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https://issues.apache.org/jira/browse/WW-5184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17611461#comment-17611461
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ASF subversion and git services commented on WW-5184:
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Commit 5338b44c233dbc7a26a5b0c6b0993d770fa5340e in struts's branch
refs/heads/master from Lukasz Lenart
[ https://gitbox.apache.org/repos/asf?p=struts.git;h=5338b44c2 ]
WW-5184 Reduces code complexity when handling excluded/accepted values patterns
> Add optional parameter value check to ParametersInterceptor
> -----------------------------------------------------------
>
> Key: WW-5184
> URL: https://issues.apache.org/jira/browse/WW-5184
> Project: Struts 2
> Issue Type: Improvement
> Affects Versions: 6.0.0
> Reporter: Brian Andle
> Priority: Major
> Fix For: 6.1.0
>
> Time Spent: 6h 50m
> Remaining Estimate: 0h
>
> It is known that developers utilizing Struts/Freemarker should always ensure
> proper sanitization to prevent OGNL/Freemarker evaluation on untrusted user
> input when %{/$\{ in FTL being passed into Struts tags.
> These patterns aren't always practical to resolve/find especially in legacy
> code. This isn't a solely a legacy code issue of course, it's just as easy to
> make a mistake in newer code as well.
> The following would end up rendering 81
> Payload:
> {code:java}
> untrustedInput=%25%7B9%2A9%7D {code}
> FTL:
>
> {code:java}
> <@s.form theme="simple" action="${untrustedInput}" id="myForm4">
> </@s.form> {code}
>
> Java:
> {code:java}
> private String untrustedInput;
> public String getUntrustedInput() {
> return untrustedInput;
> }
> public void setUntrustedInput(String untrustedInput) {
> this.untrustedInput = untrustedInput;
> } {code}
>
> This ticket is to add an optional `params.excludeValuePatterns` so that
> ParametersInterceptor can drop incoming parameter itself if the value matches
> a pattern to be excluded.
>
> {code:java}
> <param
> name="params.excludeValuePatterns">.*\$\{.*?\}.*,.*%\{.*?\}.*</param>{code}
>
> Since this is a pattern and would be executed against the values themselves
> there is the potential of a performance impact however I since it's optional
> we shouldn't see any measurable impact when not enabled.
>
> *NOTE:* I did add a `params.acceptValuePatterns` pattern that is
> null/disabled by default. This might not ever be used but mimic'd the Pattern
> matcher the ParametersInterceptor/CookieInterceptor.
>
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