improper validation of certificate with host mismatch in SMTP appender
CVE: CVE-2020-9488
Component: log4j
CWE: CWE-295
Severity: Low
CVSS v3: 3.6/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Release date: 2020-04-25T00:00:00+00:00

Improper validation of certificate with host mismatch in Apache Log4j SMTP appender. This could allow an SMTPS connection to be intercepted by a man-in-the-middle attack which could leak any log messages sent through that appender. Fixed in Apache Log4j 2.12.3 and 2.13.1


Remediation:
Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258
For on-premise installations, before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.

It is recommended to halt the server by stopping the JBoss Application Server process before installing this update; after installing the update, restart the server by starting the JBoss Application Server process.

The References section of this erratum contains a download link (you must log in to download the update).
For on-premise installations, before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.

It is recommended to halt the server by stopping the JBoss Application Server process before installing this update; after installing the update, restart the server by starting the JBoss Application Server process.

The References section of this erratum contains a download link (you must log in to download the update).
Refer to the Data Grid 8.1 Upgrade Guide for instructions on upgrading to this version.

The References section of this erratum contains a download link (you must log in to download the update).
To install this update, do the following:

1. Download the Data Grid 7.3.7 server patch from the customer portal. See the download link in the References section.
2. Back up your existing Data Grid installation. You should back up databases, configuration files, and so on.
3. Install the Data Grid 7.3.7 server patch. Refer to the 7.3 Release Notes for patching instructions.
4. Restart Data Grid to ensure the changes take effect.
Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.

Installation instructions are available from the Fuse 7.10.0 product
documentation page:
https://access.redhat.com/documentation/en-us/red_hat_fuse/7.10/
Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.

Installation instructions are available from the Fuse 7.8.0 product documentation page:
https://access.redhat.com/documentation/en-us/red_hat_fuse/7.8/
Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.

The References section of this erratum contains a download link (you must log in to download the update).
Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.

The References section of this erratum contains a download link (you must log in to download the update).
Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.

The References section of this erratum contains a download link for the update. You must be logged in to download the update.
Previous versions can set the system property mail.smtp.ssl.checkserveridentity to true to globally enable hostname verification for SMTPS connections.