[jira] [Reopened] (LOG4J2-1203) Allow filtering of line breaks in layout pattern

["Mikael Ståldal (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LOG4J2-1203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mikael Ståldal reopened LOG4J2-1203:
------------------------------------
      Assignee: Mikael Ståldal

> 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
>            Assignee: Mikael Ståldal
>            Priority: Minor
>             Fix For: 2.0-rc2
>
>         Attachments: 0001-LOG4J2-1203-Added-Pattern-encoding-for-CRLF-only.patch
>
>
> 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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