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https://issues.apache.org/jira/browse/LOG4J2-1226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15644477#comment-15644477
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Joern Huxhorn commented on LOG4J2-1226:
---------------------------------------
Just checked against 2.5, 2.6 and 2.7. All show the same behavior...
I'm sure I must be missing something...
{code:xml}
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} ---
%msg%n"/>
</Console>
{code}
This is how the console appender is configured.
Even if I do miss something (like an %ex in the pattern layout or something
like that), the current behavior isn't really consistent if you compare
{{debug(String, Object[])}} to {{debug(Message)}} and their respective c'tors.
I'd say that *this* issue is fixed, though.
> Message instances are simply serialized. They mustn't.
> ------------------------------------------------------
>
> Key: LOG4J2-1226
> URL: https://issues.apache.org/jira/browse/LOG4J2-1226
> Project: Log4j 2
> Issue Type: Bug
> Components: API
> Affects Versions: 2.5
> Reporter: Joern Huxhorn
> Assignee: Remko Popma
> Fix For: 2.8
>
>
> Right now, any Message instance used to call any log method are simply sent
> as they are.
> Instead, the {{Throwable}} must be transformed into a {{ThrowableProxy}}.
> Custom {{Message}} implementations must be transformed into one of log4j's
> standard message implementations and care must be taken to convert the
> {{Parameters}} {{Object[]}} into {{String[]}} before the message is
> serialized.
> Otherwise, deserialization will fail if a custom {{Throwable}}, custom
> {{Message}} or custom parameter is not contained in the classpath of the
> application receiving the serialized {{LogEvent}}.
> I found those issues while implementing the circumvention for [Apache Commons
> statement to widespread Java object de-serialisation
> vulnerability|https://blogs.apache.org/foundation/entry/apache_commons_statement_to_widespread]
> in [Lilith|http://lilithapp.com].
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