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https://issues.apache.org/jira/browse/LOG4J2-3535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17553312#comment-17553312
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Volkan Yazici commented on LOG4J2-3535:
---------------------------------------
Thanks so much for reaching out to us [~PsclKmn]! Would you mind sharing the
_sources_ (not binary!) of either a JUnit test or a single-class Java
application, please?
> Certain strings passed into StrSubstitutor can cause "infinite loop in
> property interpolation"
> ----------------------------------------------------------------------------------------------
>
> Key: LOG4J2-3535
> URL: https://issues.apache.org/jira/browse/LOG4J2-3535
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.17.2
> Reporter: Pascal Koeiman
> Priority: Minor
> Attachments: Crash_e4372c5ba2ed2cdbd5d87cfd541a5bcae60fb274.java,
> crash-e4372c5ba2ed2cdbd5d87cfd541a5bcae60fb274, hhsJazzer.jar, log4j2.xml
>
>
> I believe this is a similar issue to what's listed here, although there it is
> deemed fixed in 2.17.0: https://issues.apache.org/jira/browse/LOG4J2-3230
> Using Code Intelligence's fuzz testing tool
> ([Jazzer|https://github.com/CodeIntelligenceTesting/jazzer]), the exception
> was found by having the tool pass in generated strings to the *replace*
> method of the *StrSubstitutor* class. See also the message below:
> {{== Java Exception: java.lang.IllegalStateException: Infinite loop in
> property interpolation of $\{k:{-}$}ߤ{$\{$k:{-}${$k}߀��$}����:$����$}����-: $k
> at
> org.apache.logging.log4j.core.lookup.StrSubstitutor.checkCyclicSubstitution(StrSubstitutor.java:1087)
> at
> org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:1034)
> at
> org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:1047)
> at
> org.apache.logging.log4j.core.lookup.StrSubstitutor.substitute(StrSubstitutor.java:912)
> at
> org.apache.logging.log4j.core.lookup.StrSubstitutor.replace(StrSubstitutor.java:467)
> at
> org.apache.logging.log4j.core.lookup.StrSubstitutor.replace(StrSubstitutor.java:451)
> at Log4jFuzzer.fuzzerTestOneInput(Log4jFuzzer.java:16)}}
>
> In the attachments I included some files that can be used to try and
> reproduce the issue. The lowercase crash file contains the input that the
> fuzzing tool passed into the method.
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