Description
In JUnit4 from version 4.7 and before 4.13.1, the test rule TemporaryFolder
contains a local information disclosure vulnerability. On Unix like
systems, the system's temporary directory is shared between all users on
that system. Because of this, when files and directories are written into
this directory they are, by default, readable by other users on that same
system. This vulnerability does not allow other users to overwrite the
contents of these directories or files. This is purely an information
disclosure vulnerability. This vulnerability impacts you if the JUnit tests
write sensitive information, like API keys or passwords, into the temporary
folder, and the JUnit tests execute in an environment where the OS has
other untrusted users. Because certain JDK file system APIs were only added
in JDK 1.7, this this fix is dependent upon the version of the JDK you are
using. For Java 1.7 and higher users: this vulnerability is fixed in
4.13.1. For Java 1.6 and lower users: no patch is available, you must use
the workaround below. If you are unable to patch, or are stuck running on
Java 1.6, specifying the `java.io.tmpdir` system environment variable to a
directory that is exclusively owned by the executing user will fix this
vulnerability. For more information, including an example of vulnerable
code, see the referenced GitHub Security Advisory.