Oracle OpenGrok RCE — CVE-2021–2322

### sets configuration from XML representation [PUT]

+ Request (application/xml)
+ Body
<?xml version="1.0" encoding="UTF-8"?>
<java version="1.8.0_172" class="java.beans.XMLDecoder">
<object class="org.opengrok.indexer.configuration.Configuration" id="Configuration0">
<void property="allowLeadingWildcard">
<boolean>true</boolean>
</void>
</object>
</java>
private static Configuration decodeObject(InputStream in) throws IOException {

final Object ret;

try (XMLDecoder d = new XMLDecoder(new BufferedInputStream(in))) {

ret = d.readObject();

}

if (!(ret instanceof Configuration)) {

throw new IOException("Not a valid config file");

}

return (Configuration) ret;

}
}

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