7.8.2.x: Update to 7.8.2.13.
  • Customers using 7.7.2.x: Update to 7.7.2.24, and consider updating to 7.8.2.13.

Product

Versions

Type

Earliest Fixed Version

Release Date

MWG

8.1.x
7.8.2.x
7.7.2.x

Update
Update
Update

8.2
7.8.2.13
7.7.2.24

September 10, 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 these documents from the Documentation tab.
Product Specific Notes
MLOS
MLOS ships with NGINX. For customers using MLOS from the public repository, we have updated NGINX to version 1.16.1 to address CVE-2019-9511, CVE-2019-9513, and CVE-2019-9516. MLOS and its components are not affected by CVE-2019-9512, CVE-2019-9514, CVE-2019-9515, CVE-2019-9517, and CVE-2019-9518.
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.

For ePO:

Use the following instructions for ePO:
Check the version and build of ePO that is installed. For information about how to check the version, see: KB52634.

For Appliances:

Use the following instructions for Appliance-based products:

1. Open the Administrator’s User Interface (UI).
2. Click the About link. 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-2019-3643: MWG scanners updated to address CVE-2019-9511

**Base Score**

**5.3**

Attack Vector (AV)

Network (N)

Attack Complexity (AC)

Low (L)

Privileges Required (PR)

None (N)

User Interaction (UI)

None (N)

Scope (S)

Unchanged (U)

Confidentiality (C)

None (N)

Integrity (I)

None (N)

Availability (A)

Low (L)

**Temporal Score (Overall)**

**4.9**

Exploitability (E)

Functional (F)

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=CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C  

2. CVE-2019-3644: MWG scanners updated to address CVE-2019-9517

**Base Score**

**7.5**

Attack Vector (AV)

Network (N)

Attack Complexity (AC)

Low (L)

Privileges Required (PR)

None (N)

User Interaction (UI)

None (N)

Scope (S)

Unchanged (U)

Confidentiality (C)

None (N)

Integrity (I)

None (N)

Availability (A)

High (H)

**Temporal Score (Overall)**

**7.0**

Exploitability (E)

Functional (F)

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=CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:F/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.