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https://issues.apache.org/jira/browse/SOLR-15846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17457340#comment-17457340
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Michael Schumann commented on SOLR-15846:
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https://logging.apache.org/log4j/2.x/security.html
> High security vulnerability in Log4J - CVE-2021-44228 bundled with Solr
> -----------------------------------------------------------------------
>
> Key: SOLR-15846
> URL: https://issues.apache.org/jira/browse/SOLR-15846
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.4, 8.0, 8.11
> Reporter: Michael Schumann
> Priority: Major
>
> h2. Description
> A flaw was found in the Java logging library Apache Log4j 2 in versions from
> 2.0-beta9 and before and including 2.14.1. This could allow a remote attacker
> to execute code on the server if the system logs an attacker-controlled
> string value with the attacker's JNDI LDAP server lookup.
> h2. Statement
> This issue only affects log4j versions between 2.0 and 2.14.1. In order to
> exploit this flaw you need:
> * A remotely accessible endpoint with any protocol (HTTP, TCP, etc) that
> allows an attacker to send arbitrary data,
> * A log statement in the endpoint that logs the attacker controlled data.
> Due to the existence of JMS Appender which can use JNDI in the log4j 1.x, it
> is possible that log4j version 1.x is also affected by this vulnerability.
> The impact is still under investigation.
> h2. Mitigation
> There are two possible mitigations for this flaw in versions from 2.10 to
> 2.14.1:
> - Set the system property log4j2.formatMsgNoLookups to true, or
> - Remove the JndiLookup class from the classpath. For example: zip -q -d
> log4j-core-*.jar org/apache/logging/log4j/core/lookup/JndiLookup.class`
>
> Another mitigation is to upgrade to version 2.15
>
> +*References:*+
> [https://www.lunasec.io/docs/blog/log4j-zero-day/]
> [https://www.cyberkendra.com/2021/12/worst-log4j-rce-zeroday-dropped-on.html]
> [https://help.aliyun.com/noticelist/articleid/1060971232.html] - Original
> Advisory
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