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<blockquote data-quote="Jonathan Braley" data-source="post: 2511" data-attributes="member: 77"><p>CISA recommends affected entities:</p><ul> <li data-xf-list-type="ul"><strong>Review Apache’s <a href="https://logging.apache.org/log4j/2.x/security.html" target="_blank">Log4j Security Vulnerabilities page</a></strong> for additional information and, if appropriate, apply the provided workaround:</li> </ul> <ul> <li data-xf-list-type="ul">In releases <strong>>=2.10</strong>, this behavior can be mitigated by setting either the system property log4j2.formatMsgNoLookups or the environment variable LOG4J_FORMAT_MSG_NO_LOOKUPS to true.</li> <li data-xf-list-type="ul">For releases from <strong>2.7 through 2.14.</strong>1 all PatternLayout patterns can be modified to specify the message converter as %m{nolookups} instead of just %m.</li> <li data-xf-list-type="ul">For releases from <strong>2.0-beta9 to 2.7, </strong>the only mitigation is to remove the JndiLookup class from the classpath: zip -q -d log4j-core-*.jar org/apache/logging/log4j/core/lookup/JndiLookup.class.</li> </ul> <ul> <li data-xf-list-type="ul"><strong>Apply available patches immediately</strong>. See <a href="https://github.com/cisagov/log4j-affected-db" target="_blank">CISA's GitHub repository</a> for known affected products and patch information.</li> </ul> <ul> <li data-xf-list-type="ul"><strong>Prioritize patching</strong>, starting with mission critical systems, internet-facing systems, and networked servers. Then prioritize patching other affected information technology and operational technology assets. </li> <li data-xf-list-type="ul">Until patches are applied, set log4j2.formatMsgNoLookups to true by adding -Dlog4j2.formatMsgNoLookups=True to the Java Virtual Machine command for starting your application. <strong>Note:</strong> this may impact the behavior of a system’s logging if it relies on Lookups for message formatting. Additionally, this mitigation will only work for versions 2.10 and above. </li> <li data-xf-list-type="ul">As stated above, <a href="https://cyber.dhs.gov/bod/22-01/" target="_blank">BOD 22-01</a> directs federal civilian agencies to mitigate CVE-2021-44228 by December 24, 2021, as part of the <a href="https://www.cisa.gov/known-exploited-vulnerabilities-catalog" target="_blank">Known Exploited Vulnerabilities Catalog</a>.</li> </ul></blockquote><p></p>
[QUOTE="Jonathan Braley, post: 2511, member: 77"] CISA recommends affected entities: [LIST] [*][B]Review Apache’s [URL='https://logging.apache.org/log4j/2.x/security.html']Log4j Security Vulnerabilities page[/URL][/B] for additional information and, if appropriate, apply the provided workaround: [/LIST] [LIST] [*]In releases [B]>=2.10[/B], this behavior can be mitigated by setting either the system property log4j2.formatMsgNoLookups or the environment variable LOG4J_FORMAT_MSG_NO_LOOKUPS to true. [*]For releases from [B]2.7 through 2.14.[/B]1 all PatternLayout patterns can be modified to specify the message converter as %m{nolookups} instead of just %m. [*]For releases from [B]2.0-beta9 to 2.7, [/B]the only mitigation is to remove the JndiLookup class from the classpath: zip -q -d log4j-core-*.jar org/apache/logging/log4j/core/lookup/JndiLookup.class. [/LIST] [LIST] [*][B]Apply available patches immediately[/B]. See [URL='https://github.com/cisagov/log4j-affected-db']CISA's GitHub repository[/URL] for known affected products and patch information. [/LIST] [LIST] [*][B]Prioritize patching[/B], starting with mission critical systems, internet-facing systems, and networked servers. Then prioritize patching other affected information technology and operational technology assets. [*]Until patches are applied, set log4j2.formatMsgNoLookups to true by adding -Dlog4j2.formatMsgNoLookups=True to the Java Virtual Machine command for starting your application. [B]Note:[/B] this may impact the behavior of a system’s logging if it relies on Lookups for message formatting. Additionally, this mitigation will only work for versions 2.10 and above. [*]As stated above, [URL='https://cyber.dhs.gov/bod/22-01/']BOD 22-01[/URL] directs federal civilian agencies to mitigate CVE-2021-44228 by December 24, 2021, as part of the [URL='https://www.cisa.gov/known-exploited-vulnerabilities-catalog']Known Exploited Vulnerabilities Catalog[/URL]. [/LIST] [/QUOTE]
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