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             AUSCERT External Security Bulletin Redistribution

              Status and updates for OpenSSL vulnerabilities
                       (CVE-2021-3450 and 2021-3449)
                               16 April 2021


        AusCERT Security Bulletin Summary

Product:           McAfee Web Gateway (MWG)
                   McAfee Web Gateway Cloud Service (MWGCS)
Publisher:         McAfee
Operating System:  Network Appliance
Impact/Access:     Denial of Service              -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
                   Access Confidential Data       -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-3450 CVE-2021-3449 

Reference:         ESB-2021.1278

Original Bulletin: 

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McAfee Security Bulletin - Status and updates for OpenSSL vulnerabilities
(CVE-2021-3450 and 2021-3449)

Security Bulletins ID   : SB10356

Last Modified           : 4/14/2021


First Published: April 14, 2021
| CVE Information:                                                            |
| Impact of                | Low - see the Vulnerability Description section  |
| Vulnerabilities:         | below                                            |
|               |          | CVSS  |                       |                  |
| CVE IDs       | Severity | v3.1  | Affected Products     | Impact of        |
|               | Rating   | Base  |                       | Vulnerabilities  |
|               |          | Score |                       |                  |
|               |          |       | See the McAfee        | CWE-295 -        |
| CVE-2021-3450 | High     | 7.4   | Product Vulnerability | Improper         |
|               |          |       | Status table below    | Certificate      |
|               |          |       |                       | Validation       |
|               |          |       | See the McAfee        | CWE-476 - NULL   |
| CVE-2021-3449 | Medium   | 5.9   | Product Vulnerability | Pointer          |
|               |          |       | Status table below    | Dereference      |
| Highest CVSS v3.1 Base   | High                                             |
| Score:                   |                                                  |
| Recommendations:         | Deploy the fixes as they are made available.     |
| Security Bulletin        | None                                             |
| Replacement:             |                                                  |
| Affected Models:         | See the McAfee Product Vulnerability Status      |
|                          | table below for platform details.                |
| Location of updated      | http://www.mcafee.com/us/downloads/              |
| software:                | 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:

  o Vulnerability Description
  o Remediation
  o Frequently Asked Questions (FAQs)
  o Resources
  o Disclaimer

Vulnerability Description
OpenSSL released a security advisory against version 1.1.1 with 1.1.1k
containing the fix. Some McAfee products are using 1.0.2 (with an extended
Support contract) and are not vulnerable.

 1. CVE-2021-3150
    The X509_V_FLAG_X509_STRICT flag enables additional security checks of the
    certificates present in a certificate chain. It is not set by default.
    Starting from OpenSSL version 1.1.1h a check to disallow certificates in
    the chain that have explicitly encoded elliptic curve parameters was added
    as an additional strict check. An error in the implementation of this check
    meant that the result of a previous check to confirm that certificates in
    the chain are valid CA certificates was overwritten. This effectively
    bypasses the check that non-CA certificates must not be able to issue other
    certificates. If a "purpose" has been configured then there is a subsequent
    opportunity for checks that the certificate is a valid CA. All of the named
    "purpose" values implemented in libcrypto perform this check. Therefore,
    where a purpose is set the certificate chain will still be rejected even
    when the strict flag has been used. A purpose is set by default in libssl
    client and server certificate verification routines, but it can be
    overridden or removed by an application. In order to be affected, an
    application must explicitly set the X509_V_FLAG_X509_STRICT verification
    flag and either not set a purpose for the certificate verification or, in
    the case of TLS client or server applications, override the default
    purpose. OpenSSL versions 1.1.1h and newer are affected by this issue.
    Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is
    not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected
 2. CVE-2021-3149
    An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation
    ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello
    omits the signature_algorithms extension (where it was present in the
    initial ClientHello), but includes a signature_algorithms_cert extension
    then a NULL pointer dereference will result, leading to a crash and a
    denial of service attack. A server is only vulnerable if it has TLSv1.2 and
    renegotiation enabled (which is the default configuration). OpenSSL TLS
    clients are not impacted by this issue. All OpenSSL 1.1.1 versions are
    affected by this issue. Users of these versions should upgrade to OpenSSL
    1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL
    1.1.1k (Affected 1.1.1-1.1.1j).

McAfee Product Vulnerability Status
This Security Bulletin will be updated as additional information is available.
|Update Availability                                                          |
|Product                                |Version|CVE-2021-3450 and            |
|                                       |       |CVE-2021-3449                |
|Vulnerable and Updated                                                       |
|McAfee Web Gateway (MWG)               |All    |10.1.1, 9.2.10, 8.2.19       |
|McAfee Web Gateway Cloud Service       |All    |10.1.1, 9.2.10, 8.2.19       |
|(MWGCS)                                |       |                             |
|Not Vulnerable                                                               |
|Advanced Threat Defense (ATD)          |All    |                             |
|Appliance Data Monitor (ADM)           |All    |                             |
|Data Exchange Layer (DXL) Broker       |All    |                             |
|Data Loss Prevention (DLP)             |All    |                             |
|Prevent and Monitor                    |       |                             |
|McAfee Active Response (MAR) Server    |All    |                             |
|Network Security Manager (NSM) Linux   |All    |                             |
|Network Security Platform (NSP)        |All    |                             |
|Network Threat Behavior Analysis (NTBA)|All    |                             |
|SIEM Enterprise Security Manager       |All    |                             |
|Threat Intelligence Exchange (TIE)     |All    |                             |
|Server                                 |       |                             |

For a description of each product, see: https://www.mcafee.com/enterprise/en-us
/products/a-z.html .

To remediate this issue, go to the Product Downloads site , and download the
applicable product update/hotfix file:
|Product|Version|Type  |Release Date  |
|       |10.1.1,|      |              |
|MWG    |9.2.10,|Update|April 14, 2021|
|       |8.2.19 |      |              |
|       |10.1.1,|      |              |
|MWGCS  |9.2.10,|Update|April 14, 2021|
|       |8.2.19 |      |              |

Download and Installation Instructions
For instructions to download McAfee product updates and hotfixes, see: KB56057
- - How to download Enterprise product updates and documentation . Review the
Release Notes and the Installation Guide for instructions on how to install
these updates. All documentation is available at https://docs.mcafee.com .
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 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/server products:
Use the following instructions for server-based products:

  o Check the version and build of ePO that is installed. For instructions,
    see: KB52634 - How to determine what update is installed for ePO .
  o Create a query in ePO for the product version of the product installed
    within your organization.

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.

For DLPe ePO Extension:
Use the following instructions:

 1. Log on to the ePO server.
 2. Click Menu , Data Protection , DLP Policy .
 3. Inside the DLP console click Help , About . 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: https://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.

Where can I find a list of all Security Bulletins
All Security Bulletins are published on our external PSIRT website at https://
www.mcafee.com/us/threat-center/product-security-bulletins.aspx . To see
Security Bulletins for McAfee Enterprise products on this website click
Enterprise 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 https://
www.mcafee.com/us/threat-center/product-security-bulletins.aspx . To report an
issue, click 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 https://www.mcafee.com/us/
threat-center/product-security-bulletins.aspx by clicking 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 :

  o If you are a registered user, type your User ID and Password, and then
    click Log In .
  o 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

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