Arbitrary file write in FileUtil#unpackEntries on Windows

In Apache Hadoop, The unTar function uses unTarUsingJava function on Windows and the built-in tar utility on Unix and other OSes. As a result, a TAR entry may create a symlink under the expected extraction directory which points to an external directory. A subsequent TAR entry may extract an arbitrary file into the external directory using the symlink name. This however would be caught by the same targetDirPath check on Unix because of the getCanonicalPath call. However on Windows, getCanonicalPath doesn't resolve symbolic links, which bypasses the check. unpackEntries during TAR extraction follows symbolic links which allows writing outside expected base directory on Windows. This was addressed in Apache Hadoop 3.2.3

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Apache Hadoop 后置链接漏洞

Apache Hadoop是美国阿帕奇（Apache）基金会的一套开源的分布式系统基础架构。该产品能够对大量数据进行分布式处理，并具有高可靠性、高扩展性、高容错性等特点。 Apache Hadoop 存在后置链接漏洞，该漏洞源于 TAR 条目可能会在指向外部目录的预期提取目录下创建符号链接，并使用符号链接名称将任意文件提取到外部目录中。

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