CVE-2023-43123 Information

Description

On unix-like systems the temporary directory is shared between all user. As such writing to this directory using APIs that do not explicitly set the file/directory permissions can lead to information disclosure. Of note this does not impact modern MacOS Operating Systems.

The method File.createTempFile on unix-like systems creates a file with predefined name (so easily identifiable) and by default will create this file with the permissions -rw-r–r–. Thus if sensitive information is written to this file other local users can read this information.

File.createTempFile(String String) will create a temporary file in the system temporary directory if the ‘java.io.tmpdir’ system property is not explicitly set.

This affects the class  https://github.com/apache/storm/blob/master/storm-core/src/jvm/org/apache/storm/utils/TopologySpoutLag.javaL99  and was introduced by  https://issues.apache.org/jira/browse/STORM-3123

In practice this has a very limited impact as this class is used only if ui.disable.spout.lag.monitoring

is set to false but its value is true by default. Moreover the temporary file gets deleted soon after its creation.

The solution is to use  Files.createTempFile https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/file/Files.htmlcreateTempFile(java.lang.Stringjava.lang.Stringjava.nio.file.attribute.FileAttribute...)  instead.

We recommend that all users upgrade to the latest version of Apache Storm.

Reference

https://lists.apache.org/thread/88oc1vqfjtr29cz5xts0v2wm5pmhbm0l http://www.openwall.com/lists/oss-security/2023/11/23/1