Synopsis
Important: Elasticsearch and Logstash security updates
Type/Severity
Security Advisory: Important
Topic
An update for Logstash and Elasticsearch is now available for NetEye 4.20 and 4.21.
NetEye Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Description
Elasticsearch is a distributed, RESTful search and analytics engine. Logstash is a dynamic data collection and transformation pipeline with an extensible plugin ecosystem. Both are the core components of the NetEye 4 APM, Log and SIEM modules.
Elasticsearch and Logstash rely on the Log4j2 library for writing their logs.
Apache Log4j2 <=2.14.1 JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled.
Security Fix(es) for NetEye 4.20:
- elasticsearch, elasticsearch-autosetup, elasticsearch-neteye-config, elasticsearch-xpack-license, kibana, kibana-autosetup, kibana-neteye-config, logstash, logstash-autosetup, logstash-neteye-config, logstash-neteye-config-autosetup, filebeat, filebeat-autosetup, filebeat-neteye-config, apm-server, apm-server-neteye-config, apm-server-autosetup, elastic-agent, elastic-agent-neteye-config to version 7.12.1_neteye3.32.8-1.
Security Fix(es) for NetEye 4.21:
- elasticsearch, elasticsearch-autosetup, elasticsearch-neteye-config, elasticsearch-xpack-license, kibana, kibana-autosetup, kibana-neteye-config, logstash, logstash-autosetup, logstash-neteye-config, logstash-neteye-config-autosetup, filebeat, filebeat-autosetup, filebeat-neteye-config, apm-server, apm-server-neteye-config, apm-server-autosetup, elastic-agent, elastic-agent-neteye-config to version 7.15.0_neteye3.35.4-1.
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Solution
For details on how to apply this update, which includes the changes described in this advisory, refer to the NetEye Update Section inside the User Guide.
After installing the updated packages, the elasticsearch and logstash daemons will be restarted automatically.
Mitigation for NetEye versions < 4.20
Add -Dlog4j2.formatMsgNoLookups=true directive to the bottom of both the /neteye/local/elasticsearch/conf/jvm.options and /neteye/shared/logstash/conf/jvm.options files.
Remove the jndiLookup class from the log4j jar package used by logstash by executing the following command:zip -q -d /usr/share/logstash/logstash-core/lib/jars/log4j-core-2.* org/apache/logging/log4j/core/lookup/JndiLookup.class
If you are running a NetEye cluster, ensure you perform these steps on every cluster node.
Finally, restart both the logstash and elasticsearch instances.
Affected Products
All NetEye 4.x versions prior to and including 4.21.
Fixes
- ELASTIC-307 – (CVE-2021-44228) Log4j jndi lookup injection
CVEs
References
- https://access.redhat.com/security/updates/classification/#important
- https://discuss.elastic.co/t/apache-log4j2-remote-code-execution-rce-vulnerability-cve-2021-44228-esa-2021-31/291476
Thomas Forrer
Team Leader Research & Development at Würth Phoenix
Hi folks!
I began loving computer since 1994, it was still the time of windows 3.1. Immediately I learned starting DOS games from the command promt, and while typing some white text on black background I felt like some hackish dude in a hollywoodian movie.
Later during the studies at the university, I discovered the magic world of opensource, and it was love at first sight. Finally I got rid of BSOD's =)
I love everything that is connected to some network, especially in a security perspective.
My motto is:
"With motivation, nothing is impossibile. It only requires more time."
Author
Latest posts by Thomas Forrer
20. 09. 2021
ctf-writeups, SEC4U
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