Skip to end of metadata
Go to start of metadata

You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 6 Next »

, last updated

This advisory was updated on to document the latest findings about log4j 1.2.17.

The log4j 2.x security issue disclosed in CVE-2021-44228 also affects some components of the Squirro Insight Engine. Squirro includes the following three Java services which all use log4j: Elasticsearch, Zooekeeper, Tika (embedded or as a separate server).

Issue identifier: CVE-2021-44228

Products and Versions: All versions of Squirro Insights Engine

Overview

Since OpenJDK 8u191 the vulnerability seems to not be exploitable (see e.g., Rapid7). The latest Squirro versions ship with the newer 1.8.0_312, and for at least the last three years Squirro has shipped Java runtimes higher than that version.

This document includes the configuration changes required to remediate the security problems. We will update this document when we release patches and version updates that fix the issue out of the box.

We are aware that some of our components (Tika and Zookeeper) include log4j 1.2.17. A separate CVE has been created for that version (CVE-2021-4104) and this version is only vulnerable if their configuration uses the JMSAppender. Squirro’s out-of-the-box configuration does not include this appender anywhere. As a result no immediate action is required for these components.

Solution

The official CVE communication recommends setting the system property log4j2.formatMsgNoLookups=true. Additionally you should check the JDK version.

Elasticsearch

Change Elasticsearch configuration by adding the following line to /etc/elasticsearch/jvm.options:

-Dlog4j2.formatMsgNoLookups=true

Apply the changes by running:

systemctl restart elasticsearch

Tika service

This is an optional component and is usually not yet installed. If the following file does not exist, you can safely assume that the Tika server has not been installed.

Adjust the ExecStart line in /usr/lib/systemd/system/tika.service and change it to include. -Dlog4j2.formatMsgNoLookups=true`. Depending on your Squirro version, this will change the line to:

ExecStart=/usr/bin/java -Dlog4j2.formatMsgNoLookups=true -jar /usr/share/java/tika-server.jar

or

ExecStart=/usr/bin/java -Dlog4j2.formatMsgNoLookups=true -jar /usr/share/java/tika-server.jar --includeStack -c /etc/tika-config.xml

Apply the changes by running the following two commands:

systemctl daemon-reload
systemctl restart tika

JDK

Check the JDK version with the following command:

java -version

If the version given is 1.8.0_121 or newer, the vulnerability should not be exploitable.

Web Application Firewall - WAF

If you have deployed a WAF in your environment, check with your vendor if they already include detection rules for this vulnerability. It may be worth including those rules as well for additional protection.

Support

For any further questions, please don't hesitate to contact us at support@squirro.com or on http://go.squirro.com/support. For security-related communications you can use security@squirro.com.

References

  • No labels