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https://issues.apache.org/jira/browse/LOG4J2-1203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15026301#comment-15026301
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Mitth'raw'nuruodo commented on LOG4J2-1203:
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Never mind; this is taken care of by the built-in {{%enc}}
> Allow filtering of line breaks in layout pattern
> ------------------------------------------------
>
> Key: LOG4J2-1203
> URL: https://issues.apache.org/jira/browse/LOG4J2-1203
> Project: Log4j 2
> Issue Type: New Feature
> Components: Pattern Converters
> Affects Versions: 2.4.1
> Reporter: Mitth'raw'nuruodo
> Priority: Minor
>
> Unless specific steps are taken to filter log inputs, there may be a risk of
> CRLF injection, allowing an attacker to forge log entries:
> https://cwe.mitre.org/data/definitions/93.html
> This is not a critical vulnerability, but manually
> escaping/encoding/sanitising every instance of logging in a large application
> is impractical. Most applications have no need to output un-filtered line
> breaks, so they would benefit from a global option.
> Could the list of pattern converters be extended to include a modifier to say
> that whitespace should be normalised (as per Commons Lang
> {{StringUtils.normaliseSpace}})? Eg {{%_m}}
> Alternatively, it would be simple to implement a wrapper that would apply
> normalisation to the output of another layout, but it would be more difficult
> to configure such a wrapper in XML, and it would affect the entire log
> output, effectively obliterating all padding modifiers.
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