| Description: | Netty is an open-source, asynchronous event-driven network application
framework for rapid development of maintainable high performance
protocol servers & clients. In Netty before version 4.1.59.Final there
is a vulnerability on Unix-like systems involving an insecure temp
file. When netty's multipart decoders are used local information
disclosure can occur via the local system temporary directory if
temporary storing uploads on the disk is enabled. 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 random file, but,
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. This is the case in netty's
"AbstractDiskHttpData" is vulnerable. This has been fixed in version
4.1.59.Final. As a workaround, one may specify your own
"java.io.tmpdir" when you start the JVM or use
"DefaultHttpDataFactory.setBaseDir(...)" to set the directory to
something that is only readable by the current user.
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