Mitth'raw'nuruodo created LOG4J2-1203:
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Summary: 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: 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}}
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